Just got off the phone with a producer from The Learning Channel. There's no guarantee that I'll be chosen of course, but so far our email and phone conversations have been promising. I'm also left with the sense that they're not out to mock or discredit anyone, just to portray people with interesting diets in an episode of their series that focuses on diet.
My contact offered a link to a past episode on Vimeo (nothing to do with diet, it was about people who had unusual collecting habits, like antiques, disney paraphernalia, etc.), and when I watched it I definitely got the impression that they were not out to portray people in a negative light. She said that the vast majority of those who've participated in the past were very happy with how they were portrayed. This also gives me confidence.
If I end up being chosen, I'll let folks know. Filming will take place in late August or early September (2012), and the episode would likely air on TLC sometime in spring of 2013.