Penn Jillette
Whilst Penn, from magician duo Penn & Teller, is extremely tall, his weight of 322 pounds was unhealthy and poor eating habits had led to a 90% blockage in the arteries in his heart. Drastic measures need to be taken to turn his health around. He embarked on a 14-day potato diet and then added vegetables after that. So far, he is 100 pounds lighter.
Adam Richman
Man Vs Food star, Adam, eats, sleeps and well..eats food. He cannot get away from it. He did, however, realize he needed to change his relationship with food to improve his health, as he did tend to overdo it. He went Vegan and now looks like a changed man.