I think we have to remember that part of Jenni's motivation is that she does not want her dad to die, and she feels she is trying to save him. My dad had a quad bypass, and though it is very rare, I want to slap him when he eats a bratwurst. I think she was trying to save him as much for herself as for him. When fear is your motivator, it is hard to provide the best kind of support. You hate to say the words, "I don't want you to die, but it seems like it matters more to me than to you, and I hate that about our relationship." Much easier for her to express her anger in less raw ways.
I have little sympathy for the purple team. They are fat camp counselors? They already have the tools for making changes. They should know most of this already.
Eating the best food in the worst portions.