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Nobody in their right mind uses calories
Although not generally realized nutritionists actually have been
measuring energy in joules
The Committee on Nomenclature of the International Union of
Nutritional Sciences concluded that most nutritionists use the
thermochemical calorie which equals 4.1840 J exactly.
The thermochemical calorie actually approximates a "17° calorie"
in contrast to the "15° calorie".
I have no idea where the 4.184 J value comes from. There is probably
some interesting history, but I don't know it.
The original published source defined the Calorie as the quantity
of heat needed to raise the temperature of 1 kg of water from 0 to
1°C.