Recent research shows that jellyfish share surprising similarities with humans, including a sleep pattern of approximately eight hours a day, complemented by short naps. Understanding the sleep behaviors of these marine creatures can shed light on the evolutionary significance of sleep.
“Interestingly, like humans, jellyfish spend about a third of their time sleeping,” states Lior Appelbaum from Bar-Ilan University in Israel.
In animals with brains, such as mammals, sleep is crucial for memory consolidation and the elimination of metabolic waste. However, it remains unclear why sleep evolved in jellyfish, which belong to the brainless cnidarian group and possess neurons arranged in simple networks.
Appelbaum and his team utilized high-resolution cameras to observe Cassiopeia Andromeda, an upside-down jellyfish, in a controlled aquarium environment. The jellyfish were subjected to cycles of light and darkness to replicate natural conditions.
During the simulated daytime, the jellyfish exhibited an average pulse rate of over 37 times per minute, demonstrating responsiveness to sudden stimuli. In contrast, their pulse rate decreased at night, and they became less reactive, indicating a sleep state. These pulsations are vital for nutrient distribution and oxygen supply within the jellyfish’s body, as explained by Appelbaum.
Overall, jellyfish typically sleep for about eight hours each night, interspersed with brief naps lasting one to two hours. Prior studies had confirmed nocturnal sleep in C. Andromeda, but the intricacies of their sleep cycles were previously unknown.
In another experiment, researchers simulated sleep disruption by pulsating water against the jellyfish, which led to even better sleep the following day. “It mirrors human behavior: when sleep-deprived at night, we tend to feel more fatigued during the day,” notes Appelbaum.
Crucially, further examination indicated that sleep in C. Andromeda is associated with reduced DNA damage. Sleep likely protects neurons from deterioration that might occur during wakefulness, as corroborated by the observation that exposing jellyfish to ultraviolet light—thereby increasing DNA damage—resulted in improved sleep patterns.
Future studies are required to determine whether similar sleep benefits apply to other jellyfish species or even mammals. The researchers also found comparable results with starlet sea anemones (Nematostella vectensis), marking a significant step in confirming sleep in these organisms, according to Appelbaum.
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Recent global assessments of the food system reveal that fewer than 1% of individuals consume diets beneficial to both the planet and human health.
Nevertheless, adopting a healthier dietary approach could prevent up to 15 million premature deaths annually and could decrease global greenhouse gas emissions by as much as 20%.
The findings are part of a 2025 Report by the Eat-Lancet Committee, which consolidates insights from nutritionists, climate experts, economists, physicians, social scientists, and agricultural scholars from over 35 countries.
The research team evaluated the effects of current food systems on human health and the environment, concluding that food production poses risks to five crucial Earth systems that are essential for human survival.
These five critical threats include climate change, land degradation, water scarcity, nitrogen and phosphorus pollution, and human-induced contaminants like pesticides and microplastics.
However, transforming the food system to ensure healthy diets for everyone could restore these systems to a safe state and enhance human well-being.
“If everyone adopts a healthy diet, by 2050, 100 billion people could sustain themselves on 7% less land than what is currently utilized,” stated Dr. Fabrice Declerck, EAT’s Chief Science Officer, in an interview with BBC Science Focus. “This has never happened in the history of food production. We have very few resources needed to feed more individuals.”
Justice was a significant aspect of the report, emphasizing the need for equitable wages for food workers and fairer access to food resources – Credit: Anuchasiribisanwan via Getty
Scientists have estimated that 6.9 billion individuals consume excessive amounts of food, particularly meat, dairy, sugar, and ultra-processed items, while 3.7 billion struggle to find access to nutritious food.
As a result, the report advocates for adherence to a planetary health diet (PhD), which emphasizes fruits, vegetables, nuts, legumes, and whole grains.
In a PhD, half of your plate should consist of vegetables, fruits, and nuts, while 30% should be dedicated to whole grains. The remaining portion should be a protein source, with a focus on legumes like beans and lentils.
Meat, fish, and dairy are optional within the PhD framework, with established limits, but the diet allows for flexibility. For instance, one can remain within guidelines even with a weekly intake of up to 200g of beef.
Declerck notes that the diet is adaptable to individual tastes, encouraging people to incorporate their cultural preferences.
“In fact, I believe traditional diets often more accurately reflect health,” he mentioned.
The planet’s healthy food guidelines aim to enhance human health while also benefiting the environment, as stated in the report – Credit: Carl Hendon
Currently, only 1% of individuals meet the report’s dietary suggestions. Declerck emphasized that scientists are not ready to pinpoint the locations of these individuals, given the numerous variations among countries.
“But these individuals reside in societies where they can access healthy diets and earn a livable wage,” he added.
Declerck further remarked that the best examples of healthy eating are often found in middle-income countries, particularly within the Mediterranean basin, the Indian subcontinent, and Southeast Asia.
For middle-income nations, the challenge lies in avoiding a shift toward a Western diet while maintaining cultural dietary traditions.
Amidst concerns regarding the climate crisis, Declerck stated that the report presents a “surprising” opportunity to enhance both human health and environmental well-being simultaneously.
“We encourage individuals to consume a wider variety of foods, celebrate their own cultural contributions, explore diverse culinary traditions, and enjoy the richness of food diversity,” he asserted. “This is beneficial not only for your personal health but also contributes significantly to the health of our planet as a whole,” Declerck concluded.
The research’s co-author, Professor Johann Lockstrom, co-chair of the committee and director of the Potsdam Institute for Climate Impact Research, stated: “The evidence is irrefutable. It is not only feasible to transform the food system, but it is crucial for ensuring a safe, fair, and sustainable future for all.”
Justice formed another key component of the report, highlighting the fact that the wealthiest 30% of the population accounts for over 70% of food-related environmental impacts.
“Those of us who are unhealthy and walk blocking others’ rights to a secure environment must take action,” the report emphasized.
