I've had bariatric surgery, which led to severe nausea (called "dumping" if you decide to do a search for it); started tirzepatide last summer to get rid of the weight I had gained (to improve my knee arthritis), which led to a slew of GI side effects; and moved to semaglutide this year, largely to deal with the side effects.

One of the key reasons the weight went back on was that I eventually fell back on comfort food to assuage the dumping syndrome, so yeah, part of this is behavioral. However, I also devoted a lot of attention to figuring out my list of trigger foods, and that's what worked in the end.

This was a very useful experience when I started the GLP-1 RAs. I titrated up more slowly than they recommend, paused and stuck at a lower dosage than the maximum, and titrated down slowly. During this experience, I did make use of the controlled nausea as a tool to help manage my eating, but I also did a lot of tracking to figure out what made a difference, and also got a prescription for anti-nausea medication that I used sparingly. I found that the symptoms were worse with some foods than others, if I didn't stop eating immediately when I started to feel the first edge of nausea, and at meals later in the day (I used the medication to help me be able to go out to dinner for social occasions, since otherwise dinners were difficult for me). This may or may not be the same for you, but it's an example of sleuthing the issue out.

It's really important to prioritize protein and fiber when we eat so much less. Unfortunately, this has meant that I haven't been able to rely on plant proteins, where the protein requires eating more volume. In my case, vegetables are more triggering than fruit, especially cruciferous vegetables, so I'm skewing toward fruit.

My GI symptoms are only partially dose-related, meaning that dropping down to a lower dose helped a little but not a lot. That's why I switched to another drug in the family, which helped (as did the fact that I could get it as a multi-pen, which let me fine-tune dosages). Switching definitely helped, although it took a couple of months for my system to calm down.

This was not the only side effect I had, and I've systematically been going after each one. I don't think this is normal -- someone has to be a statistical outlier, and I guess I was elected -- and it really is normal for the nausea to be dose-dependent and to go away over time. But it does appear that the weight loss is not just a reaction to the nausea, and does not depend on that symptom. So if you can get the nausea under control, you may well see the weight loss still happen.