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.”

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.”