Question

A pound of plain M&M® candies contains 96 g fat, 320 g carbohydrate, and 21 g protein. Table 5.5: Compositions and Fuel Values Fuel Value kJ/g kcal/g(Cal/g) Carbohydrate 17 4 Fat 38 9 Protein 17 4 What is the fuel value in kJ in a 51-g (about 1.8 oz) serving? =1100kJ How many Calories does it provide?

Answer 1

1) In KJ

One gram of fat produces 38 kJ of energy, while one gram of carbohydrates or one gram of protein would each produce 17 kJ of energy. Therefore, one pound produces:

96*38 + 320*17 + 21*17 = 9445 KJ per pound

1 pound = 453.592 g

So, fuel value for 51 g = 51 * 9445 /453.592 = 1061.96 KJ ....Answer

2) In calories;

Calories per pound = (96* 9) + (320*4) + (21*4) = 2228 Cal

Fuel value for 51 g = 2228 * 51/453.592 = 250.51 Cal

Let me know if any doubts.