How do they measure macros / nutritients in foods

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How do they measure macros / nutritients in foods

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I dont have time to go into depth, but I’ll give you an example of how calories are measured. The food sample of known mass is placed in something called a bomb calorimeter. The food is incinerated and the amount of heat released (or if it’s sumberged in water, the increase in water temperature and the energy needed to heat the known mass of water that much) allows the researchers to determine exactly how much energy (calories) are in the food.