Explain why some foods have more
calories per gram than others.

Another part of the reason that foods have different calorie levels is that the energy-providing nutrients supply different amounts of energy per gram. Fats supply the most energy at 9 calories per gram. Carbohydrates and proteins each provide 4 calories per gram for use as energy in the body.

Explanation:

energy-providing nutrients supply different amounts of energy per gram. Fats supply the most energy at 9 calories per gram. Carbohydrates and proteins each provide 4 calories per gram for use as energy in the body.

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