Welcome JS and Hope!
Foods don't "cause" IBS, though you can be very sensitive to some foods and once you have an attack, that food can become a "trigger." If foods were the sole cause of IBS, everyone would just stay away from the exact same foods and be fine, but we know that some people react to one food one day and not the next and that it can vary between individuals.But that said, it is a known fact that foods high in fat can cause D symptoms in IBS folks and non-IBS folks alike! I had tried several diets and none worked for me because there wasn't any consistent pattern to my food reactions, except for a few which I avoided. Now I can eat those foods too (nuts and popcorn were my no-no's! and now I eat nuts every day.)If you really want to investigate the foods/IBS diet route, you can look at ...com as that diet has helped folks with food issues. But not all food issues are IBS, so it can be confusing - food intolerances and allergies are not IBS, though you could have them alongside IBS! Lactose, gluten intolerances, etc. are not IBS in themselves but can certainly cause IBS symptoms. If you eliminate them from your diet and your IBS symptoms have stopped, you may not have had IBS!Feel free to ask questions - there are lots of nice folks here to help and support! Over the years I have read a lot on IBS, and it can be overwhelming when you first start reading about it!I have had IBS since 1983, and you can take a peek at the links below for what worked for me - doesn't work for everyone, but it was a last resort for me as I was housebound and nothing else worked.Take care, and again, welcome!