I watch the show, I like it because it's sad as shit. Her character's a woman who's truly depressed and hopeless (and apparently unemployed... she's never been at a job on the show) because she's been morbidly obese her whole life and feels hopeless, will never find love and has some ripped sit-com start as her brother etc. She's tried everything to lose weight but can't and a couple points she just says "fuck it!" and pigs out like an animal. Like you said, she turns down a fat guy a couple times, then she falls for him and realizes she can be happy (still no idea how they fuck) and tries to get her life together with a fat camp and some other shit. Good message, I guess.

The show does a pretty decent job of presenting the picture that this isn't healthy and "don't accept being fat" and "only you can change your life, don't blame other people." Of course not everyone's going to see it that way. The other morbidly obese people who are fine being disgusting are looking to normalize this by doing "sexy" photo shoots and saying, "she's beautiful just the way she is!"

It's so twisted.