
Some of the principal foods containing a large amount of protein are: meat, eggs, fish, cheese, beans, pulses, milk, nuts and soyabeans.
Between the periods of infancy and maturity, protein is required both for growth and repair. After maturity, the sole use of protein is for repair. Unless one is doing outdoor work or taking active exercises, the protein ration should be small, because protein, when taken in excess of the actual needs of the body for its tissue building, is not only useless-not being necessary to satisfy any bodily need, but causes positive damage to the body.

So we may include here the remark made by Professor Chittanden that "Voit, among others, has clearly emphasized the general principle that the smallest amount of protein, with non-nitrogenous food added, that will suffice to keep the body in a •state of continual vigour is the ideal diet."