Biology
Core Concepts in Nutrition
Quick fact
Your body gets energy from three macronutrients (carbohydrates, proteins, fats), but only two (carbs and fats) can be stored for later use—protein is primarily for structure and function.
Why this is interesting
You've heard 'you are what you eat,' but what does that actually mean? Your body is a complex machine that needs specific fuels and building blocks—how does it turn a sandwich into muscle and energy?