Advancing our understanding of how nutrition shapes human growth across the lifespan is essential for improving health outcomes. The Nutrition and Growth Yearbook 2026 delivers a rigorous synthesis of peer-reviewed studies published between July 2024 and June 2025, offering critical insights into the impact of diet on developmental milestones, pubertal growth, and skeletal and muscular health. Renowned experts provide concise summaries and expert commentary on the most significant findings, highlighting emerging trends, controversies, and future directions in nutrition and growth science. This volume bridges foundational research and clinical application, equipping professionals with evidence-based strategies to optimize care. Designed as a practical resource, the Yearbook supports translating evidence into actionable strategies and fosters continued exploration in nutrition and growth science across all stages of life.