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Surprising Fact: Skipping sleep CAN cause weight gain.
Women in an American Journal of Epidemiology study who slept less than seven hours were more likely to gain weight; other research has shown that even partial sleep deprivation ups production of the hormone ghrelin, which triggers hunger.
Surprising Fact: Yoga ISN'T a big calorie burner.
While doing yoga does improve flexibility and strength, it's not much of an aerobic activity, according to an ACE study: a 50-minute power yoga session burns 237 calories, versus the 500 to 600 calories you'd fry Spinning for that amount of time.
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