Wow, I am so sorry noone has responded to your thread in almost a month, but I rarely come on this board, so I thought I would stop by. When I was 9 years old I actually weighed more than your son.  I was 190 pounds and by the age of 12 I was 275, and by 13 I was 310 and just went up and up until I eventually hit 458 which I am at right now, and is my highest and I am currently 19.  I played basball from the age of 4-12, I played football all through middle school and I wrestled through middle school and high school, what I have to say to you is physical activity is good, but isn't the main necessity.  You, as a parent, need to limit and have a set schedule when your child eats, and what he eats.  If he keeps crying, tuff, if he wants a certain treat, keep it in moderation.  Don't make it an everyday thing.  I am totally not bashing your parenting skills in anyway, and yes I am still a child myself, but I am old enough to see what my parents did to make me 458 pounds at the age of 19. Personally I didn't realizie how big and uncomfortable that I was with myself until I was 13, and I had already weighed 310 pounds at that point.  Going through your life as an extremely obese teenager is not fun, and if you get to that certain point it is so hard to reverse it! All I am saying to you is, that you can stop this!  He doesn't even have to start of by completely going to healthy foods.  Keep a journal of what he eats on a daily basis, start reducing his portion sizes.  After reducing his portion sizes, start giving those foods to him in moderation (maybe just as a treat).  When dinner time comes around make fo low in calories and low in fat.  If he doesn't want to eat it, then that is on him.  I would personally send him to bed hungry, or he would have to eat what I made him.  75% of the time they will eat what you make.  He is only 9, he doesnt have a car or the money to go buy mcdonalds, you buy it for him and that has to stop.  If he is able to go into the kitchen and make his own foods, have you considering putting a lock around the fridge?  Or around the cabinets?   There is alot of things that you can do to reverse this.  I just don't want anyone to ever end up in my shoes, and I tell my little 8 year old sister that everyday.  I was the first born of my parents and the only super obese one out of my siblings, and I blame it on my parents being young when they had me, and had no money other than to buy me fast food everyday.  I am sorry that this is so long, and I will stop right now.  But just try to make a change, and I hope that it will work out for the better.