Enzymes are substances found in all living cells. They act as catalysts in chemical processes, such as metabolism, and are part of the breakdown and regenerative process of life. Plant foods, for example, contain enzymes which are needed to break down that specific plant. Animals also produce enzymes to break down the foods they eat. These are called digestive enzymes. Unfortunately, many of the processed foods we eat are lacking necessary enzymes. Some people may benefit from taking natural enzymes with meals to help digest food.