DEAR DOCTOR K: I heard about a recent study that explained why the "Biggest Losers" had trouble keeping the weight off. Can you explain?
DEAR READER: You're likely referring to a study done at the National Institutes of Health (NIH). As many readers will recall, NBC television put on a competition reality show for several years, beginning in late 2004. Extremely overweight people competed to see who could lose the most weight, through diet and exercise, over 30 weeks.