The moron is full of crap, as usual. I have diabetes and there is not a single thing I can not eat. Depending on many factors, the intake of carbohydrates must be controlled but there are no foods, not a single one that I can not eat.
Of course, there are diabetics that don't control their diets. A common result of that are minor difficulties like kidney failure, amputated extremities and blindness. However, there are no foods a diabetic can not eat.
The point here is the fact that Chartwit is simply ignorant of all things.