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All carbohydrates become sugar, sugar elevates insulin, constantly elevated insulin leads to diabetes.

I'm not sure all the causes of Type 2 diabetes but I would wager that the current epidemic of Type 2 Diabetes is caused by too much sugar.

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It is not currently established what the exact relationship is between sugar in your diet, obesity, diabetes. They are all basically risk factors for the next one, but they definitely don't cause (in the strict scientific meaning of the term) one another---there is nowhere near enough scientific evidence that would support that. There's enough uncertainty about the whole process that saying "avoid known risk factors" is about the best advice you can get.

> All carbohydrates become sugar, sugar elevates insulin, constantly elevated insulin leads to diabetes.

But my understanding is that some carbohydrates get turned into sugar more slowly, and this "flattens the curve" of blood sugar relative to consuming sugar.

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