My understanding of the current science is that many cycles of excess carbs (especially processed carbs) while you are not in a calorie deficit, alongside a sedentary lifestyle, are bad for metabolic syndrome and insulin resistance.

White flour pancakes ALWAYS give me a blood sugar crash, and often cause a mild to moderate hypoglycemic episode; but I can eat whole grain pancakes without too much trouble.

If you're not carrying a large amount of excess weight, it might be worth trying the potato diet for a short time period, with a LOT of caveats. The problem is, as always, what happens when you go off the diet.

One of the main reasons I've switched from a Mediterranean type diet (lost about 20 lbs there) to low carb was sort of about this as well. When I eat bread and other flour based things my energy through the day is much more variable. Low carb seems to give me a much steadier supply of energy through the day after I got over that initial two week hump where your body adjusts to a new way of eating.