Starting a career with a hospital gives a nutritionist many kinds of job choices in the medical field. A hospital nutritionist will either work with all different types of patients or specialize in working with a specific age range or with patients with a specific disease, such as kidney disease or cardiac disorders.ypes of Jobs As a Nutritionist. Nutritionists help people learn how to eat foods that benefit health. Photo Credit Hemera Technologies/Photos.com/Getty Images. The field of nutrition is booming as more Americans develop an interest in learning how to eat healthy to achieve a long life.