IBS can also cause difficulty in digesting fats. Healthy fats and unhealthy fats alike. I've been trying to follow a reasonably healthy diet (rich in healthy fats, whole foods, whole grains, fresh fruits and veggies, raw foods, etc.) and having more and more problems, and it turns out that fats and insoluble fiber are major triggers for a lot of IBS sufferers. Go figure.

It feels SOOOO counterintuitive, but I'm feeling so much better on a low-fat, cooked fruits and veggies, white rice instead of brown, regular pasta instead of whole grain, diet. No alcohol, no coffee, low to no dairy, lots of fermented foods. Very different from the ideal diets of the rest of my family, and very illuminating. I'm coming to realize that each of us has a different "ideal" diet. Mine's a little more extreme than others because of that specific physiological quirk that signifies IBS, but ds does best on a lot of protein and no nightshades, dd does best on a varied diet with low dairy, and dh does best on a low-wheat diet with healthy fats and lots of veggies, raw and cooked.
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