Individuals who plan food and nutrition programs and supervise the preparation and serving of meals. They help to prevent and treat illnesses by promoting healthy eating habits and recommending dietary modifications such as the use of less salt for those with high blood pressure or the reduction of fat and sugar intake for those who are overweight. Dietitians manage food service systems for institutions such as hospitals and schools; provide dietetic and nutritional services for individuals served by public health clinics, home health agencies, health maintenance organizations or their own private practice; promote sound eating habits through education; and conduct research.