I can try to answer this and perhaps answer some of the questions that were raised by other members.
It's very difficult to give explicit examples to resolve this problem. As Dr. Cargo said, there have been reviews of studies of interventions in other populations in the United States that tried to reduce the prevalence of obesity in children. The majority of those have failed, if you look at modifying a child's body weight. They may have increased the knowledge, awareness, or self-efficacy that a child could make a change to improve diet or activity, but in general the results say that most interventions have not been effective, in terms of reducing the prevalence of obesity. It's an incredibly complex problem. We live in a society that makes it very easy to eat energy-dense foods and not move very much.
However, in Canada we have published examples of community-based diabetes prevention projects in first nations communities. Discussed here today was the Kahnawake school diabetes prevention project. In northern Ontario, there is also the Sandy Lake first nation school diabetes prevention program, and as Dr.Cargo mentioned, in the United States there was a National Institutes of Health study called “Pathways”.
What is clear from the publications on these interventions in first nations communities is that interventions cannot be focused solely on the individual. That's one of the major messages.