What do you think are the reasons for the steadily increasing amount of obese people in the US?

I would say that some of it has to do with laziness. People don't want to go exercise and would rather stay home and watch t.v. Also people don't want to cook and fast food is fast and it's cheap and a lot of people don't have very much money right now. And come on, we all know how much better a giant hamburger from mcdonalds and fries, large sweet tea and all of it for less then $5 and 5 minutes sounds then going home having to spend 30 minutes cooking and eating vegetables and everything. I don't agree with this of course, since I think that most people could eat better. Some people say that it has to do with being depressed and food making it better and stuff.