Current systems of food production and consumption are challenged by factors such as natural resource constraints, relative unaffordability of nutrient-dense foods, persistent social inequities, and high rates of diet-related disease. Registered dietitian nutritionists (RDNs) play a critical role in protecting the health of current and future populations by advancing sustainable, resilient, and healthy food and water systems. By definition, such systems can meet current dietary needs without jeopardizing the ability to meet the needs of future generations; can withstand or adapt to disturbances over time; and can equitably facilitate disease prevention and well-being for all individuals.