The starch in Jerusalem Artichokes is the same thing you will find in those probiotic capsules at the pharmacy costing $30 for a months worth. The amount of inulin, that human indigestible starch, in a single tuber of of a couple of ounces is more than that months worth of gut bacteria food in those capsules.
Is that what prebiotic are? They just make you fart. I’ve never really had a problem with that. 😀