Check out HBO's "Weight of the Nation." It's four parts but worth it.
If you don't have the time (or HBO), the really short gyst is: eat fewer calories. Use exercise for maintenance. Without the calorie reduction, losing weight through exercise alone is a beast. Americans underestimate their calorie intake and overestimate how many calories they burn and even how many calories are burned during exercise in general. IOW, very similar to Dream's stances.
There's also a lot of info on legislation, healthcare costs, food lobbyists, etc. For instance, 50% of all US farmland is either corn or soy because subsidies make them the money makers. Less than 3% is fruits/vegetables, they aren't subsidized and thus artificially lower cost/higher profit like corn (sugar) and soy beans.
Anyway, check it out if you can. I found it helpful to refocus me on my dietary aspirations.