After dieting, hormone changes may fuel weight regain - CNN.com:
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Losing weight is hard, but keeping the pounds off can be even harder.
By some estimates, as many as 80% of overweight people who manage to slim down noticeably after a diet gain some or all of the weight back within one year.
A shortage of willpower may not be the only reason for this rebound weight gain. According to a new study in the New England Journal of Medicine, hunger-related hormones disrupted by dieting and weight loss can remain at altered levels for at least a year, fueling a heartier-than-normal appetite and thwarting the best intentions of dieters.
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