Dietitians and nutritionists typically do the following: Assess patients’ and clients’ nutritional and health needs. Counsel patients on nutrition issues and healthy eating habits. Develop meal and nutrition plans, taking both clients’ preferences and budgets into account. A nutritionist is a person who advises others on matters of food and nutrition and their impacts on health. Some people specialize in particular areas, such as sports nutrition, public health, or animal nutrition, among other disciplines.