It is true that type-2 diabetes is more common in the fattest states.

ECONOMIST: Diabetes

While it is true that some of these diabetes patients became ill through no fault of their own, most became diabetic because of being overweight, having a poor diet, not exercising enough, etc.

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The same is true for obesity and, in most cases, diabetes.

NEWYORKER: The Operator

Diabetes itself can cause heart attacks, so if charges that Avandia causes heart attacks are true, use could plummet.

FORBES: Magazine Article