Each macronutrient has a different role in the body and contributes in a different way to health, energy, and the feeling of fullness.
Protein is essential for maintaining and building muscle mass, tissue repair, and the proper function of many systems in the body. It also plays an important role in feeling full.
Carbohydrates are the main source of energy for the body and brain. They're especially important for physical activity and concentration.
Fats are necessary for hormone production, cell health, and the absorption of fat-soluble vitamins.
Each macronutrient gives a different amount of energy:
1g protein ≈ 4 calories
1g carbohydrate ≈ 4 calories
1g fat ≈ 9 calories
The balance between these nutrients plays an important role in both health and how we feel every day.