I’m going to be honest - my stomach is used to higher fibre from childhood but after deciding it didn’t like coffee over the last few years, it has never been able to handle regular coffee + high fibre. Would just come straight out sometimes minutes after having coffee. Got to the point that I couldn’t handle lots more things, oatmeal in particular. Tried all the fermented foods and no dice.

The only way I’ve been able to recondition my gut, sadly, was go completely off coffee AND tea for the last two months, and I’ve only been able to do that (without being a completely useless and sad fuck) by getting onto ADHD meds. I’m now able to eat oatmeal and even fibrous fruit smoothies again after 3 years, without a firehose out the rear end. And I can have the occasional coffee without any gut issues