The findings call for immediate measures to reform the global food system for the benefit of human health, justice, and environmental sustainability.
Individuals who indulge in beer, practice poor hygiene, share beds, and skip sunscreen could be more attractive to mosquitoes, according to a study focused on festival attendees.
In their investigation of mosquito attraction, Sarah Lynn Blanken from Radboud University Medical Center in the Netherlands, along with her team, attended the 2023 Lowlands Festival near Amsterdam. They surveyed 465 festivalgoers on their health habits, dietary choices, hygiene practices, sunscreen usage, substance consumption, blood type, and whether they had slept alone the previous night.
The researchers established a makeshift lab inside a shipping container with mosquitoes that had previously survived 1,700 prisoners of war (Anopheles Stephensi), which are capable of transmitting malaria.
While the mosquitoes sought to land on the participants, they couldn’t actually bite; 20-35 of the insects were placed in transparent plastic containers with perforated dividers to separate the arms of the participants from the mosquitoes.
The team recorded the number of times mosquitoes attempted to land on the arms of the festivalgoers for three minutes, comparing this to cotton pad decoys soaked in glucose.
“Mosquitoes showed a clear preference for individuals consuming hops and grapes, indicating a preference for well-hydrated bodies,” the researchers noted. “Those who drank beer experienced significantly more landings compared to individuals who were sober for at least 12 hours.”
Blanken highlighted, however, that this doesn’t mean she’s extending her beer consumption. “I just rely on long sleeves and insect repellent,” she stated.
The study also indicated that “participants who had companions in their tents the previous night seemed to attract more mosquitoes.” Sunscreen appeared to deter mosquitoes, likely by masking the scent of the skin or acting as a repellent. No evidence was found to suggest that different blood types influenced mosquito attraction or repulsion.
“Our findings indicate that mosquitoes were drawn to individuals who skimped on sunscreen, indulged in beer, and shared beds,” the team concluded. “They have a clear hedonistic preference among us.”
Festival participants place their arms in a partition where mosquitoes can try to land on them, but not actually do it
Roland Festival/National Wetenschapsagenda Netherlands
Cameron Webb from the University of Sydney mentioned that although it was an entertaining study, it involved only one species of mosquito, meaning the findings may not apply to others.
The researchers discovered that only four participants did not attract mosquitoes. “The key takeaway is that nearly all participants were alluring to mosquitoes seeking a blood meal, regardless of other variables,” Webb noted. “The reality is, as long as we focus on mosquito repellents and ponder why mosquitoes bite, we will still get bitten and increase our chances of encountering mosquito-borne diseases.”
The bed nuclei of the stria terminalis comprise a larger, banded structure in the brain known as the stria terminalis.
My Box/Alamy
Brain regions that influence food intake may eventually be targeted to enhance weight loss or therapeutic interventions.
Studies indicate that activating neurons in this specific brain region leads to increased food intake in mice, particularly when consuming sunflower seed-sized food items. However, the impact of taste on neuronal activity remained ambiguous.
For deeper insights, refer to Charles Zuker from Columbia University, who, along with his team, conducted brain imaging on mice. Earlier research linked sweet taste neuron activity in the amygdala with the enjoyment of sweet substances.
These neurons stimulate other neurons in the BNST, sometimes referred to as the “expanded amygdala.” This marks the first evidence of taste signal reception by this brain structure, according to Haijiang Cai from the University of Arizona, who was not part of the study.
The researchers aimed to determine whether these activated BNST neurons influence dietary choices, so they genetically modified cells to prevent activation when mice tasted sweet substances. Over a 10-minute period, these modified mice exhibited significantly reduced consumption compared to their normal counterparts, indicating that BNST neuron activation encourages sweet taste consumption.
Interestingly, the researchers also discovered that this artificial activation led mice to consume more water and even seek out salty or bitter substances, which they typically avoid.
Further experiments indicated that more BNST neurons were activated by sweet and salty tastes in hungry or salt-depleted mice, suggesting that the BNST integrates taste signals along with nutrient deficiency cues to regulate food intake, according to Cai.
Given the similarities between human and mouse BNST, these findings are relevant for humans, says Cai. They suggest that developing drugs to activate BNST neurons could aid individuals experiencing severe appetite loss, like those undergoing cancer treatment.
Cai mentioned that numerous brain pathways regulate food intake, and some may compensate for long-term changes in BNST activity induced by drugs. Therefore, targeting multiple feeding circuits would likely be necessary.
This research also has implications for improving results from weight loss treatments, including the GLP-1 drug semaglutide. This drug binds to neurons in the BNST, and a clearer understanding of its effects on food consumption could enhance the effectiveness of such medications, according to Sarah Stern from the Max Planck Florida Institute for Neuroscience.
What role does YouTube play in the lives of Australian families with children? As the federal government considers extending bans on social media accounts for minors under 16 to include YouTube, readers of the Guardian shared insights about their kids’ engagement with the platform and their opinions on the proposed ban.
Here’s what they had to say.
“Monitoring it simply isn’t feasible.”
Many parents reported making efforts to limit their children’s usage to shared spaces, often opting for co-viewing or utilizing parental controls. Nevertheless, many expressed concerns that this approach is time-intensive and nearly unmanageable, leaving them anxious about content that may go undetected.
“We rely on YouTube Kids and always monitor what they view beforehand. YouTube doesn’t seem to trust us, so we take these precautions. The algorithm is extremely fast, and we fear they may fall into endless rabbit holes.
“The primary reason we impose restrictions is due to my own adult experiences on YouTube. I feel like I have to fight the algorithms that lead me toward content I don’t want to see. After watching one Gel Blaster video, I suddenly had 100 videos of Americans shooting guns. One gym bodybuilder video led me to a flood of fitness models. If I have to struggle this hard, YouTube does the same to my kids.” Marty, father of two under nine, Brisbane
“Prior to deleting it, our kids would spend hours on YouTube. They easily get caught in a satisfying loop, jumping from one video to the next.
