How calories value of different products is calculated?
In: Other
There’s a very scientific test that involves seeing how much a specific food will change the temperature of water when ignited but most companies don’t do this and rely on the fact that it is has been found that there are 4 calories in a gram of protein, 4 calories in a gram of carbs and 9 calories in a gram of fat. Then they just multiply and add those things together and are usually within 10% of the actual value. In the US, the FDA allows for a 20% margin of error in either direction, so.
Edit: if you grabbed a nutrition label and noticed this is slightly off, I think it’s because if something really has like 9.4 grams of carbs, they just write 9 (in the US, I have seen that they include decimals on Italian nutrition labels), but I’m not sure.
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