If you do not get enough sleep are likely to eat more. The indication comes from a study published in the American Journal of Clinical Nutrition, the results reinforce previous evidence that sleep affects the neurophysiological mechanisms that regulate feelings of hunger and energy balance. The new survey, in which they were involved 22 healthy individuals (average age: 22 / - 3 years, BMI: 22.30 / - 1.83 kg / sqm), has planned two sessions lasting 48 hours. During the first night of each session, the participants slept for eight hours (from midnight to 8) or four hours (from 2 to 6). Bread with butter and jam for breakfast, buffet lunch and dinner menu are free, therefore, been made available to participants who were able to consume without any restrictions. At this point were measured: physical activity, sense of hunger and satiety, desire for specific foods and feeling sleepy. Than those who slept eight hours, those with only 4 hours of sleep have introduced 22% more calories, a day after the restriction, and they came with the hungry at breakfast and dinner. Although sleep deprivation has led to an increase in physical activity, the difference more marked than those who slept more, were found the greatest feeling sleepy. "Measurements of energy expenditure in the long term, will help to clarify whether the lack of sleep can be considered a risk factor for obesity" the authors conclude.
Am J Clin Nutr. 2010 Mar 31. [Epub ahead of print]
Acute partial sleep deprivation Increases food intake in healthy men.
Brondel L, Romer MA, Nougués PM Touyarou P Davenne D.
Centre Européen des Sciences du Goût Dijon Cedex France.
Abstract BACKGROUND: Acute partial sleep deprivation Increases Plasma Concentrations of ghrelin and decreases leptin Those of. OBJECTIVE: The Object Was to observe Modifications in energy intake and physical activity after acute partial sleep deprivation in healthy men. DESIGN: Twelve men [age: 22 +/- 3 y; body mass index (in kg/m(2)): 22.30 +/- 1.83] completed a randomized 2-condition crossover study. During the first night of each 48-h session, subjects had either approximately 8 h (from midnight to 0800) or approximately 4 h (from 0200 to 0600) of sleep. All foods consumed subsequently (jam on buttered toast for breakfast, buffet for lunch, and a free menu for dinner) were eaten ad libitum. Physical activity was recorded by an actimeter. Feelings of hunger, perceived pleasantness of the foods, desire to eat some foods, and sensation of sleepiness were also evaluated. RESULTS: In comparison with the 8-h sleep session, subjects consumed 559 +/- 617 kcal (ie, 22%) more energy on the day after sleep restriction (P < 0.01), and preprandial hunger was higher before breakfast (P < 0.001) and dinner (P < 0.05). No change in the perceived pleasantness of the foods or in the desire to eat the foods was observed. Physical activity from 1215 to 2015 was higher after sleep restriction than after 8 h of sleep (P < 0.01), even though the sensation of sleepiness was more marked (P < 0.01). CONCLUSIONS: One night of reduced sleep subsequently increased food intake and, to a lesser extent, estimated physical activity-related energy expenditure in healthy men. These experimental results, if confirmed by long-term energy balance measurements, suggest that sleep restriction could be a factor that promotes obesity. This trial was registered at clinicaltrials.gov as NCT00986492.
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