Some of the information in this article referenced dates to 1994 or earlier, but the bottom line is that times are a changin' across the globe.
"In Asia diabetes is so rare (my note; no longer really true, except in poor rural areas without westernized influence) that many people have never heard of it, yet as the Times reports, we now know that many Asians have the genes to be highly susceptible to the disease. Of course, genes don't change much when people move to a new country, but diets certainly do."
Here is the deal... people moving away from their roots is as much responsible for the familial health issues as anything else... if you grew up in a farming community on a family farm that had owned the land for centuries, eating seasonal home grown foods, and all of a sudden move half way around the world... your environment and diet changes; even if you are trying to eat the same foods they ARE NOT THE SAME as they are no longer likely seasonal or of the same quality... this stresses the environmental, including the dietary adaptations your familial line has developed for centuries.
The next generation or four, will struggle, most likely with "genetic predispositions" for familial illnesses and disease until new adaptations begin to take, if they can, and manifest themselves within the familial line as changes to their genetics begin to manifest themselves... the gene switches that have been turned off, now need to be turned on, others need to be turned off, assuming they have not been adapted into a dormant state... this takes time (generations) and is the foundation of a genetic predisposition.
Genetic predisposition is not a farce... we can change our families fate for the better through our choice of environment including what we eat.
Bottom line is... rediscover the indigenous diets of those predisposed to diabetes (preferably the diets of your own race; makes familial genetic transition away from the predisposition far easier), and eat those foods to resolve pre-diabetic and diabetic conditions... simple as that.
You may have to make compensations and adjustments for your current environment in order to eat seasonal foods, however this will tend to slowly move genetic adaptations to your current environment. You will begin to feel healthier...
While it is rather interesting and exciting to explore foods from around the globe, for the most part they are most likely not the best choice for your primary daily diet, with some exceptions.
Study indigenous foods and herbs... learn their secrets. There are classes where I live on indigenous herbs and local wild harvested indigenous food sources... or I can go for a hike and harvest my own... now there is healing :-)
The above does not overtly take into account our individual toxic load, which must be ameliorated and constantly addressed.