At my heaviest I weighed about 200lbs and dropped to 150 in roughly 3-4 months. I remember feeling awkward when people congratulated me and told me how "amazing" this weight loss was, because it really wasn't that difficult. All I did was stop eating junk food and started jogging every morning before school. That's it.  If fat people knew just how easy it is to lose weight I'm sure a lot of them would be much more willing to at least try it.