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[–] theepilepticferret 0 points 1 point (+1|-0) ago 

But when you diet, your body becomes more fuel efficient, burning fewer calories to accomplish those same tasks. It goes from being a Hummer to being a Honda Civic, in terms of fuel consumption. And that fuel efficiency can be permanent.

Fucking duh? If you go from a 300-pound landwhale to a 130-pound human, of course you are going to need fewer calories to maintain a lower mass. Fat isn't an inactive tissue; it needs a blood supply and secretes hormones. All that requires energy in the form of calories. So of course once you get rid of all the extra fat, your body doesn't need that energy anymore... so your BMR goes down.