Being fat IS a serious illness. In fact, obesity was recently recognized as such by the AMA. What it's doing to you, even though you can't see or feel all the effects immediately, is horrible. It's not like you get a warning letter before you become diabetic, it is a fairly stealthy process, most people miss it until it's too late. Same with heart disease, and clogging and hardening of the arteries.
http://www.nytimes.com/2013/06/19/bu...ease.html?_r=0