[Health Concern] Are potatoes really bad for people with diabetes?

Potatoes and sweet potatoes are said to be high in carbohydrates and not good for people with diabetes, but I wonder if that's actually true.

I understand the doctors' theoretical explanations on the broadcast, but I'm curious about how much blood sugar levels actually rise when diabetics eat these foods themselves. I would like to hear personal experiences from those who have tried it, or get recommendations for snacks that are good for diabetics.