While we are all talking about eating better and having overall better health, this article should be even more of an inspiration to keep on the right path:
This previously health conscious guy ate McDonalds for 3 meals a day for 30 days as an experiment (and subject of a documentary). While most of us here know the consequences of those eating actions, it really demonstrates why the American population is bulking down and chunking up.
The most interesting (but not surprising) quote I saw was this:
His liver became toxic, his cholesterol shot up from a low 165 to 230, his libido flagged and he suffered headaches and depression.