I specifically asked my doctor about why I knew people who felt better on South Beach and he explained that it is temporary and the body reacted ok but it wouldn't last. Although I think eating lighter and with less sugar does help IBS because our guts prefer less calories in a day, it seems to me. As to whether the low carb thing would have kept you feeling good, well I don't think so.
-------------------- IBS-A for 20 years with terrible bloating and gas. On the diet since April 2004. Remember this from Heather's information pages:
"You absolutely must eat insoluble fiber foods, and as much as safely possible, but within the IBS dietary guidelines. Treat insoluble fiber foods with suitable caution, and you'll be able to enjoy a wide variety of them, in very healthy quantities, without problem." Please eat IF foods!