So far, this chapter has consisted almost entirely of what to do and has said almost nothing about why to do it. This is because I want to provide workable rules and ready facts about foods for the many people who are not interested in proteins, vitamins, calories, and so on but do want to eat the proper foods. Information on these and many other related topics can be found in the encyclopaedia section. (A good place to start is the entry on diet.) However, I would like to make a few remarks about the reasons for a well-balanced diet. First, you should remember that food provides the body with four essentials:

Energy

Repair materials

Growth materials—from infancy through the period of active growth

Vitamins and other special substances

Usually, your appetite will tell you just how much food your body needs. This indicator is so sensitive that some people go for years at almost precisely the same weight. If more food is taken in than is needed for fuel, building, and repair, the body stores it as fat. If too little food is consumed, the body burns its reserves of fat and protein.

*19\68\2*

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