Diet for Athletes in training. Diet for Brain Workers. Starvation. Diet in the Different Periods of Life.

It is self-evident that a larger amount of fuel or of calories - that is, units of energy - will be needed by those who are working hard than by those who are doing but little physical work. The tables in Chapter V (Quantity And Kinds Of Food Needed In Health) illustrate the differences in the amount of food consumed by different classes of workers because of the different demands that their systems make and that are expressed by their appetite. However, the appetite is not always a good guide to the amount of food or kind of food that should be eaten. It is often capricious. It is commonly governed by habit, and therefore does not quickly adjust itself to varying modes of life. For example, many men who have worked hard during early manhood and middle age, when they needed a large amount of food, continue to eat as heartily after they give up such work and begin to lead a life of leisure. At the end of the tables on pages 46 and 156 is given the estimated amount of food needed by those doing various kinds and degrees of work.