[TorqueDog]

How you get your resistant starch is the problem. Resistant starches make up a small percentage of total carbohydrates in the foods that contain them, and the foods that contain them tend to be high in carbohydrates overall.

A resistant starch isolate like Bob's Red Mill Potato Starch is probably fine from everything I've found on the subject. But the second you cook a resistant starch, it chemically changes to become a non-resistant starch which is pretty much exactly what you're seeking to avoid with a ketogenic diet.

edit: Keto Connect did a video on it. Small study, small sample sizes, so your mileage may vary.