Carbohydrates, proteins and fats in the foods provide energy for the
body functions and physical activities. They, however, do not have
same energy content. The following is the energy-content by
respective nutrients: 1 gram of carbohydrates- 4kcal 1 gram of protein- 4 kcal 1 gram of fats- 9 kcal
So, the correct answer is '4.2 kcal'
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