To echo Adam (above), to say that Type 2 Diabetes is caused by obesity is inaccurate. Obesity can be a contributing factor, but the strongest component is genetics. There are many people diagnosed with Type 2 Diabetes who have never been obese.
There's absolutely no way I would send my children to that school for the summer. I would be surprised if more than a handful of students show up for the extra 34 days.
What is this about cranberries? I'd like to see how that would work...