Defining the nutrition problems in society, prevention of diseases and to examine the relationship of diet and nutrition in the etiology, the creation of special food for the community and the protection of the health and nutrition plans and policies developed in the group. (Eg. School children, the preparation of dietary guidelines for adults) Food and nutrition policy, nutrition problems and epidemiology, protein-energy malnutrition, protection of breastfeeding, encourage and support, monitoring of growth, obesity, chronic diseases related to diet, physical activity and health, iron deficiency anemia, iodine deficiency diseases, dental caries, zinc deficiency, rickets, osteomalacia, osteoporosis, vitamin deficiencies of folic acid deficiency, workers, elderly nutrition, disasters nutrition, food fortification and nutritional support (supplementation), guides, national food and nutrition plans and policies.