First, to rebuild tissues that are constantly being wasted; second, to furnish energy either as heat or as muscular work.

For people of good health and with good digestion there are two important rules to be observed in the regulation of the diet. The first is to choose the things which "agree" with. These are essential to health as nutrition would be deficient without them, and therefore it is well to see that they are always present in our daily food. The fats and hydrocarbons very largely furnish the energy you use.

Among these are calcium, iron, magnesium, phosphorus, sulphur, chlorine, potassium, sodium, and many others. The tissue builders are protein lean meat, fish, egg albumen, casein of milk, wheat gluten, and the protein portion of vegetables. With the exception of sodium chloride(com table salt), an average mixed diet furnishes a sufficient quantity of minerals for the needs of the body. In foods there are various minerals beneficial to the system.

Vitamins and minerals are essential for the development and maintenance of abdel and for the important part it plays in the waste and repair of all tissues of the body.