4 calories
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When 1 gram of carbohydrate is oxidized, it produces approximately 4 kilocalories (kcal) of energy.
The energy value of a carbohydrate molecule is around 4 calories per gram, while a fat molecule has approximately 9 calories per gram. This means that fats provide more than double the energy compared to carbohydrates on a gram-per-gram basis.
One gram of starch provides approximately 4 calories of energy. Starch is a complex carbohydrate that gets broken down into glucose during digestion, which the body uses as a source of energy for various metabolic processes.
Carbohydrates and proteins provide 4 calories per gram, while fats provide 9 calories per gram. Alcohol provides 7 calories per gram.
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Ethanol contains about 7 calories per gram.