weight

Sleeping less linked to weight gain (press release)

Thursday, June 29, 2006 by: NaturalNews
Tags: health news, Natural News, nutrition

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Women who sleep 5 hours or less per night weigh more on average than those who sleep 7 hours, according to a study to be presented at the American Thoracic Society International Conference on May 23rd.

The study found that women who slept for 5 hours per night were 32% more likely to experience major weight gain (defined as an increase of 33 pounds or more) and 15% more likely to become obese over the course of the 16-year study compared with women who slept 7 hours. Women who slept for 6 hours were 12% more likely to have major weight gain and 6% more likely to become obese compared with women who slept 7 hours a night.

The study included 68,183 middle-aged women who were enrolled in the Nurses Health Study. They were asked in 1986 about their typical night's sleep, and were then asked to report their weight every 2 years for 16 years.

On average, women who slept 5 hours or less per night weighed 5.4 pounds more at the beginning of the study than those sleeping 7 hours and gained an additional 1.6 pounds more over the next 10 years.

"That may not sound like much, but it is an average amount--some women gained much more than that, and even a small difference in weight can increase a person's risk of health problems such as diabetes and hypertension," said lead researcher Sanjay Patel, M.D., Assistant Professor of Medicine at Case Western Reserve University in Cleveland, OH.

Dr. Patel noted that this is by far the largest study to track the effect of sleep habits on weight gain over time. "There have been a number of studies that have shown that at one point in time, people who sleep less weigh more, but this is one of the first studies to show reduced sleep increases the risk of gaining weight over time."

The researchers looked at the women's diets and exercise habits to see if they could account for part of the findings. "Prior studies have shown that after just a few days of sleep restriction, the hormones that control appetite cause people to become hungrier, so we thought that women who slept less might eat more. But in fact they ate less," Dr. Patel said. "That suggests that appetite and diet are not accounting for the weight gain in women who sleep less."

The researchers also asked women about how much they participated in exercise activities such as running, jogging or playing tennis. But they didn't find any differences in physical activity that could explain why women who slept less weighed more.

"We don't have an answer from this study about why reduced sleep causes weight gain, but there are some possibilities that deserve further study," Dr. Patel said. "Sleeping less may affect changes in a person's basal metabolic rate (the number of calories you burn when you rest). Another contributor to weight regulation that has recently been discovered is called non-exercise associated thermogenesis, or NEAT, which refers to involuntary activity, such as fidgeting or standing instead of sitting. It may be that if you sleep less, you move around less, too, and therefore burn up fewer calories."

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