“I enjoy watching some videos with my kids. Some are educational and quite humorous. However, it’s ultimately challenging to regulate and filter content sufficiently, to ensure they aren’t exposed to anything inappropriate. We have three boys, and many videos have explicit messages that could negatively affect young boys’ perceptions of women.” Adelaide, parents of three children, ages 13, 11, and 6.
“YouTube is a bane in our lives. Ideally, it wouldn’t exist. Our son isolated himself in his room for nearly two weeks, immersing himself in YouTube and games during his recent school holidays. Dan, parents of 15 and 12-year-olds, Melbourne
“YouTube offers some degree of parental control over content, but certain aspects of their systems seem ineffective. [Our son’s] interests narrow down his feed, leading us to worry he might stumble upon something entirely inappropriate.” Gerald, father of a 13-year-old in Canberra
“We struggle to control what they’re watching. Even in the most secure settings on YouTube Kids, my children have inadvertently accessed frightening content disguised as children’s television. Peter, father of three children aged 2, 4, and 6, Sydney.
“It’s virtually impossible to monitor what they watch. Even a cursory glance at the feed reveals that my daughter is exposed to an abundance of material propagating beauty and body image stereotypes. Richard, parent from Hobart, ages 10 and 13.
“My kids are young, and their definitions can easily be swayed by repeated reward programming that triggers dopamine release from vibrant visuals. My issue with YouTube is that it operates much like a poker machine, monetizing the thirst for dopamine; we’re all drawn in. The bright lights and high-energy tropes are at the core of this massive platform.” Monique, parent of an 8-year-old and an 11-year-old in Bellpost Hill.
‘They can watch it non-stop for hours.”
From fleeting attention spans and wasted time to concerns about potentially harmful content slipping through, many parents feel YouTube’s algorithms promote excessive viewing and present harmful material.
“I’m concerned about how the short content affects my children’s attention spans. I have to offer warnings before turning it off to help them transition away from the screen. Sydney parents, ages 3 and 5
“The time wastage, actively encouraged through algorithms without forewarning on upcoming content, makes things stranger and more extreme. I lack trust in tech companies regarding the happiness of our children. Alicia, parents from Colonel Light Garden, aged 8 and 12
“When left unsupervised, they end up watching a bizarre mashup of short content, which includes both rubbish and terrifying videos like the horror game Poppy Playtime. Our youngest suffered from nightmares for months after watching this at a friend’s house for three hours a few years ago.
I genuinely support YouTube’s educational efforts, but kids seem more inclined to watch junk instead of that. ” Damian, father of ages 9 and 12 in Sydney.
“It’s frustrating because YouTube often exposes children to inappropriate content. The shorts are particularly troublesome. Mat, father of 16 and 11-year-olds in Ballarat.
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“I teach ethics at my local public school, and half my students express a desire to become gaming YouTubers.
“It’s all about content that lacks value. I’m not overly concerned about “inappropriate content” since it’s ultimately about completely worthless material, and children struggle to differentiate between what’s appropriate and what isn’t.” Parents of ages 15, 13, and 10
“It’s a real addiction, leading to severe tantrums when restrictions are applied.” A parent of a 16-year-old in Brisbane, Queensland.
“They can easily watch for hours without any breaks. Our current rule is limiting them to an hour a day, especially because when we turn it off, they quickly melt down and cry.
“My 12-year-old has better regulation but I’m still worried about videos that appear kid-friendly yet end up being problematic… We really dislike YouTube and wish it didn’t exist.” Harrisdale, parent of three children, aged 7, 10, and 12.
“He could choose what he wanted, but he primarily views the shorts. We’ve noticed that these shorts affect his mood. We’ve tried to stabilize his YouTube experience by steering him towards more educational content.” Kevin, father of a 13-year-old in Brua.
“He learned to crochet through YouTube.”
Many parents acknowledged the educational advantages YouTube offers, from supporting niche hobbies to serving as a platform for children to express themselves creatively as content creators.
“I worry about the vast amount of unfiltered content he could easily come across if not monitored, but my greater concern is losing access altogether. He learned how to crochet from YouTube. Single parent of a teenage son, ACT.
“We utilize YouTube for educational purposes (e.g., MS Rachel, Mads Made, Volcanoes, David Attenborough content) as well as for entertainment (e.g., Teeny Tiny Stevies for videos, Music Videos, etc.). YouTube is the best educational platform in history!!!” Melbourne parents of ages 2 and 5.
“My sons, 11 and 14, frequently use YouTube for information and gaming content. My oldest even has an account where he posts videos about Ali’s colony. [I support the ban]. Many kids share knowledge and enthusiasm in healthy ways.” Sydney parents, ages 11 and 14.
“Our son uses YouTube daily for his passion, creating stop-motion films using Lego. He dedicates hours to producing, editing, and uploading beautiful video clips to his channel, gaining followers. Dan Arno, father of an 11-year-old in Munich.
“If these companies refuse to regulate themselves, action must be taken.”
Parents expressed varied opinions on whether a ban on YouTube accounts for those under 16 would be beneficial or effective.
“I am wholly opposed to the current laws. We need to push for tech companies to alter their content policies. It’s essential to require personal identification for age verification when uploading content online.” Parents of 12 and 15-year-olds in Brisbane.
“Now, I have to restrict my child’s YouTube access and either provide oversight or create a fictitious account. This isn’t something I want to do. [Gen X] intervenes in areas they shouldn’t. Parent of two children in West Sydney.
“Digital platforms and high-tech corporations have generated a proliferation of violent and antisocial material from content creators, which is viewed countless times by impressionable children. Parents find it challenging to monitor this content, with only the content creators and technology giants benefitting.” Parents of a 16-year-old in Windsor.
