I believe the food is way more important as exercise. What we buy is junk food and not healthy at all. Palmfat, transfat, E numbers they are all making you fat and even cause cancer. My children are aware of it. No fast food, soda, potato chips, cookies, candies etc and if home made. If you need to prepare all your food yourself you eat different as well.
I wish you the same. Hope your parents will do better somehow.