What are the three macronutrients and what role does each play in providing energy?
The three macronutrients are proteins, carbohydrates, and fats. Proteins serve as building blocks for muscle tissue and neurotransmitters, providing 4 kcal per gram. Carbohydrates are the brain's primary energy source, especially complex carbs that release energy slowly to prevent sugar crashes, also providing 4 kcal per gram. Fats support hormone production, cell membrane integrity, and absorption of fat-soluble vitamins, providing 9 kcal per gram.



