What could be done to reduce obesity rates?

Walking. Get out of the car walk or bike no sugar drinks salad, vegetable, fruit, fish common sense.
Eat Healthy. Check out http://www.Sparkpeople.Com or http://www.Myfitnesspal.Com. They offers nutrition, health, and fitness tools, support, and resources that are 100% free. Make half your meal vegetables and fruits. Go for variety. And keep in mind that potatoes and french fries don't count. Choose whole grains & limit refined grains. Pick the healthiest sources of protein. Drink lots of water. Stay active.