If banning junk fast-food were effective, yes, but an outright ban would be less effective in reducing obesity than other measures I've outlined elsewhere: 1. Tax fast food meals that do not meet minimum health standards by 300%. 2. Nationalize all supermarket chains and use revenue from fast food tax to expand co-ops and greenmarkets. 3. Ban all forms of fast food marketing that target specific urban or ethnic demographics. 4. Mandate healthy cafeteria servings for every school. No exemptions. Students can't bring their junk food from home. 5. Ban HFCS. 6. Ban the use of trans-fat in restaurant food.