It was originally just a way to measure food supply in a way to ration it and use science to justify the very low calorie intake of prisoners of war, for example. It was a way for some governments to claim that they were feeding nutritious meals to prisoners. However, in truth their prisoners were receiving too few calories and the rations were starved them to their death. For example, Jews under the rule of Hitler received only 200 calories a day.
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70 percent of 2500 calories is 1750 calories.
1 kelvin to calories
There are 4 calories for every gram of carbohydrates. There is also 4 calories per gram of protein and 9 calories per gram of fat. Finally there are 7 calories per gram of alcohol.
About 90 calories.
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