There is a guy on TV at the moment who weighs 345 kilos (759 lbs).

Its hard to feel sympathy for a guy who hasn’t walked in 7 years and yets sits in front of salad refusing to eat it and demanding a hamburger and soda…

After a bit of googling, it seems he died:

http://www.washingtonpost.com/wp-dyn/content/article/2005/09/20/AR2005092001841.html