Type 1 or Type 2?
Type 2.
And Dr. Fung primarily is addressing Type 2. Though he does talk about type 1 sometimes. I remember him saying Type 1’s develop symptoms of Type 2 due to too much insulin. So I think fasting might help type 1’s that have type 2 symptoms, but don’t take my word for it.
Type 2. There is other ongoing research into Type 1. Not a cure, but a stabilization of blood glucose with low carb. Type 1 still need insulin.