“Their accounts give us access to their viewing history. However, a ban is impractical. Age registration infringes on my privacy.” Tim, parent of two children in Blackburn.
“I am fully in support of the ban. Tech companies have repeatedly demonstrated their lack of interest in fostering a safe environment for children.” Gerald, father of a 13-year-old in Canberra.
“I feel torn about this. I’m convinced the ban will be easily bypassed by those under 16. But I see it as a proactive attempt to curb children’s access to inappropriate content.” Parents of a 5-year-old in Adelaide.
Recent studies indicate that a dog’s response to your preferred TV show can reveal much about your personality.
In a recent Nature study, researchers found that enthusiastic dogs tend to interpret what they see on TV as reality, whereas anxious dogs are more inclined to react to non-animal elements, like humans and vehicles.
According to Lane Montgomery, a graduate student from Auburn University who spearheaded the research, there was a single consensus among all dogs regarding one topic.
“Overall, dogs generally seem to enjoy television, particularly when it features other dogs and animals,” Montgomery said to BBC Science Focus.
However, a note of caution before curating dog video playlists for your beloved pet: nearly half of the 453 dogs analyzed reacted every time their on-screen counterparts barked or howled.
Interestingly, breed and gender did not appear to influence their reactions, with older dogs exhibiting similar caution to younger puppies.
Dogs have been enjoying television alongside humans for nearly a century. Today, there are even specialized channels and programs designed to enhance dogs’ lives while their owners are engaged elsewhere.
Despite this, there has been little scientific inquiry into how dogs respond to visual stimuli.
To fill this gap, Montgomery encouraged dog owners to complete a survey that documented their pets’ responses to various dogs, animals, humans, inanimate objects, and environmental effects appearing on TV.
Montgomery posits that more impulsive dogs are likely to chase objects appearing on the TV screen or look behind the TV to track their movement, indicating they perceive the visuals as real.
Research indicates that dogs engage with TV for an average of 14 minutes – Credits: Getty Images/Manabougaswara
Conversely, skittish dogs were more prone to react when they saw people on TV or heard doorbells.
This research focuses solely on interactions with the most common individuals, rather than assessing whether these interactions are positive or negative.
Nevertheless, the insights gathered could aid owners in targeting training to eliminate undesirable behaviors and better identify which shows might be stressing their pets.
“The primary aim of this study was to enhance our understanding of how dogs react to various TV programs, thereby increasing the effectiveness of television as a tool for dog enrichment,” Montgomery stated. “Understanding which types of shows captivate dogs can help dog TV programs improve their content according to what dogs are likely to enjoy.”
About our experts
Lane Montgomery is a doctoral candidate in the Cognitive and Behavioral Sciences Program at Auburn University, USA. Her research concentrates on canine behavior and cognition to enhance the welfare of companion dogs and the efficiency of working dogs.
How many times have you checked your phone today? Or do you find yourself opening it and getting sidetracked by something else?
If you’re anything like me, you probably don’t realize just how much time gets consumed. The smartphone’s algorithms are designed to capture our attention and keep it, but there’s a new book by scholars aiming to help individuals reclaim that control.
I dedicated a week to testing some of the recommendations from this book.
The first step in overcoming this addiction is to recognize its presence and understand its implications. In her book, Smartphone Nation, Dr. Kaitlyn Regehr encourages readers to maintain a “phone usage journal” for several days to reflect on their activities, locations, time spent, and feelings during these sessions.
As I attempted to log the minutes spent on phone-related activities, I often found myself unaware of being sidetracked, making it quite challenging. However, over time, I’ve begun to notice these patterns more swiftly. My excessive phone usage seems to fall into two primary categories.
The first, which I refer to as “intentional procrastination,” occurs when I face a mentally demanding task. To avoid it, I find myself checking an app instead.
According to my journal, I excel in the art of procrastination, especially when fatigue sets in. I also seem to push challenging tasks to later in the day, particularly in the morning when I feel more awake.
“This technologyaims to facilitate seamless transitions between tasks and prolong time spent in a given application,” Dr. Regehr remarks. Photo: Adrian Sherratt/The Guardian
The second concerning habit I’ve identified, which I’ve dubbed the “whirlwind of forgetfulness,” often leads me to open my phone for one purpose, only to find myself immersed in random videos minutes later.
A word of caution: beware of distractions within the first 30 minutes of waking up! Just last Tuesday, while preparing snacks for school and ushering teenagers out the door, I emerged from this vortex only to find beauty entrepreneur Trinny Woodall sharing highlights from her recent trip to the hairdresser.
As per Regehr, who is an associate professor at Digital Humanities University College London, this embodies classic algorithm manipulation.
“This technologyis designed to ensure you transition seamlessly from one task to another application, keeping your attention focused there for as long as possible. Advertisers pay for this attention, but I’ve realized this week just how it operates.”
Regehr notes that aimless scrolling is not inherently detrimental. “Sometimes a break is essential, but she encourages reflection on how the content impacts your emotions.”
Some of the content I consume makes me feel inadequate or unfulfilled—ads for intermittent fasting and skincare products are only some that target me based on my age and browsing habits.
Regehr advocates for unfollowing individuals and brands that no longer inspire or educate and suggests curating what you wish to engage with.
“You might conclude: ‘I want enjoyable scrolling, but I’d prefer a more purposeful approach to what occupies my time.’ The algorithm doesn’t just select what feeds you.”
Dr. Regehr suggests visually enhancing your phone to make it less appealing. Photo: Adrian Sherratt/The Guardian
That’s sound advice, though this digital decluttering must wait for a less hectic moment. Regardless, I am eager to test another one of her techniques: switching my phone to grayscale mode via accessibility settings.
Dr. Alex Taylor, a marketing instructor at Newcastle Business School in Australia, endorses this approach. “One clear reason smartphones vie for our attention is the level of stimulation they deliver. Reducing this stimulus through limiting exposure to high-definition images is a sensible step.”
