Susan Levin is the director of nutrition education for the Physicians Committee for Responsible Medicine (PCRM), and a registered dietitian specializing in sports dietetics. Every 5 years, the Dietary Guidelines for Americans are updated. She discusses the PCRM's recommendations for these guidelines: No low-carb eating patterns, recommend water instead of milk, warn against consuming red and processed meats, and promote plant-based eating. Susan also discusses 4 ways the vegan diet is optimal for athletes.