What Do Dietitians and Nutritionists Do? Dietitians and nutritionists are experts in food and nutrition. They advise people on what to eat in order to lead a healthy lifestyle or achieve specific health-related goals. Dietitians and nutritionists try to prevent health problems and aim to treat health problems by helping people develop better eating habits. They often work with patients who have heart disease, high blood pressure, diabetes, eating disorders, …Read More