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If you really want to combat obesity, you have to ENFORCE policies that can help offset it. EVERYONE know how to lose weight. Eat right (as in don't consume too many calories, how many depends on the individual's height and build) and some moderate exercise. That's it! It's not rocket science.

If you want people to actually CHANGE their habits, tough luck. Best to start at school and actually encourage healthy behavior instead of installing soda machines and selling pizza at the cafeteria.