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."


Make the right changes. When cutting back on unhealthy foods in your diet, it’s important to replace them with healthy alternatives. Replacing dangerous trans fats with healthy fats (such as switching fried chicken for grilled salmon) will make a positive difference to your health. Switching animal fats for refined carbohydrates, though (such as switching your breakfast bacon for a donut), won’t lower your risk for heart disease or improve your mood.
Fasting indeed has a long-standing spiritual tradition. "Almost every religion has some type of fasting ritual -- Lent, Ramadan, Yom Kippur ... the Hindus and Buddhists fast, too," says James Dillard, MD, assistant clinical professor at Columbia University College of Physicians and Surgeons in New York City. He's author of Alternative Medicinefor Dummies.
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