In order to carry out the policy of this subchapter, the Secretary shall develop and implement a national food and human nutrition research and extension program that shall include, but not be limited to—
research on human nutritional requirements;
surveillance of the nutritional benefits provided to participants in the food programs administered by the Department of Agriculture;
research on the factors affecting food preference and habits; and
the development of techniques and equipment to assist consumers in the home or in institutions in selecting food that supplies a nutritionally adequate diet.