In recent years in many countries of the world a great deal of attention has been directed toward the need for more nutritious diets. The term “protective” foods has become established in the literature on nutrition. While there may be some differences of opinion as to what constitutes protective foods, practically all the lists of such foods which have been prepared by nutritionists include milk, meat, eggs, cheese, and fruits and vegetables.

The first studies of consumption of agricultural products in Canada were made by the Economics Division of the Dominion Department of Agriculture in 1930 when by the use of mail questionnaires a survey was made of the purchases of apples by consumers in Toronto and Montreal. A year later the first study of milk consumption in Canada was made by the Economics Division in the Sydney-Glace Bay area of Nova Scotia and in 1935 a more comprehensive study of milk consumption was undertaken in a number of urban and rural areas. Since 1935 additional studies of consumption of foods of various kinds have been made by the Economics Division as well as by other agencies. Most of these studies have been in relation to protective foods which in the main are the more expensive kinds of foods. These studies have been largely confined to city people although information has been gathered on the use of certain commodities in rural Canadian homes.