Energy in 1 food Calorie (kcal)

Energy in 1 food Calorie (kcal) (4.2 kJ)

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Neat Ratios ...

Energy in 1 food Calorie (kcal) (4.2 kJ)

is 1/4 of Energy released by metabolising 1g of carbohydrate (17 kJ)...more
is 1/4 of Energy released by metabolising 1g of protein (17 kJ)...more
is about as big as Energy released by exploding 1g of TNT (4.2 kJ)...more

If this was a standard unit ...