Diet Plans & Programs. There's one piece of advice every weight loss guru now agrees on: getting plenty of sleep is one of the biggest secrets to losing weight and keeping it off. (Try these effective sleep-boosting strategies if insomnia is responsible for your lack of sleep.) Research now shows that the body is most metabolically active during sleep, so the longer we sleep, the more we rev up our fat-burning engines. Lack of sleep also plays havoc with two key metabolic hormones, leptin and ghrelin, which control hunger and satiety. Deprive yourself of sleep, and ghrelin levels increase while leptin levels decrease. The result: more craving, less feeling full. Even worse, when you're weary you crave "energy" foods, which usually means chips, sweets, baked goods, or soda. Put the two together and you can see how the typical type-A lifestyle gradually puts on the pounds.

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