thats a tough one. I dont like the fact that the kid was placed in foster care but a 200lb 8 year old??? Unless he is a really tall kid (5'8+) then its more than likely the parents fault.
I was out shopping the other day and the family in front of me in line had two young daughters who were both very overweight for little kids and it was really sad to me. You dont want to start your kids out with body/food issues as little kids (especially girls) but what can you do?
The rising rate of child obesity (not sure if thats the best word or not) is alarming and when the USDA says that microwave cheese pizza now fills the "vegetable" requirement for school lunches I dont see it getting better any time soon.