shminux comments on Solved Problems Repository - Less Wrong
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Probably not as much as excreting all the unprocessed food from the other end.
That's not true. Most of the material in bowel movements was never in your fat to begin with.
Indeed not from burning calories, sorry. However, it still has to be subtracted from the intake, just like the amount you exhale, so reducing absorption is just as important as increasing burning.
Is this actually true? Do you have a citation for this?
Actually, I could not find any data online on the food energy utilization in the small intestine in humans and on the factors affecting it. Apparently the obvious ways to prevent absorption, like laxatives, don't really work in the long term.