At my worst, I was basically vegetarian. little protein, little fat. And then the nutritionist had me supplement with bran fiber, and a gallon of water a day. I was in terrible pain (and that definitely wasn’t 50g+ grams, since I don’t eat grain, wheat, bread, etc.). The key for me was to reduce fiber in the form of bread, grains, etc. and to increase my protein and fat especially. Later I learned that this is all supported by research. But again, this is a tough field – most doctors are still just saying “IBS” And sending people on their way without answers.