I believe it.
And I'm pretty sure at least 25% (and growing) of those people are found in India.
Until people (especially the medical community) realize that the best way to treat diabetes is not just by 'eating less and losing weight,' but specifically eating less/no grains/sugar/fruit/starch (and therefore weight loss will follow as a result), this epidemic will just grow and grow.
In fact, South Asians (people of Indian/Pakistani/Bangladeshi/etc. descent) are likely to develop diabetes at 'normal' BMIs--there is no correlation between BMI and diabetes likelihood for them like there is for non-Hispanic white Americans. As long as people continue to believe that weight is a sufficient proxy measure for susceptibility to chronic disease, their health will suffer. (And if anyone doubts this re: indian people I can post links to the studies I've been reading).
So in addition to the awful CW, I blame this epidemic in part on the fat = unhealthy and root of all health problems (rather than, a lot of times, concurrent with health problems), and thin = healthy ("how can I have diabetes? I'm a skinny vegetarian?!") paradigm that most people buy into.