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The heat energy produced when the human body metabolises 1 gram of fat is

  • A.30 kj
  • B.1 kj
  • C.39 kj
  • D.29 kj

Answer: C

Metabolising one gram of fat releases about 39 kJ, roughly 9 kcal.

Carbohydrate and protein yield about 17 kJ (4 kcal) per gram, so fat provides more than twice as much energy for the same mass. That density is why the body stores its reserves as fat rather than as glycogen.

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