Sleep with the light on? Women may get weight

Sleep with the light on? Women may get weight

Once upon a time, there was a girl sleeping with artificial light at night, then she.....  gained weight quietly. For female, this may be not good news. If you’ re afraid of the dark or just prefer sleeping with a light on, you might want to read this.

A new study, a paper published in JAMA Internal Medicine from the National Institutes of Health, have revealed that there is an association between any exposure to artificial light at night while sleeping and weight gain in women. So cutting off lights at bedtime could reduce women's chances of becoming obese.

1. Women who sleep with the light on at night are more likely to gain weight

Researchers said that exposure to artificial light at night may alter hormones and other biological processes in ways that raise the risk of health conditions like obesity.

The research team conducted a survey from nearly 43,722 women in the Sister Study, a cohort study that examines risk factors for breast cancer and other diseases. The participants, aged 35-74 years, had no history of cancer or cardiovascular disease and were not shift workers, daytime sleepers, or pregnant when the study began. The study questionnaire asked whether the women slept with no light, a small nightlight, light outside of the room, or a light or television on in the room.S

The scientists used weight, height, waist and hip circumference, and body mass index measurements taken at baseline, as well as self-reported information on weight at baseline and follow-up five years later. Using this information, the scientists were able to study obesity and weight gain in women exposed to artificial light at night with women who reported sleeping in dark rooms.

The results varied with the level of artificial light at night exposure. For example, using a small nightlight was not associated with weight gain, whereas women who slept with a light or television on were 17% more likely to have gained 5 kilograms, approximately 11 pounds, or more over the follow-up period. The association with having light coming from outside the room was more modest.

2. pre-pregnancy obesity may affects infant weight

A finding of 264% increased odds of child obesity when mothers have pre-pregnancy obesity published in PLOS Medicine suggests that commencing obesity prevention interventions prior to conception would be beneficial.

3. women's pre-pregnancy overweight or obesity produces changes in breast milk, which can affect infant growth

Researchers form Louisiana State University Health Sciences Center, reported that women's pre-pregnancy overweight or obesity produces changes in breast milk, which can affect infant growth.

polyunsaturated fatty acids, inflammatory markers and hormones to infant weight, length, head circumference and percent fat mass at 4-8 weeks postpartum in the same group of 33 women were included in the analysis.

The researchers found that pro-inflammatory qualities of breast milk were associated with infant growth measures regardless of maternal pre-pregnancy BMI. However, infants born to women with overweight or obesity demonstrated less responsive growth to breast milk.

The study has been published in PLOS ONE.

So butterfly effect, sleep with the light on, a girl may get weight, then pre-pregnancy obesity may lead to a fat baby born...

Source: Science Daily
Original title: Sleeping with artificial light at night associated with weight gain in women
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