The natural health people have been saying this for decades now and it goes to prove that although they are poo-pooed by the medical community, as they almost always are, they are right again, as they almost always are.
At the very least, they have a better track record than the medical community.
Actually, this ‘finding’ is known to be wrong!
The largest contribution to type 2 diabetes is artificial fats like margarine, and polyunsaturated fats.
These fats, when used by our cells to form the cell membrane, result in a cell that cannot admit sugar to be metabolized, thus leaving the sugar in the blood stream to be converted to fat and stored in the upper body.
The most noticeable result of all this is weight gain, but it also over-works the pancreas to produce excess insulin, and may be a factor in cancer of the pancreas and liver.
More information on this can be found at http://www.cancertutor.com/Diabetes/Diabetes_Type_II.htm
Not that all the sugar we consume is a good thing, since it will feed any malignant cells that may be in our bodies, and contributes to low blood ph, which also contributes to cancer.
Single best thing I have done for my health is quit my Pepsi addiction about 4 years ago.