It may sound like it would be healthy to consume nothing but fresh fruit and vegetable juice for days, but there's one teeny tiny problem: These diets don't deliver nearly enough calories, protein, or fiber, which can lead to impaired digestion, fatigue, and even muscle deterioration. Plus, any weight loss achieved on a cleanse or detox is likely temporary—experts say you're pretty much guaranteed to gain back every lost pound. Moral of the story: Don't waste your money. Just eat whole, minimally processed foods and follow these 10 simple rules of eating clean.