Diet is HIGHLY important! This is another area where Endocrinologists are faily patients big time since most believe thag diet does nothing. Most if not all patients have food allergies and sensitivities even if they don't realize it. Many people have non-GI symptoms to foods they are sensitive to like migraines, mood issues, etc...
I found that curting out grains, dairy, and soy to be most beneficial. Also trying to eat as much organic, locally grown produce/meats as possible is best.