The study of Biggest Loser contestants included people who (after they lost weight) were burning hundreds of calories LESS than a person of their weight normall

The study of Biggest Loser contestants included people who (after they lost weight) were burning hundreds of calories LESS than a person of their weight normally would be. (The average metabolic deficit in the study was 500 calories/day; the largest metabolic deficit was 800 calories/day) So no, it doesn't seem impossible for her testimony to be accurate at least approximately as given.