I believe if I understand it correctly that IF is what makes you have your bms. The SF helps to bulk up your stool and provide a "base" so that the IF is not so harsh on your system if that makes any sense. Yes, you should be eating SF/IF at each meal and the ratio depends on the person (and I have found for me that it depends on the day). This thread had just confused me too though b/c of the sweet potato thing...not sure myself. Maybe someone can clarify.
-------------------- Originally IBS-D for a million years!
Then IBS-A, Now a transformed slightly C