Increasing demand for food from a growing human population is leading to adverse environmental and health consequences. The emerging topical issue of sustainable eating and diets might offer new opportunities for the training of nutrition professionals. Ongoing research is uncovering synergies between how dietary patterns can meet both health and environmental goals. Yet this area is a challenge for the nutrition professions, as relevant education often involves politically driven, systems leadership‐style thinking, which is drawn from a less familiar evidence base than traditional nutritional sciences. As pressures mount to achieve sustainability agenda goals, new evidence appraisal and educational input are essential to support the potential role of nutrition professionals. This article appraises sustainable eating and diets, as well as considering the value of better education to be embedded more consistently within nutrition curricula and Continued Professional Development (CPD), to achieve sustainability literacy for nutrition professionals. The importance of stronger advocacy skills and collaborative leadership is also highlighted, as well as the need for more effective high‐level policy involvement. Recommendations for how nutrition professionals can be more effectively equipped for this emerging and dynamic area of professional practice are provided.