I didn't realize this was in diabetes support. If you're diabetic, the rules change a bit. If you're a type II diabetic, are on little or no medication and your blood sugar is under fair control, a few french fries aren't likely to be a big deal.
However, if you're on insulin, and/or your blood sugar isn't under good control, you may have to be stricter with your diet. In which case, this isn't a question for 3FC, it's a question for your doctor, dietitian, or diabetes educator.