WJEC Food Science And Nutrition Level 3 Practice Test

How many calories are in one gram of fat?

3.75 kcal 4 kcal 9 kcal 2 kcal

Correct Answer:

9 kcal

Explanation:

Fats store the most energy per gram among the main nutrients. Their chemical structure holds a lot of energy in the carbon–hydrogen bonds, and fat contains relatively little oxygen, so when it’s metabolized a large amount of energy is released. The standard energy yield used in nutrition is about 9 kilocalories per gram for fat. In comparison, carbohydrates and proteins provide roughly 4 kcal per gram, and alcohol about 7 kcal per gram. So the correct value is 9 kcal per gram.

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