DebRD_ATL said:

The escalation order that reflects the mechanism: water and salt first, then soluble fiber, then magnesium or an osmotic agent, then a stimulant only…

Worth saying plainly that not all of this is benign. Severe constipation on delayed gastric emptying has produced obstruction and ileus cases, rarely but genuinely. Pain with vomiting and no bowel movement is not a fiber conversation.

andrew_nyc said:

I added fiber, made it noticeably worse, and only later worked out that I had added the bulk without adding the water.

Gastroparesis symptoms with constipation: the delayed gastric emptying from GLP-1 agonists can cause early satiety, bloating, and feeling "full" for hours after a small meal.

Tips: eat your protein FIRST (most important macro), then vegetables, then carbs last. Chew thoroughly — 20-30 chews per bite isn't excessive. Avoid carbonated beverages with meals. If symptoms are severe, your doctor may recommend a gastric emptying study.

Dr.SurgeonPGH said:

Worth saying plainly that not all of this is benign.

Sulfur burps on constipation — the most underrated side effect nobody warned me about. 🤢 The smell is absolutely vile and comes on without warning.

What finally helped: eliminating eggs and cruciferous vegetables. Also, eating smaller portions and chewing thoroughly reduces the gas production.

If sulfur burps persist beyond 2-3 weeks, talk to your provider — it could indicate gastroparesis that needs medical attention.

Following on from CanadaChris — and this may be the naive question:

Whether fiber actually helps GLP-1 constipation or whether the evidence is borrowed from a different population?

Reporting back.

Update — the osmotic agent was the thing. I had been reaching for a stimulant, which was making the next day worse.