this post was submitted on 23 May 2024
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We can't even measure calories accurately, never mind predicting how much your specific body will actually absorb. Maybe we could be more accurate with vitamins and stuff, but I dunno.
What? Calorie is a perfectly accurate method of measurement. Just because your body might absorb more or less than the next person doesn't change the amount of calories in a food.
Measuring calories in food is not accurate. Measuring calories by burning fuel is, but that's not how we use food.
Lmao so measuring calories in food isn't accurate cause you don't consider it food when measured?
That's gotta be the funniest counter argument I've ever heard
I think he's saying that you can measure how much energy the food contains but not how much energy each individual will successfully absorb and metabolize.
Nah,, that's the funniest attempt at dissing someone that said something you don't understand I've ever seen.
Calorimeters do a specific job. That job is not the same as digestion and metabolism. Not all foods "give up" calories in the same way, and no foods do so in the same way as inside a calorimeter.
Measured calories via calorimeter are indeed accurate with exactly what they measure, i.e. The exact food that is placed into them.
What a calorimeter can't do is guarantee that everything put into it is the same.
The more complex the substance is, the more variation there will be between measurements of different batches of that substance. Something like refined sugar is going to give the same results reliably because there's just not that much variation. Same with refined fats and proteins. Once you get simple enough, the results vary by so little as the be meaningless.
Put two bananas in the same machine, the variance will be greater than that of simpler materials. Is that variance enough to matter on a practical level? Not usually, but it can be.
But, that variance is still there, and the range of possibilities is enough to be significant when calculating what you might slap on a nutritional level of a given food.
Hence, the results aren't accurate in the sense that they can be reproduced in a precise way. There's just too much natural variance in foods, even carefully prepared foods.
While what you said isn't wrong, it's not really the main issue. The energy a human body gets from food can be vastly different than what is produced by burning it, and there are further variations per person.
The calorie count on food to my knowledge is based on actual measurements with humans... from one guy doing experiments in the 1800s. And while it's probably reasonably accurate on average, it's not really possible to know how much energy a specific person will get from a food from a generalized calorie label. So even if the food itself had no variance, it would be impossible to label the energy intake you will get from it accurately.