I watched the "Supersize Me" documentary... the guy ate three meals a day for a month at McDonalds and he said he got a pound of sugar a day !! There are 24 teaspoons of sugar in the biggest soda at McDonalds.. Sugar is in every single thing they sell except for about five items..
Two things make us fat, one is the sugar, the other is the lack of exercise. Even mild exercise won't take off much weight, you have to get your heart rate way up for awhile before the body switches to fat burning mode, walking won't do it.
All those obese people are living in a weird zone where they are ignorant about nutrition and never get their heart rate very high. Considering the influence that all those McDonald's profits have on our culture the fat problem is here to stay, likely...