@Ripley I am trying to find these David A. Relman studies at Stanford that show SBOs are more numerous in the gut than lactic acid bacteria, but cannot find them. Would you have any references? There are 178 studies by David A. Relman on PubMed, but I cannot find any that refer to SBOs. And a Google search on David Relman and SBOs also finds nothing about SBOs in the gut. Chris Kresser does not provide any reference to his statement that "SBOs are more numerous in the gut than lactic acid microflora". I have ordered a packet of Bob's Red Mill Unmodified Potato Starch, by the way, and look forward to testing this. Thanks very much for posting all this very useful info on resistant starch.