They are extremely energy densed
Animal and vegetable fats serve as a concentrated energy source and are the highest energy sources in feedstuffs. Dietary fats and oils are a concentrated source of energy when compared to carbohydrate and protein, having over twice the amount of calories per gram. Fats contain 2.25 times the calories per gram than protein or carbohydrates. Fats contain 9 calories/gm while protein and carbohydrates contain 4 calories per gram.
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