Indeed, I’m finding it challenging to locate apps without the colorful icons that enticingly beckon me from my display. The reduced visual stimulation means less temptation, but it can also complicate navigation. When necessary, it’s not the most convenient option.
Despite tracking my smartphone usage, I believe I’ve only captured a fraction of the distractions I face.
Dr. Maxi Heitmayer, a human-computer interaction researcher at the London School of Economics, shares this perspective. In one study, Heitmayer observed that when 41 participants were equipped with wearable cameras and checked their phones without unlocking them, these brief checks, while seemingly insignificant, were still disruptive.
“I discovered that whenever I had a brief pause in an activity, like flipping through a book or chopping vegetables, I would end up checking my phone,” Heitmayer shares.
Breaking this cycle is challenging. More recent research by Heitmayer indicates that keeping a phone out of reach reduces usage, but often, users shift that distraction to a desktop screen instead.
He suggests keeping my phone in another room as a method to capture my attention each time I feel the urge to check it. Frequently, this urge arises to check messages, explore random ideas online, or simply follow established habits.
And our phones are certainly convenient. Just the other day, when I called up to check something, I missed a call from my daughter’s school regarding her lunch account. When I eventually saw that message, I promptly opened the app to make a deposit, but the grayscale effect was frustrating.
Nonetheless, my digital detox has encouraged me to be more mindful of my smartphone interactions. Since starting my journal, I’ve noticed that I no longer get sucked into the whirlwind of forgetfulness as much. Although I still engage in procrastination, I’m striving to fill these intentional breaks with apps and feeds that genuinely bring me joy.
This mini digital detox is shifting my aimless browsing into purposeful usage, increasing my awareness of my phone habits.
Regehr and her team suggest a tiered approach to digital engagement, akin to a healthy eating pyramid. The base represents essential habits, while the apex is reserved for indulgent treats. For her, the digital equivalent of these ‘cupcakes’ includes a vintage thrift shopping app.
I’m not yet perfect, but I’m learning to reshape my smartphone habits. And yes, as long as I choose to tune in, I consider the occasional Trinny Woodall video a worthy indulgence.
Tips for a Healthy Digital Diet
Cultivating a healthier relationship with your smartphone doesn’t necessarily mean going cold turkey or stashing your device away. Rather, regaining a sense of control involves simple modifications. Dr. Kaitlyn Regehr recommends these strategies:
Establish app limits on frequently used platforms—not just mentally, but also through your phone’s settings.
Reflect on who truly deserves your attention: Who do you genuinely want to hear from? Consider silencing unwanted notifications and setting unique ringtones for different contacts.
Alter your temptation by relocating social media apps off your main screen or deleting them entirely, allowing access only via a browser.
Experiment with greyscaling your phone; you may find that the allure of Instagram and TikTok diminishes without vibrant colors luring you in.
Use varied browsers to limit targeted ads related to shopping and chatting, or activate Incognito mode to avoid cookie tracking.
Implement tangible boundaries by designating screen-free zones and times, such as no phones on the dining table and digital curfews before bedtime.
Smartphone Nation (Pan Macmillan, £22) by Kaitlyn Regehr. To support the Guardian, please order a copy Guardianbookshop.com. Shipping charges may apply.
As the saying goes, you can’t brush aside the truth, but you can examine it closely—and you definitely should.
Medical professionals have long recognized that the state of our toilets offers valuable insights into our overall health. This wisdom also applies to how frequently we use them.
Discovering the Goldilocks Zone of Bowel Movements
Last year, a team of researchers found a connection between the frequency of bowel movements and long-term health outcomes.
They studied 1,400 healthy adults, excluding those with certain conditions and medications that could alter their stool.
The researchers categorized bowel movement frequency into four groups: constipation (one or two movements per week), low normal (three to six movements per week), high normal (one to three movements per day), and diarrhea.
According to the Bristol Stool Chart—or perhaps suspicious cupcakes—your stool should neither be too hard nor too soft. – Illustration: Lynn Bremner
Within this scale, the team identified a sort of Goldilocks zone.
Ideal bowel movements fall within a high normal range, according to Professor Shawn Gibbons, one of the study’s authors from the Institute of Systems Biology.
“Going every other day is reasonable. Ideally, twice a day is within a safe range,” he explains. “Some people take pride in it; they make a point to go at 10 a.m. every day.”
What Our Stool Reveals About Gut Health
Gibbons’ fascination with our collective bowel habits stems from the increasing understanding of the microorganisms inhabiting our gut.
“Transit time or intestinal motility is a crucial factor in this ecosystem,” he notes.
As stool moves through the intestine, microorganisms utilize available dietary fiber, fermenting it into beneficial fatty acids.
However, if the stool lingers too long, these microorganisms switch to protein, leading to toxin release into the bloodstream.
“Accumulations of toxins, like indoxyl sulfate and trimethylamine, are associated with chronic kidney and cardiovascular diseases,” Gibbons warns.
The average individual produces 3,500-3,800 kilograms (7,700-8,400 pounds) of stool in their lifetime. – Photo credit: Getty
Regular bowel movements lead to similar yet subtly different biological processes.
“Individuals with diarrhea often show elevated levels of systemic inflammation, such as C-reactive protein,” he clarifies. “I noticed a stress marker in the liver that ended up in the bloodstream.”
Of course, there are natural variations in how often people experience bowel movements. Most people recognize when their patterns change, but many healthcare providers aren’t overly concerned.
Gibbons states that the general consensus among clinicians is that unless changes are extreme, treatment may not be necessary.
“However, we argue that variations might be worth investigating,” he says. “Aiming for a consistent schedule of once a day or every other day is important. Deviating from this pattern can raise potential risk factors for chronic illnesses and aging.”
