Question

One of the reasons we eat food is to gain energy. How can we calculate the amount of energy that a food contains?

Answer 1

Answer:

By calculating the total calorific value of each food ingredients

Explanation:

Food’s energy content is due to its calorific values or the amount of calories it it. Carbohydrate, protein and fat are the major constituents of a food. Suppose, the amount of carbohydrate, protein and fat intake in an adult is  equal to X, Y and Z grams  

In one gram of carbohydrate , protein and fat there are 4 , 4 and 9 calories per gram  

Thus, the total calories in the food of adult will be equal to  

$(X * 4 + Y * 4 + Z* 9)$ calories