Unless you’re a complete moron, you know that any “reality TV” bears little resemblance to reality. The 5 Details They Cut from My Season of ‘The Biggest Loser’ show nicely just how much telling the story overrode “reality”.
And sometimes the “healthy habits” you saw on the show were no such thing: My season made a big deal of showing us all drinking our milk to prove how nutritious it was. But as soon as “cut” was yelled, the trainers made us spit it out. Calories do not trump calcium, apparently.