Examining Stool Texture and Consistency
Another way to evaluate your stool is by observing its characteristics. The Bristol Stool Scale serves as a visual guide to assessing stool health and can be quite revealing.
Developed in 1997 as a diagnostic tool, the scale categorizes stool into seven types—from small, hard pellets to watery diarrhea.
In addition to frequency, we should also seek a healthy balance in terms of shape and consistency. A smooth, sausage-like stool that passes easily is considered ideal.
It’s also necessary to notice the effort involved during bowel movements. Stool should not feel like a strenuous ordeal, nor should it feel like it’s happening all at once.
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Emphasizing a Healthy Lifestyle
If you find yourself consistently outside these Goldilocks zones, researchers suggest several strategies.
Gibbons and his colleagues discovered that individuals who fall into the beneficial higher frequency category tend to lead healthier lifestyles.
“They consume more fruits and vegetables, are more physically active, and tend to hydrate better,” he mentions. “These three factors can make a significant difference.”
He also recommends exploring new health trends. “Consider taking dietary fiber supplements or incorporating flaxseed and chia seeds into your meals. These can be quite beneficial.”
Be wary of certain wellness trends as well. Popular weight loss medications like Wegovy and Ozempic may offer multiple health benefits, but Gibbons cautions that they can slow intestinal transit time, potentially affecting frequency.
“High-protein diets can also pose risks due to the byproducts generated from protein fermentation. There is considerable evidence suggesting links to type 2 diabetes, particularly in younger individuals.”
So the next time you find yourself on the throne, consider it your personal health assessment.
Meet Our Experts
Professor Shawn Gibbons is an associate professor at the Institute of Systems Biology and leads the Gibbons Lab, which focuses on microbiology, ecology, and medicine. He earned his PhD in Biophysics from the University of Chicago in 2015. His expertise lies in microbial ecology, evolution, complex adaptive systems, bioinformatics, and the human microbiota.
Embarking on a new routine can feel intimidating, but it’s actually simpler than we often perceive. Here are some expert tips for ensuring that new habits stick.
How to establish improved study habits
One effective method for developing a habit is to attach a desired new behavior to an existing habit.
For instance, let’s say you want to incorporate a daily 10-minute German vocabulary study session into your routine. Identify habits you already have and integrate your vocabulary learning into them.
For example, if you already have tea every day at 3pm, try studying German vocabulary for 10 minutes while enjoying your tea.
Credit: Kyle Smart
How to cultivate healthier social media habits
There is often criticism surrounding our device and social media usage, but ultimately, only you can determine if your phone is interfering with more important priorities.
If you feel this is the case, one effective way to regain control is by reducing your device usage habits, starting with disabling notifications.
Scheduling specific times for using email, social media, or news websites can help break habitual behaviors and allow for more intentional device usage. It’s a proven strategy.
How to develop a consistent exercise routine
If you’re currently not exercising at all and the thought of starting a new exercise habit seems overwhelming, try the 2-minute rule.
This rule, popularized by James Clear in his book Atomic Habits, recommends starting with just two minutes of a new activity to ease its incorporation into your daily life. Once it becomes a habit, you can gradually increase the duration.
Credit: Kyle Smart
Start with 2 minutes of exercise at 8 a.m. daily, whether it’s a brief walk, stair climbing, or some jumping jacks. Gradually increase the duration as it becomes routine. Remember, consistency is key.
Strategies for adopting sustainable habits
The psychology of habits sheds light on why behavior change can be slow, even when attitudes towards the environment evolve. Despite acknowledging the importance of eco-friendly practices, many individuals still engage in harmful behaviors out of habit.
For example, placing recycling bins near individual desks led to a significant increase in office paper recycling rates, while slowing down elevator doors reduced elevator usage. Small adjustments can lead to significant changes in behavior.
Drone footage of a gray whale captured off the coast of Oregon over a seven-year period reveals new details about how the giant marine mammal finds and eats its food.
The findings, described in two studies published this summer, include that gray whales use different swimming techniques to gather food depending on their size and age, and that larger whales are able to swim more easily in the water. It includes a high chance of spitting out a “bubble explosion” to stay in place.
“Until this study, we thought all whales exhibited this behavior,” said Clara Byrd, lead author of both studies and a research scientist at Oregon State University's Marine Mammal Research Institute. said. “No one thought there was a pattern to who behaved in what way.”
Bird's research also found that whales use different predation techniques depending on the depth at which they forage and the habitat of their prey. Such information could inform future conservation efforts, she said, as it provides insight into the types of habitats that need to be protected to maintain whales' access to food.
“While we are not currently actively seeking to protect specific habitats, future concerns include the possibility that whales of different ages may not all be using the same habitats. “It's very important to know,” Bird said. “It will help us manage them in the future.”
Drone footage of gray Wales shows them standing on their heads and exploding bubbles. oregon state university
Whales eat amphipod crustaceans, such as small shrimp and earthworms. These creatures suck up water and sediment from the ocean floor where they live and use their whiskers to filter and consume food. Gray whales are usually observed alone or in small groups, but large groups can sometimes be seen on feeding and breeding grounds.
Bird and her team conducted a survey off the coast of Newport. During their seven-year voyage, the group used drones to track and record individual whales. They used identification markers such as scars, spots, and tail shapes to identify specific whales.
The research team tracked 78 gray whales in a total of 160 sightings from 2016 to 2022. In drone footage, young, small whales were observed often swimming sideways or facing forward, opening and closing their mouths in an attempt to find and ingest food. . Older, larger whales, on the other hand, tended to dive and then stay in place with their heads down, in what scientists describe as a “handstand technique.”
As whales grow larger, the probability of such headstands increases, but the probability of forward swimming tactics decreases, the study found. Water depth and habitat type, including rocky, sandy, and coral reefs, also influenced the whales' approach.
