I tried Fodmap briefly. I also was on Heather's diet for almost two years resulting in malnutrition and anemia. To be fair to the diet, when it didn't work, I just got more and more restrictive with what I ate. I'm not convinced dietary interventions are that successful for those of us with constipation predominant IBS. But if there's a food/foods in particular you think might be related to the high water retention, I'm open to suggestions.