I watch the show, and I can't believe that doctors could endorse this type of weight loss.
It is much too much weight, too fast.

They will likely fall victim to the 'yo-yo' syndrom, when they are back in real life and don't have access to the exercise equipment for all those hours in the day.

I'd rather lose 1 lb a month for a year, and keep it off.

They are nice people, if not naive.
More courage than I have.

God help them.