Which of the following substances has the highest amount of energy in joules per unit weight?

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

The correct answer is C. Fats

Fats and ethanol have the greatest amount of food energy per mass, 37 and 29 kJ/g (8.8 and 6.9 kcal/g), respectively. Proteins and most carbohydrates have about 17 kJ/g (4 kcal/g)

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