Digestive enzymes are responsible for breaking down dietary compounds such as proteins, carbohydrates, and fats into simpler components in order for the body to absorb the important nutrients more easily. They are produced within the gastrointestinal tract.
There's an old African saying that goes 'food is food. It may not make any sense when read as is, but when the emphasis is placed on the fact that we not only eat for the fun of it, but for the sake of our health and survival, it makes perfect sense.