What Macros Are and Why They Matter

This lesson introduces the idea of macronutrients and explains why they matter for everyday health, energy, and body function. Professor David Grant sets the foundation by defining protein, carbohydrates, and fats, showing that each plays a different role and that none should be viewed in isolation.

You will learn how macros differ from vitamins and minerals, how they contribute calories, and why people often track them when changing body composition, improving fitness, or planning meals more deliberately. The lesson stays at a foundation level, preparing you for the deeper study of protein, carbohydrates, and fats in later lessons.