This module covers the foundational principles and clinical applications of plant-based nutrition, including whole-food plant-based, vegan, vegetarian, and flexitarian dietary patterns. It explores nutrient density, bioavailability, anti-nutrients, food preparation techniques, and the role of the gut microbiome in adapting to increased fiber intake. The module also addresses weight management, nutrient absorption, and common challenges associated with plant-based diets. In addition, it focuses on the psychological and behavioral aspects of dietary change, including emotional eating, meal planning, flexibility, and sustainable lifestyle practices.