Aren't they only "surviving" in front of the cameras and behind the scenes they're fed, hydrated etc?
I like Survivor. yggdrasil....They don't go without food or water on the show anyways. They always have water. And even if the only foods they are eating is rice and coconuts they are never starving. And they do always lose a bunch of weight ... I doubt they are eating large amounts of food behind the scenes. The show is not about survival. It's just about surviving the game.