Because they are what our bodies have evolved to assimilate over countless ages. Heat changes the molecular structure of foods, rendering many nutrients unusable and destroying naturally occurring enzymes necessary for their assimilation. Cooking destroys / denatures proteins, fats and sugars and produces tran-fats and other dangerous compounds. In contrast, raw food adds energy and nutrients which are well accepted and virtually entirely useable by the body. Nature provides all the nutrients our bodies require – as it does for every other species on the planet.
Most people feel energized and healthier on raw foods. Thinking and emotional states improve. Digestive problems such as reflux and ulcers may disappear. Skin conditions clear. The immune system is activated, and people experience fewer illnesses. Most people lose extra weight, looking and feeling healthier.