A dietitian is a healthcare professional who specializes in providing advice and guidance on food, nutrition, and lifestyle choices to promote optimal health. They use their knowledge of science-based nutrition to develop personalized meal plans for individuals or groups, taking into account factors such as age, gender, medical conditions, and cultural preferences. Dietitians work in a variety of settings including hospitals, schools, long-term care facilities, and private practice. They may also provide education and counseling on specific dietary needs, such as managing chronic diseases like heart disease or diabetes, weight management, or sports nutrition.