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Despite that, someone becoming physically larger would necessitate a higher metabolism. Otherwise, people would lose involuntary bodily functions. Organ function would crash. So any notion that people gained massive amounts of weight with no change to metabolism would mean two things:
1: They would die. Pretty quickly.
2: If they didn't die in some weird parallel universe in which metabolisms stay static despite the size of the body, they would perpetually gain weight at a steady, unyielding rate.
Neither of those things seem to be happening, so the study is probably junk science.
A changing metabolism is not the issue at hand though.
The issue at hand is that their metabolisms would normally be expected to rise after coming off the show, and they haven't. In fact, some have slowed even more, and the contestants have been show to have a significantly slower metabolism than the average person their own weight.
You can see by the graph in the article that even as their weight increased, their metabolism actually dropped. That's not what should happen.