A human body is always at work-whether awake or asleep

Why is food necessary for human body?

Human being exits on foods. A human body is always at work-whether awake or asleep. When a man is walking, eating, talking, driving a car, we say he is at work since hit activity is clearly visible. But even when he is asleep he is working for, although he may be

at perfect rest, many parts of his body are working. His heart is throbbing, the blood is circulating, and the process of digestion is going on. It is a common scientific principle that energy is consumed whenever any action takes place. So also for man’s activity energy is required. This energy is provided to man through the food he takes. Thus food is the source of energy for a man; in the same way as the fuel is the source of energy for a steam engine. The food provides fuel for the human engine. It is changed so that it can dissolve in the blood and a very slow process of burning takes place in the human body. The energy that is thus released helps the human body to perform functions and the heat keeps the body warm. Thus the main functions of the food can be summarized as follows:-

1. It supplies the energy for doing work and keeping the body warm.
2. It makes good the wear and tear of every day life.
3. It provides necessary substances for the growth of the body.

4. It helps to survive a human.