These foods should supply a part of the day's energy. Fat seems to be necessary for two reasons: because it helps to regulate the rate at which food passes along the digestive tract; and because certain fats are carriers of a body-regulating substance necessary for growth. Children particularly need this type of fat.

Fat-rich foods which carry growth-promoting substances are: milk, cream, butter, eggs, cod-liver oil, meat fat, to a certain extent, and fat in soybeans.

Other fat-rich foods are: bacon, lard, drippings, fat meats, vegetable oils or food rich in oils.