It is common to be lactose intolerant: Mammals naturally lose the ability to break down lactose after weaning, when the genes responsible for this process are turned off.
According to research, about 70 percent of the world’s adults are lactose intolerant, while the rest can digest lactose thanks to the evolution of dairy farming about 9,000 years ago and genetic mutations that allow lactose tolerance.
Answering a question from Faye Martinez from Manchester, this article explains why some humans and animals become lactose intolerant despite being breastfed at an early age.
If you have any questions, please send them to the email address provided. For more information, contact us through Facebook, Twitter, or Instagram.
For more interesting science facts, visit our page.
Explore more:
Source: www.sciencefocus.com
