Nearly 20 percent of Connecticut children live in homes that are food insecure, according to a study by the Connecticut Food Bank and Feeding America. Those children are at higher risk of obesity than their peers. That’s because their families rely on cheap but unhealthy food to fill their grocery carts, because they live in places that don’t offer good opportunities for physical activity, and it is also because their parents are working so many hours, that fast food becomes a major player in the family diet.