It's pretty scary how much of US taxes are supporting fast-food and other corn/soy-based food. About 0.8% of the national budget goes to agriculture (
http://www.whitehouse.gov/issues/taxes/tax-receipt) with billions of those dollars going to subsidize the production "staple" crops that make us obese (
http://www.gpoaccess.gov/usbudget/fy12/pdf/BUDGET-2012-BUD-5... - I've heard all of the "commodity" line items point to those subsidies, but it's hard to decode)