This document provides an overview of nutrition, defining it as how food affects health through macronutrients (proteins, carbohydrates, and fats) and micronutrients (vitamins and minerals). It emphasizes the importance of a balanced diet for overall wellness and highlights the role of dietary fibre and water in supporting bodily functions. The text also discusses the alarming rise of lifestyle-related diseases in India and the growing wellness industry that focuses on preventive health measures.