We always did pizza after soccer, sometimes mcdonalds. The thing is, i have far more memories being denied garbage food than I do actually getting it. Id get in so much trouble if i busted open a bag of cookies at home without asking or cut myself a disproportionately large slice of birthday cake.  Being a greedy pig was on the same level as cussing when I was a child.  Never acceptable. Food can be a reward, and its often unhealthy, thats how the world works. Just learn self control.