The BSD rules don’t entirely exclude refined carbs.
“I’m not saying all carbs are bad. Along with fats and proteins, carbs play an important role in our diet. The problem occurs when you eat too much of the wrong sort. . . . That doesn’t mean that rice and potatoes are evil, but don’t pile your plate with them. Think of them more as a side dish than a staple, and try to find alternatives.” )[lines 898-919 in the Kindle version.]
The two primary descriptios of the carb categories are “easily digestible carbs” and “Complex, unrefined carbs.” My understanding of resistant starch is that the process of cooling (preferably multiple times) converts the starch from easigly digestible into significantly less easily digestible – which would move it toward (if not in) the second category of carbs.
All that is to say that, as I read the book, including potatoes or pasta as a side dish (evenwithout making it resistant) is consistent with the BSD.
I certainly wouldn’t make a staple out of it, or have it at every meal, but on occasion I have been able to consume as much as 30 grams of carbohydrates from a potato salad, made by repeatedly heating and cooling with approximately the impact that 20 net grams of carbohydrates would otherwise have had – a pretty significant change in ease of digestion.
From a blood glucose management perspective, test your BG before you eat, at 1 hour, at 2 hours and, if 2 is higher than 1, at 3 hours. My personal threshhold is to keep my BG within the normal range at all times. Aside from experimenting, if something pushes my BG (even for a transient spike) above 7.77, I don’t eat it. The 30 grams carbohydrates in my resistant starch potato salad (a generous side dish serving) topped my BG out at 6.89)