If you want nutrition you need to eat food. In order to live, the science of nutrition shows that everybody needs food to function, grow and heal.
Even though location and family traditions play important roles in forming dietary habits, food choices differ from person to person. To a high level, what people consume affects their health and their enjoyment of life. In turn, healthy habits and a happy outcome can improve the ways in which the human body makes use of what it consumes.
With the help of the sun, plants produce their food from chemicals in the earth, water, and air. Animals, including humans, cannot produce their own food. They must eat plants, other animals, or both.