What it entails: Raw food followers eat a plant-based diet of uncooked (nothing can be cooked higher than 116 degrees) and unprocessed foods. Most do not eat any animal products, but some will consume unpasteurized milk and cheese. They believe cooking food destroys vital vitamins and enzymes that are critical for digestion. (The American Dietetic Association does not agree with this claim.) Who does it:Demi Moore, Bryan Adams and Woody Harrelson Advantages: "Most Americans in general could benefit from swapping out a large amount of processed food in their diet for foods in their natural state," says Hendel. Disadvantages: It's expensive to buy all fresh produce and time-consuming to buy and prepare meals. It's hard to find meals eating out. Some foods release more nutrients when cooked such as tomatoes and broccoli. The expert's opinion: "The raw food diet really makes a lot of demands on you that might not be able to be met in a busy person’s life," Hendel says. " A lot of people on this diet fail in the protein category and you need protein for satiation and muscle-building, two very components of keeping your weight in check. Also, we’re having struggles with contamination issues with some raw foods. You’re not cooking away any harmful organisms that might be there, that has become a problem with salmonella and E.coli."