Drone images show a gray whale using a sidestroke technique to forage for food. oregon state university
Bird believes the switch in technique is due to the maturation of the whale's muscles and its level of strength and coordination.
Her team's second study was published Published in Ecology and Evolution In August, we explained how older, larger whales emit air through their blowholes to stay underwater as they forage.
These “bubble explosions” can reduce the whale's buoyancy and help it sink. Larger whales have a greater need for this because their lungs hold more air, contain more fat, and are easier to float.
The discovery was based on observations of 75 whales. On average, the bubble explosions occurred 27 seconds after the whale dove took off in search of food, and most were observed while the whales were doing a handstand. The older and larger the whale, the more likely such an explosion will occur.
“Combining size and individual-level behavior in this way is a really interesting part of this study,” Bird said.
Susan Parks, a biology professor at Syracuse University who has published research on whale eating habits but was not involved in the new study, said documenting the diversity among whale species is important for scientists. said that it helps avoid inaccurate generalizations.
“When working on conservation efforts and protecting endangered species, it's really important to understand that there can be large variations in behavior,” Parks said. “So you can't just stop at a single observation.”
The park also highlighted the potential drones have for collecting detailed data about whales.
“There is so much we don’t know about whale behavior,” she said, adding that the study “uses drone footage to essentially monitor whale behavior to help explain how whales make a living.” “It gave us a completely different perspective on the details of what's going on,” he added.
I've seen my future and it's full of beans, both literally and figuratively. In addition to increasing the amount of beans, eat a lot of vegetables, no meat, avoid long periods of hunger and almost no alcohol. But in return for this dietary discipline, my future will also be longer and brighter. I'm 52 years old and can expect to live another 29 years with my current diet. But if I change now, I can earn another 10 years and live a healthy life until I'm 90.
This “longevity diet” is not just the latest fad, but the result of scientific research that extends beyond the human lifespan. And it's not just designed to prevent disease, it's actually designed to slow the aging process – that's the claim, anyway.
Of course, it makes sense to say that your diet can change your lifespan. Millions of people around the world still die prematurely each year due to lack of calories and nutrients. On the other hand, the estimate is 11 million people die every year from too many calories And the wrong kind of nutrients. Unnecessary ridicule inevitably leads to obesity and its obesity. cardiovascular diseasediabetes and cancer. The typical Western diet is high in sugar, refined starches, saturated fat, and low in whole foods, which can hinder your metabolism and make injuries even worse. This includes excessive release of insulin, a hormone that controls blood sugar levels and directly affects aging. Suffice it to say that the Western diet is not pushing the longevity levers in the right direction. But is it really possible to dig yourself into a later grave?…
aAnyone who saw the run that Tom Vickery uploaded to the sports-tracking app Strava on February 18th of last year might have been a little confused. The 30-minute sprint appeared to be taking place in the middle of the Channel, not far from Guernsey, toward the west coast of France. And, oddly enough, the run was in a straight line, as measured by a ruler, and was shown on Vickery’s public profile as a one-inch, unbending orange line within a blue swath of the app’s virtual ocean. Oh, and it was on world-record-breaking pace.
Of course, it probably came as no surprise to anyone who knows Vickery. The 38-year-old triathlon coach from Cambridge was on holiday to Bilbao for a two-day ferry trip, and this fairly fast jog was just one of almost four years of daily runs he had been recording on Strava at the time. Determined not to break the record on board, Vickery got up at 5am and spent his allotted 30 minutes sprinting up and down the deck. As the boat slid through the water, he appeared to be running faster than any long-distance runner in the world.
This is just one example of the lengths some people will go to to maintain a “streak.” A streak is something (actually anything) that continues uninterrupted over a period of time. It’s a form of gamification: the process of adding game-like elements to a task to make it more engaging. Perhaps the most famous “streak holder” is British runner Ron Hill, who ran every day for 52 years and 39 days (or 19,032 consecutive days), even going for a jog the day after breaking his sternum in a car accident in 1993.
Hill, a scientist, used to keep a diary of his runs, but more recently, advances in technology have made it possible to keep track of streaks in a more streamlined and user-friendly way. For example, on Snapchat, the word “streak” is part of the lexicon. A “snap streak” is the number of consecutive days that a user sends “snaps,” either photos or messages, to other users. To maintain a snap streak, a user must send a snap within a 24-hour period or the streak ends.
If you’ve ever felt like your cognitive abilities are not as sharp as they used to be, you might be struggling to recall names of actors or politicians in the news, for example. Perhaps mental arithmetic is not as easy for you anymore. This reflection may lead you to ponder the state of your brain and whether it’s on a downward trajectory.
It’s important to consider these aspects early on because brain development typically peaks in your 20s, and then cognitive functions gradually decline with age. Additionally, there is a growing risk of dementia, particularly associated with diseases like Alzheimer’s, in aging populations. However, both cognitive decline and dementia risk can be influenced by what experts call “modifiable risk factors,” offering a beacon of hope that there are lifestyle changes you can make to maintain mental acuity and lower the risk of dementia.
Be mentally active and boost your cognitive reserve
Psychologists and gerontologists often talk about cognitive reserve, which refers to the brain’s ability to adapt to aging and disease challenges. People with high cognitive reserve can perform well on cognitive tests despite exhibiting biological markers of Alzheimer’s disease, like protein build-up that impairs brain function. Engaging in activities such as reading, learning a new language, solving puzzles, and playing musical instruments can help boost cognitive reserve and maintain mental agility.
Interact with others
While brain-training games may not have broad benefits beyond the specific tasks they target, socializing with peers has been found to be a potent brain-training activity. Social isolation is considered a major risk factor for dementia, emphasizing the importance of engaging in lively conversations, joining clubs, or volunteering to keep your brain active and healthy.
Stay physically active
Physical activity not only benefits cardiovascular health but also contributes to better brain function and reduced cognitive decline. Incorporating exercises like running, swimming, or even gardening into your routine can help maintain cognitive abilities and lower the risk of dementia.
