Raw foods, fruits and vegetables, are excellent sources for enzymes. When food is processed, canned or cooked, enzymes are destroyed. Supplementation with enzymes replaces those lost in cooking an enhances the enzymes found in raw foods. Naturally occuring enzymes and supplemental enzymes begin the process of digestion earlier in the digestive tract. Without these enzymes, digestion occurs in the small intestine. The chance of undigested food entering the colon is increased. Incomplete digestion of food gives colon bacteria the opportunity to feed, producing gas and toxins that can leave people feeling uncomfortable and even sick.