Not the person you were responding to, but yes. Stomach empties much slower, which seems to effectively make it smaller. A normal size (pre-drug) meal will make me uncomfortably full and probably cause reflux.

That said, I've noticed in the past, and also now on this drug, that my gastrointestinal issues abate noticeably when I consume less food. Thought I had IBS and then I went on a significant diet and lost 40 pounds in 2020. The IBS resolved, and not after I lost 40 pounds -- it basically stopped altogether a matter of weeks after I changed my diet. That was educational. YMMV.

I'm still working out my approach to eating while taking tirzepatide. Old habits die hard, and I'm having to cut my meal size way back. This sucks because my problem with eating too much was about eating too often, or not when hungry, not about binging. So I have to eat pretty small meals now. It will take some adjustment to find the right way to get sufficient nutrition while volume limited, but I think it can be done.

If your IBS is the "stuff moves too fast" variety (so, IBS-D) GLP-1s seem to help a lot since they slow things down. If your problems already stem from things moving too slow... maybe not so much :P