In studies Low-fodmap is typically only recommended for ~6 weeks. I now try to eat any kind food though, I eat everything in smaller quantities and this also helps.
I personally found that a combination of diet, stress, sleep control are the most effective for managing IBS symptoms. Any one of those can flare up the symptoms at any time and managing all of them is key
But I have several family members on it right now, and they all report feeling WAY better. And this is after years of dealing with IBS type problems too.
Honestly the scientist(s) who developed the low FODMAP diet needs to be awarded a Nobel prize.
Then the next day, almost always in the morning is when the problems will start. Perhaps the bacteria had time to ferment the food overnight.
So when I have symptoms, I always look at what I ate the previous day.
So it definitely gives positive results, but it’s also very difficult to follow.
Personally I use this app when eating anything I'm not sure about, it has a database of foods and their fodmap content: https://www.monashfodmap.com/ibs-central/i-have-ibs/get-the-...
Everyone is different but personally, I'm able to tolerate everything except Fructans (one of several types of FODMAPS). So no garlic, onion or wheat for me.
https://www.monashfodmap.com/ibs-central/i-have-ibs/starting...