ATP ←--- ADP + Phosphate Radical + Energy
A food is any substance utilized by a living thing for energy (or for growth and
a. There are both plant and animal sources for foods. One can eat grains in the
form of bread, and one can eat the meat of an animal that ate such grains.
b. Making up foods are specific substances known as foodstuffs. In general,
foodstuffs are in three categories:
(1) Carbohydrates (starches and sugars).
(2) Lipids (fats and oils).
c. In addition, other necessary items are also parts of foods. These include
water, minerals, vitamins, and so forth.
d. In the human digestive system, the following processes are involved:
(1) Ingestion (taking in) of foods.
(2) Initial processing.
(6) Elimination of unused materials.