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The major nutrients—protein, carbohydrate, and fat—provide the body with energy. This energy keeps your heart beating, your brain active, and your muscles working. The energy is measured in calories. Nutrient Function Some sources Protein has 4...
Protein is made of building blocks called amino acids. Although the human body can make some of these amino acids, nine of them (the essential amino acids) must be obtained from food. Soy foods and animal sources of protein (milk, eggs, meat,...