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  • People ate nearly 300 calories more when only allowed to sleep 4 hours vs 9 hours per night

    Posted by .(JavaScript must be enabled to view this email address)
    Friday, August 05, 2011 9:09 am Email this article
    People consumed 296 more calories when they were only allowed to sleep 4 hours per night compared to when they were allowed to sleep their normal 7-9 hours according to a study from researchers at Columbia University in New York.

    On the fifth day of being allowed only four hours of sleep, they consumed an average of 2813 calories versus 2517 calories when they were allowed their normal amount of sleep. Increased Fat Consumption

    Fat consumption increased by 21 grams or 189 calories after short sleep

    Most of the increase in calories came from an increase in fat, consuming an extra 21 grams of fat (189 calories of fat).



    Subjects: 15 normal weight men and 15 normal weight women, 30-49 years-old

    The study involved 15 men and 15 women, 30- 49 years-old with a body mass index of 22-26 (normal weight), who regularly slept 7-9 hours per night.

    Resting metabolism (1455 calories vs 1486 calories) and total energy expenditure (2589 calories vs 2611 calories) did not differ



    Conclusion: A reduction in sleep increases calorie and fat intake

    “Our data show that a reduction in sleep increases energy and fat intakes, which may explain the associations observed between sleep and obesity,” the researchers concluded.

    “If sustained, as observed, and not compensated by increased energy expenditure, the dietary intakes of individuals undergoing short sleep predispose to obesity.”


    St-Onge MP, Roberts A, Chen J, Kelleman M, O’Keeffe M, Roychoudhury A, Jones P. Short sleep duration increases energy intakes but does not change energy expenditure in normal-weight individuals. Am J Clin Nutr. 2011 Aug, 94(2):410-16.


    Marie-Pierre St-Onge, PhD
    Department of Medicine
    New York Obesity Research Center
    St Luke’s/Roosevelt Hospital and College of Physicians and Surgeons
    Columbia University
    New York, New York, USA.
    .(JavaScript must be enabled to view this email address)

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    On Aug 15, 2011 at 5:01 am Pierre wrote:

    . . . . .

    But doesn't the 'extra' 300 cal cover in part the energy expenditure for being up and about for an extra 3 to 5 hours? Perhaps observing the amount of sleep that obese individuals actually have would say more about any correlation between obesity and sleep.

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