RD stands for Registered Dietitian, a healthcare professional who specializes in nutrition and dietetics. A Registered Dietitian is responsible for providing advice and guidance on food and nutrition to individuals and groups. They assess nutritional needs, develop meal plans, and provide education on healthy eating habits. AVES is an acronym for Accredited Verified Education in Nutrition and Dietetics, which is a program that provides specialized training and education for Registered Dietitians. STS stands for State Testing Services, which is a certification exam that Registered Dietitians must pass in order to become licensed in their state.