It depends on whether the person is type 1 or type 2. If type 2 there are discussions going on as to whether artificial sweeteners (AS) can add to insulin resistance. Although AS does not increase blood sugar, it is a sweetener and once in the mouth, can cause insulin to be released as if it were real sugar. Because type 2's are already insulin resistant, it is more likely to produce more insulin than with a non diabetic person, so adding to the insulin resistance. This is not officially established as they are doing more studies on it, but it is possible. They have done experiments where they have given people water with sugar in, told them to just swish it in their mouths and not swallow, and the mere fact of sweetness in the mouth caused a raise of blood sugar.