The Master Cleanse
This “Master Cleanse” consists of three things: water, laxatives, and a lemon water concoction. This 650-calorie diet, far less than the recommend 2,000 calories daily, can last anywhere from 10 to 45 days, depending on the diet plan. Fasting is dangerous because it deprives the body of nutrients, and the low calorie intake means it isn’t safe to exercise while on this diet. Side effects can include nausea, vomiting, and fatigue, and there is no scientific evidence that it actually rids the body of toxins.