There is a movement called "raw foodism" which promotes the consumption of raw food as a large percentage of the diet. Raw foodists believe that the greater the percentage of raw food in the diet, the greater the health benefits. Adherents of it believe that it encourages weight loss and prevents and/or heals many forms of sickness and chronic diseases. They may also believe that cooked food is harmful and that cooking foods destroys almost all healthy enzymes, a large part of vitamins and nutrients, half of the protein content of the food, and causes fats to become rancid