Question

Which of the following nutrients has the highest calorific value?

• A. Carbohydrates
• B. Proteins
• C. Fats
• D. Vitamins

Answer 1

The correct option is C

Fats

The correct option is : C.

Explanation of the correct option:

1. Calorific value refers to the amount of heat liberated from the complete combustion of 1 g of food or fuel in a bomb calorimeter.
2. Calorific value is the amount of energy available from an item of food when digested, mostly from carbohydrates and fats.
3. It helps us to know the amount of energy required to carry out day to day activities.
4. The highest calorific value is also known as gross energy or gross calorific value.
5. The gross calorific value of fats is 9.45 kcal/g, for carbohydrates, it is 4.1 kcal/g and for proteins, it is 5.65 kcal/g.
6. So. we can see that per gram calorific value of fats is greatest, then carbohydrate and then protein.

Explanation of the incorrect option:

Option A :

Carbohydrates are the source of energy required by our body, even though it has less calorific value than fats , i.e. 4.1 kcal/g .

Option B :

Proteins are also the source of energy required by our body, having calorific value of 5.65 kcal/g.

Option D :

Vitamins are required by our body for proper functioning and protecting organs and do not have any calories.

Final answer : Fats has the highest calorific value