Fit to Fat to Fit

I saw this on GMA this morning and it was interesting.  His wife was mentioning as he gained weight he became "less helpful" than when he was fit.  It just seems to me slightly unrealistic to see someone endorsing this fast of a weight gain and loss.  I wonder what sort of idea it gives to people that have tried and failed endlessly as weight loss.

http://www.fit2fat2fit.com/ 

I didn't see the show -- just checked out the website -- but I don't understand why anyone would want to do this.  Am I missing something?

 
Part of an interview I saw on another news agency he or his wife said something to the effect of "Just to show how this weight loss is possible and possible in 6 months!"

It showed him eating entire boxes of mac n cheese and washing it down with coke in one clip.  Or digging into incredibly large cheese burgers almost as if he was on a 6 month gorge and then went to a six month direct opposite.  I don't understand the end game point of this.  I can't imagine this doctor supervised or not is realistic or healthy to do at all.

 I saw him earlier this year, and I think he said he wanted to see what his clients went through trying to lose weight. 
I don't know if his transformation is realistic though. Most people can devote their entire days to getting fit. 
I don't know. Maybe it did help him become a better trainer.

I have a friend who is obsessed with this website. I think this guy is a douche! He cannot "create" the experience people have who actually struggle with food and obesity.  Fit to Fat to Fit is RIDICULOUS!!! Augh! Don't get me started...