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Detox Diets: Cleansing the Body.

Juice Up Your Health

Not Great For Weight Loss

Just don't look at water fasts or juice diets as a weight-loss solution. As with the Atkins diet, restricting carbohydrates causes you to lose weight -- but you'll gain it all back, says Dillard. "You're losing water in your system."

Juice diets do prevent your body from going into a state called ketosis, he says. Ketosis means your body has no carbohydrates to burn for energy, so it has to burn stored fat or whatever else is available, he tells WebMD. "You feel bad, even smell bad. That's what makes you feel like hell during a [water-only] fast. But is that because the toxins are coming out? No! You're going into ketosis. It's known physiology."

"There's nothing wrong with going on a juice fast for a few days," he says. "But it's not a great way to lose weight, because you'll gain it all back -- you yo-yo. It's just like the Atkins diet. The weight you lose is water weight."

Eating less -- that's definitely known to extend life, Dillard says. "The only reliable way to extend the lifespan of a mammal is under-nutrition without malnutrition. Studies show that if you cut back on 60% of the calories mice eat, they will live almost twice as long with much fewer tumors."

"The old-fashioned way of eating the right foods, getting exercise, clean living, keeping a positive mental attitude -- that's what works," he says.

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