GMAT Critical Reasoning (CR) | Researchers have found that when very overweight people, who tend to h

Researchers have found that when very overweight people, who tend to have relatively low
metabolic rates, lose weight primarily through dieting, their metabolisms generally remain
unchanged. They will thus burn significantly fewer calories at the new weight than do people whose
weight is normally at that level. Such newly thin persons will, therefore, ultimately regain weight
until their body size again matches their metabolic rate.

Which of the following if true is most damaging to the conclusion
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