My son is now overweight. but he doesnt overeat whats wrong with him?

He might not over eat but it sounds like hes eating unhealthy food. Poptarts arnt healthy, soda is definitly not healthy and chips arnt healthy and then you give him $4 to spend on snacks. They are all fattening. And you said you give him $4 to spend on snacks, at my school chips, cookies, and gummy bears and stuff cost 50 cents. If its the same prices as his school he could by 4 bags of chips and 4 bags of cookies. And also some people are just overweight because of genetics. And make sure hes exercising too.