In a recent JAMA commentary, the authors suggest that state intervention might be considered in severe instances of childhood obesity.
In a recent JAMA commentary on life-threatening childhood obesity, Murtagh and Ludwig1 write that that as an alternative to treatment at newly established pediatric surgical weight loss programs, "involvement of state protective services might be considered, including placement into foster care in carefully selected situations."
Reference
1. Murtagh L, Lugwig DS. State intervention in life-threatening childhood obesity. JAMA. 2011;306:206-207. Full text (requires subscription)