Someone who studies, or who is an expert, in the field of healthy eating: In a hospital, or nursing home, a nutritionist is a person who plans and/or formulates special meals for patients.

Nutritionists can help patients with special needs; such as, devising healthy diets to control allergies, health problems, a desire for increased energy, or weight changes.

Some nutritionists in private practices are well-trained, hold a degree, and are licensed; however, depending on state law, a person using the title may not be trained or licensed at all.