A better push would be to prevent the food industry from poisoning us with ultra-processed food and corn syrup. Having food regulation would go a long way in preventing obesity and many other negative health outcomes.
No one solution is going to reverse the obesity epidemic. Better food labeling, ingredient regulations, health education for all age groups, cost of living reduction, food desert reductions, and likely many more things will need to be addressed if we hope to see noticeable changes.