Longer daylight hours cause obesity

Longer daylight hours cause obesity

Scientists came to surprising conclusion. They found out that longer daylight hours contribute to obesity and its comorbidities, like type 2 diabetes and cardiovascular diseases.

It is a fact that any artificial light makes daylight hours longer so that people can work at night. But few people know that this violates the natural circadian rhythm in the human body, followed by sleep disorders, hormonal failure and even female reproductive system diseases.


Therefore, scientists have conducted some experiments on three groups of muscles of rodents; to see what were the other aspects the longer daylight hours could have affect. The first room where the experimental rodents lived was lit for 12 hours a day, the second room – for 16 hours and the third one – 24 hours.

This experiment lasted 5 weeks and by its end, those mice who lived in the third room (that was lit for 24h), became overweight, although they had been eating the same food as other experimental mice.

  • The researchers say that this is happening because the quantity of daylight hours affects the functions of brown fat, which main function is to keep the energy balance in the body.

Longer daylight hours violate the function of brown fat tissue, resulting in the accumulation of fatty acids and glucose in the body.

Moreover, scientists found out that the failure in the work of cells of the brown fat had caused type 2 diabetes and dangerous cardiovascular disorders.
If you want to learn more, read PNAS magazine.