Dietitians have a key role in the nutrition management of diseases and conditions such as diabetes, heart disease, kidney disease, gastrointestinal disorders, obesity, malnutrition, food allergy and intolerance. Dietitians are active in the prevention of many diseases and conditions through nutrition education, health promotion and advocacy. They help people understand the relationship between diet and disease, and use food to promote health, prevent disease and manage nutrition-related health conditions. Dietitians work in a range of fields including hospitals, private practice, community nutrition, public health, food service, research, teaching and training, writing, media, marketing and the food industry (including product development, food regulation, safety, consumer nutrition education and nutrition marketing).