A group of experts from the US National Institutes of Health conducted a study associating sleep to light or television with the risk of gaining weight or suffering from obesity in women.
According to a statement, the team used data from a questionnaire made for their work 43,722 women between 35 and 74 years of age. The participants, who they had no history of cancer or cardiovascular disease, were not shift workers and were not pregnant when the study began, they needed to respond if they slept without light, with low light, with light outside the room or with a light or television in it living room.
Analyzing data such as weight, height, waist circumference and body mass index and hip ratio, the scientists studied the cases of obesity and weight gain experienced by women exposed to artificial light at night compared to those who claimed to sleep in dark environments.
The results of the study showed that while a small night light was not associated with weight gain, women who slept with light or television were connected to the room. They were 17% more likely to gain 5 pounds in the course of five years.
"Humans are genetically adapted to a natural environment consisting of sunlight during the day and darkness at night," said one of the authors, Chandra Jackson, who added that "exposure to artificial light at night can change the hormones and other biological processes, increasing the risk of health problems such as obesity. "