I couldn't survive on a damn island for that long, I am 115 lbs and I don't need to lose any weight so that rules out the CBS show. The rest of the shows are just too much for me.
Competitive shows that require being stuck on an island & not being able to eat would suck. I'd have to got with Real World or Big Brother. But Real World is more fake now than it was when I was growing up, I choose Big Brother.