Iirc they estimate the kcal by blasting it with fire and seeing how much comes out. Or something similar. They don’t really get into how well the human body digests and uses it.
Nutrition labels take the into account how well macros are absorbed and even the calories burned to digest them (protein and carbs technically contain the same amount of calories, but protein is counted as less on the nutritional label because digesting protein burns calories).
If we still measured calories by burning food, then the calories on food with lots of fiber would be wildly inaccurate
Iirc they estimate the kcal by blasting it with fire and seeing how much comes out. Or something similar. They don’t really get into how well the human body digests and uses it.
No, that is incorrect.
Nutrition labels take the into account how well macros are absorbed and even the calories burned to digest them (protein and carbs technically contain the same amount of calories, but protein is counted as less on the nutritional label because digesting protein burns calories).
If we still measured calories by burning food, then the calories on food with lots of fiber would be wildly inaccurate
What I read is that they put humans in a bath and measured how much it warmed up or something like that, so it is supposed to be based on digestion