This is asked from both sides: the non-diabetic who doesn't understand
diabetes, and the diabetic who gets tired of hearing "I won't put any sugar
on the table" etc etc ad nauseum.

Diabetics should eat a high-quality, healthy diet very similar to that
recommended for everyone. This will include some sugar, and research
indicates that obtaining a moderate amount of carbohydrates in the form of
sugar makes little or no difference in controlling blood glucose levels. There
isn't room here to describe all the aspects of diabetes treatment that make
this so.

No one has suggested a really good, uniformly satisfying answer to the public
know-alls who insist they know more than you do. Feel free to add to this
list:

    That was true before insulin treatment became available in 1922.

    Fat is more dangerous than sugar because diabetics have a three-fold
    higher risk of heart disease.

    The whole point of injecting insulin is to balance carbohydrate intake.

    All carbohydrates are converted to sugar in the digestive tract anyway.