And drink plenty of water — up to 64 ounces a day — to go with the bulk, he says. Anytime the body processes or removes waste from the body it’s “detoxing.” Not surprisingly, the liver and the intestines are big players. Haas offers a few different detox programs, which differ in length and intensity (three-meals-a-day plan to fasting). 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."