Nightingale Nutrition Practice Exam

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A serving of food contains 10 grams of carbohydrate, 2 grams of protein, and 4 grams of fat. Based on this information, a serving of this food supplies ____ calories?

64 calories 84 calories 72 calories 100 calories

Correct Answer:

64 calories

Explanation:

Macronutrient energy values are fixed: carbohydrates and protein provide about 4 kcal per gram, while fat provides about 9 kcal per gram. For this serving, the energy contribution is 10 g carbohydrate × 4 = 40 kcal, 2 g protein × 4 = 8 kcal, and 4 g fat × 9 = 36 kcal. Add them up: 40 + 8 + 36 = 84 kcal. So this serving supplies 84 calories.

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