I have IBS symptoms basically fully in times of stress, days on end, otherwise things are fairly normal. I wonder if either my understanding of IBS is false, or it's not biome related for me.
Its a fairly new thing - from about 15 years back. Nowadays one of the treatments that a gastroenterologist could recommend if they have exhausted everything else is low dose anti-depressant.
Key is to identify what is causing stress and treat that