Discussion
Complete combustion of 1 gram of carbohydrate (glucose) in the body yields ..................... kilocalories of energy.
Answer: B
One gram of carbohydrate yields about 4.2 kilocalories.
When carbohydrate is completely oxidised, in a bomb calorimeter or in the body, it releases about 4.1-4.2 kcal per gram, which nutrition tables round to 4 kcal per gram (the Atwater factor). Protein yields about the same in the body.
9.0 kcal per gram is the energy value of fat, and 7.0 kcal per gram that of alcohol. 2.0 kcal per gram is far too low for carbohydrate.
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