Hi. This question requires a personal answer, based on elements of your own community. However, I will answer your question based on my community and hope that this answer will serve as a model for you to create your own answer.
One of the most effective strategies that my community created to reduce childhood obesity cases was to hold a weekly ecological fair that allows farmers to sell their products. This fair encourages families to buy fresh fruits and vegetables, and make a healthier and more natural diet, with fewer industrialized products that can encourage obesity. Another strategy has been the partnership between farmers and schools in the city. This allows snacks offered at school to be more nutritious, less caloric and healthier.