Fiber, fluids, and consistency are the foundation of comfortable digestion on a GLP-1. Because these medications slow how fast your stomach empties and you're eating less overall, digestion can feel different — but a few steady habits handle most of it.
How much fiber, and what counts
Aim for about 25–35 g of fiber per day, mostly from food. Most adults get only ~14 g.
Two kinds, both useful: soluble fiber forms a gel that steadies blood sugar and feeds your gut (oats, beans, lentils, chia, flax, pears, berries); insoluble fiber adds bulk for regularity (vegetables, whole grains, nuts, seeds).
Variety matters more than any single "superfood" — aim for ~30 different plant foods across a week to support a healthy gut microbiome.
Increase fiber slowly (the most common mistake)
Add only ~2–4 g per week, and keep it consistent day to day before adding more. A sudden jump — or swinging high and low — is a top cause of gas and bloating.
Start small: 1 tsp of chia, not a tablespoon; 2 Tbsp of beans, not half a cup.
If your digestion is sensitive (e.g. IBS), go even slower — about 1–2 g every two weeks, soluble fiber first.
Always pair more fiber with more fluid; fiber without enough water can worsen constipation.
Fiber supplements (like psyllium)
Food first, but psyllium husk is well supported for regularity. Start at half a dose and build up.
"Double the water" rule: if the label says 8 oz, have ~8 oz before, mix with 8 oz, and finish with another 8 oz. Without enough water psyllium can't work and may irritate.
Bloating and gas
Some gas is normal — a sign your gut microbiome is active. Address bloating that's persistent or painful.
Common triggers: skipping meals or long gaps (eat every 3–4 hours; a small amount of food can actually ease bloating), swinging fiber up and down, eating too fast (chew; aim for ~20 minutes per meal), and carbonation, straws, or gum (swallowed air). Stress also slows digestion.
Gut health, simply
Your gut is an adaptive system supported by fiber, hydration, consistent meals, and time — not by cleanses, elimination diets, or microbiome test kits.
Probiotic supplements aren't required. Fermented foods (yogurt, kefir, kimchi) can help, but work best alongside enough fiber.
A note on magnesium: magnesium citrate can ease constipation, but keep supplemental magnesium under ~350 mg/day, watch for it in electrolyte powders, and check with your provider first if you have kidney disease. It's a tool, not a replacement for fiber, fluids, and movement.
When to reach out: if constipation lasts more than 3–4 days despite fiber, fluids, and movement, or you have severe or persistent abdominal pain or blood in your stool, contact your care team.