You already know the answer to this if you’ve been reading my blog. Dietary fat contributes to the development of insulin resistance. I’ve said this for years; I’ve cited studies for years; I’ve described mechanisms for years. It’s not the carbohydrate, it’s the fat.
Here’s Dr. Greger saying the same thing last week:
Here are a couple of my recent posts on this topic:
Mechanism By Which Dietary Fat Can Raise Blood Glucose And Insulin
Fat Affects Your Blood Sugars