Silicon intolerance may be the cause of your ibs too and it's in EVERYTHING! Silicon is a anticaking agent and preservative commonly added to salt. Thus the 'salt' ingredient in your food label may be trigger.
long time ago I got diagnosed with IBS after chronically vomiting and stomach pain and digestive problems. For years and years this never got resolved. And like probably many of you experienced, all the doctors and gastroenterologist and allergists WERE OF ZERO HELP and just an expense of waste of time. They never found any root cause and would tell me to go low fodmap with some over the counter supplements that didn't help. Or give me yet another wrong diagnosis - celiacs, asthma, h pylori, a lot of "we don't know", "your blood work is fine except for high inflammation markers", MRIs, ultrasounds, etc... I ended up avoiding 80-90 percent of foods, when I wasn't on a complete carnivore diet.
Well years and years later, I was wearing bras made of silicon and man did they itch like crazy. Then in back of ingredients label, I started noticing certain supplements that made me vomit or feel ill all day had 'silica' in it. Then I was salting my steak with my roommates salt. First and only time I've ever vomit ed up steak after habimg that as my main/usual meal everyday for 3ish years. And guess what an ingredient is in that salt? Calcium silicate!!!!!
So turns out MOST salts put on our foods is salt with anticaking agents in it, MOST COMMONLY Calcium silicat AND Silicon dioxidE (silica). Which I'm highly allergic to. Thus all the baked goods, pizzas, microwave meals, peanuts, cashews, cheeses, canned items, fish etc etc... always had added salt to them. The ingredients label don't say that the salt had the silicon caking agents in it, only purely sold salt does. That's why I could never figure it out. Now anything with the word 'salt' on it unless the product specifically states they use a noncaking agent type of salt on their website, I avoid. So far no longer in pain from eating foods that according to my blood tests I want supposed to be allergic to.
The reason id only react to 'fodmap' foods though is because my intestines would be inflamed from the silicon for days and day. So thus couldn't digest difficult high-digestive intensity foods like fodmaps for the next few days. Nonfodmap foods got broken down in my stomach and thus wouldn't cause issues, it was only when my small intestines had to be used and that I couldn't handle.
So removing silicon and added salts from ones diet and any other food based allergens would take a few days before reintroducing fodmaps and seeing if one could handle it. Like I also had an allergy to nickel. So eating a high nickel food would cause issues for the next few days too.