Understanding Macronutrients: What Protein, Carbs, and Fat Actually Do

Protein, carbohydrates, and fat are called macronutrients because the body needs them in relatively large amounts. Each is made of different building blocks and serves a different primary function.

Protein is made of amino acids and is best known for supporting muscle repair and growth — relevant for teenagers who are active in sports or strength training, as well as for general growth during adolescence. Carbohydrates break down into glucose, the body's most readily available fuel, particularly important for the brain and for higher-intensity exercise. Fat, often misunderstood, is essential for hormone production, cell function, and absorbing fat-soluble vitamins (A, D, E, and K).

There is ongoing research and legitimate debate among nutrition scientists about ideal macronutrient ratios for specific goals, and needs vary by individual. What's well established is that severely eliminating any one macronutrient group without professional guidance is generally not recommended for growing teenagers.

This page reflects general nutrition science, not a personalized meal plan. If you have a specific performance or health goal, a registered dietitian can help tailor recommendations to you.