Eat a healthy diet
Avoiding excessive saturated fats and consuming plenty of fruits and vegetables can support brain health by eliminating harmful byproducts and providing essential nutrients. The Mediterranean diet, rich in fruits, vegetables, legumes, nuts, and olive oil, has been recommended for its brain-protective properties.
Stay curious
Personality traits like openness to experience are linked to better brain health and lower dementia risk. Activities that spark curiosity and awe can enhance cognitive abilities and mental flexibility. Incorporating habits like exploring new environments, trying new experiences, and enjoying cultural activities can promote brain health.
Think positively
Your mindset about aging can significantly impact your brain health. Maintaining a positive outlook, along with engaging in mentally stimulating activities and healthy habits, can contribute to long-lasting mental sharpness. Seeking out positive role models and adopting a proactive approach to brain health can help unlock your brain’s full potential.
BIt's easy to feel a kinship with pop star Selena Gomez, considering her 430 million Instagram followers, reported net worth of $800 million, and close relationship with Taylor Swift. rare. However, 11 days have passed since the new year started, heading “Selena Gomez returns to Instagram, 18 hours after announcing social media hiatus.''
I feel extra conscious of my bad habits – probably due to my depressed body evidence suggests We usually give up on our New Year's resolutions by mid-January.
Info about Selena Gomez
It's not even noon yet and I've spent 45 minutes on Instagram today. She drank two cups of coffee, but I can't rule out the possibility of a third one. My mild headache is a solemn reminder that I ended up having three drinks last night after a sudden hinge date ruined my plans for a quiet evening. And I just took a small swig from her nearly empty vape, which I had vowed to buy one last time.
At least I'm not eating sugar yet.
As you can see, I'm ambivalent about what I consider to be my vices, and I'm more or less attached to them. Most of the time I can ignore them as reliable pleasures in life and they are reasonably tolerable.But peer pressure to be better is always insidious and becomes especially acute at the beginning of a new year..
My newsfeed is full of stories about financial goal setting, improving fitness, non-alcoholic drinks, and sugar substitutes.Friends are pledging to spend the month of dry January taking 10,000 steps a day and cutting out junk food. On the other hand, I think I may be missing out on the tricks of the trade by missing out on the opportunity for a fresh start.
“hand“At this time of year, the focus is on what to start doing and what to stop doing,” says the counselor. georgina starmer. She links it to the excesses of the just-past Christmas season: What do you change? ”
But the flip side of this focus on self-improvement is the need for self-monitoring. We become more aware of our supposed flaws and shortcomings, which may not be particularly harmful and may even bring us joy.
An imaginary diagram of the interstellar medium distribution of active galactic nuclei based on current observation results. Dense molecular gas from the galaxy flows along the disk’s surface toward the black hole. The energy generated by the high temperature of the material accumulated around the black hole destroys molecular gas, converting it into atoms and plasma. Most of these multiphase interstellar mediums are jets flowing outward from the galactic center (mainly plasma jets occur directly above the disk, and mainly atomic and molecular jets occur at an angle). However, it turns out that most of the particles flow back into the disk like a fountain. Credit: ALMA (ESO/National Astronomical Observatory of Japan/Nuclear Astronomical Observatory), T. Izumi et al.
Recent advances in astrophysics have led to groundbreaking observations of gas flows around supermassive black holes. These observations were made with great detail. light years Important insights into the behavior of these giant universes have been revealed. Remarkably, the researchers found that while large amounts of gas are attracted to these black holes, only a small portion (about 3 percent) is actually consumed. The remaining gas is ejected and recycled back to the host galaxy.
Not all substances fall into this. Black Hole It is absorbed, but some is excreted as effluent. However, it has been difficult to measure the ratio between the amount of material that a black hole “eats” and the amount that it “falls into.”
An international research team led by Assistant Professor Takuma Izumi of the National Astronomical Observatory of Japan is developing the Atacama Large Millimeter/Submillimeter Array (alma telescope) Observe a supermassive black hole in the Circus Galaxy, 14 million light-years away in the direction of the constellation Circus. This black hole is known to be actively feeding.
The center of the Silcinus galaxy observed with ALMA. Carbon monoxide (CO; indicating the presence of a medium-density molecular gas) is shown in red. Atomic carbon (C; indicates the presence of an atomic gas) in blue. Green is hydrogen cyanide (HCN; indicating the presence of a dense molecular gas). Pink hydrogen recombination line (H36α; indicating the presence of ionized gas). The central dense disk of gas (green) is about 6 light-years wide. The plasma outflow proceeds almost perpendicular to the disk. Credit: ALMA (ESO/National Astronomical Observatory of Japan/Nuclear Astronomical Observatory), T. Izumi et al.
ALMA’s role in solving the mystery of black holes
Thanks to ALMA’s high resolution, the research team was able to measure the inflow and outflow around a black hole for the first time on a scale of several light years. By measuring the flow of gases in different states (molecules, atoms, and states), plasma) The team was able to determine the overall feeding efficiency of the black hole and found it to be only about 3%. The researchers also confirmed that gravitational instability is driving the influx.
The analysis also showed that most of the ejected outflow was not fast enough to escape from the galaxy and be lost. They are recycled into the perinuclear region around the black hole and begin falling slowly towards the black hole again.
Reference: “Feeding and feedback of supermassive black holes are observed at subparsec scale” Takuma Izumi, Keiichi Wada, Masatoshi Imanishi, Koichiro Nakanishi, Kotaro Kono, Yuki Kudo, Daiki Kawamuro, Shunsuke Baba, Naoki Matsumoto , Yutaka Fujita, Conrad R.W. Tristram, 2 November 2023 science. DOI: 10.1126/science.adf0569
This research was funded by the National Astronomical Observatory of Japan and the Japan Society for the Promotion of Science.
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