In his second talk Professor Mottram divides food into three types, growth, protective and fuel, to each of which groupings one talk in the series is being allowed. He shows that mixing of foods is essential, as one form of food can, as a rule, only produce one sort of result, and there are three results which it is necessary to obtain from one's food, i.e., growth, protection, and warmth and energy; and it is imperative to regulate the rate of growth in the right relation to the production of energy.