Dietitian/ˌdaɪəˈtɪʃn/ Definition 1 of 1Pro Tip 1/3Medical Professional Dietitians are certified health professionals who specialize in food and nutrition. My doctor recommended a dietitian to help with my meal plans. Pro Tip 2/3Beyond Weight Loss Dietitians do more than help with weight loss; they assist with various medical conditions. The dietitian provided a diet plan for my type 2 diabetes. Pro Tip 3/3Consultation Context The word 'consult' often appears with 'dietitian' when seeking their professional advice. I’ll consult a dietitian to improve my athletic performance.