Sleeping less than 7-8 hours a night caused subjects to be more likelier to gain 11 pounds over six years. What causes this? Less sleep decreases the appetite-suppressing hormone leptin and increases the appetite-stimulating hormone ghrelin. Also, being tired makes you move around less, therefore, burning less calories.
Source: University of Phoenix Library, Greenfield, P. (Sept 2008). Getting too much or too little sleep may widen your waist.(Brief article). . Womens Health, 5, 7. p.026. Retrieved January 05, 2009
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