Energy and nutrition

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.

  • Protein has 4 calories per gram. (A gram is a measure of weight. There are 28 grams in 1 ounce.)
  • Carbohydrate has 4 calories per gram.
  • Fat has 9 calories per gram.

Last Updated: February 6, 2009

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