TCC Nutrition 101 Practice Test

Which nutrient yields the most energy per gram?

Carbohydrates Vitamins Proteins Lipids

Correct Answer:

Lipids

Explanation:

Energy density across macronutrients shows that lipids produce the most energy per gram. Lipids yield about 9 kilocalories per gram, which is higher than the roughly 4 kcal per gram provided by both carbohydrates and proteins. This higher energy yield comes from the chemical structure of fats, which contains many carbon-hydrogen bonds that release a lot of energy when oxidized during metabolism. Vitamins, in contrast, do not supply usable energy; they act as cofactors and helpers in metabolic processes rather than as calorie sources. So, among the options, fats deliver the greatest energy per gram.

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