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They determine the food's ratio of protein, carbs, and fat per weight and then just multiply (protein and carbs have 4 calories per gram, fat has 9).
But apparently, before they figured that out, they would actually burn the food and measure the heat output. After all, a calorie is nothing but a measure of heat energy.
How do they figure out calories on a package of food?
Edited by: HSAGE1212 at: 10/5/2007 (12:47)