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Former Biggest Loser contestants fight slow metabolisms, weight gain | Ars Technica

arstechnica.com/science/2016/05/big-weight-loss-can-slow-metabolism-long-term-make-it-harder-to-stay-slim

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Saved with the link. Notes from 2007 to 2016 are mostly the page's own words, so this is probably an excerpt.

Six years later, only one of the contestants weighed less than they did after the competition; the other 13 contestants had gained back sizeable amounts. Five contestants regained almost all of or more than the weight they lost. But, despite the weight gain, their metabolic rates stayed low, with a mean of 1,903 +/- 466 kcal/day.