Professor Luis Moreno discusses the important role of complementary feeding in preventingchildhood obesity, highlighting the need for timely introduction to support healthygrowth and reduce long-term obesity risk. The discussion explores how early or delayedintroduction of solids, consumption of high energy-dense foods, and excessive animalprotein can increase adiposity, while nutrient-dense, fiber-rich foods and early vegetableexposure foster healthier habits. The episode further reviews mixed evidence on baby-led weaning, the influence of complementary feeding on gut microbiota, and the needfor parental education to guide portion sizes and food choices. Key preventive strategieswere emphasized including promoting breastfeeding, ensuring balanced nutrient intake,and aligning feeding practices with developmental needs to establish lifelong healthyeating patterns and reduce obesity-related health burdens.