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[–] Raylan ago 

And on top of that food composition databases are far from perfect. It's really hard to accurately assess what's actually in the food, what gets absorbed and what gets, well, shat out. It's not like we have some fancy sci-fi tool that scans the food (or the crap) and tells us its precise composition. That's not a real problem for general weight loss or to get them gainz, because then a little guess work is fine, but it is a problem when you want to test scientific hypotheses. Questionnaires and food databases suck; we need a fucking tricorder.