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What is a j-pouch — and what can you eat with one?

A j-pouch — also called an ileal pouch-anal anastomosis (IPAA) — is an internal pouch surgeons build from the end of your small intestine to store output after the colon and rectum are removed, often for ulcerative colitis or FAP. It lets you pass output the normal way instead of into an ostomy bag. Because you no longer have a colon, output is looser and more frequent, so most people do best on gentle, lower-residue foods at first — white rice, eggs, ripe banana, well-cooked skinless potato, lean meat and fish — then broaden their diet as the pouch adapts over the following months.

After the large bowel is removed, the j-pouch takes over as a reservoir for output. It works well, but it can't do everything the colon did — chiefly reclaiming water and saltand fermenting fibre. That's why life with a j-pouch centres on managing output and staying hydrated, while still eating well and enjoying food.

Most people pass output several times a day, and frequency usually settles over the first months as the pouch adapts. Eating tends to follow the same arc: gentle and lower-residue early on, then steadily more varied.

Where to start with food

There's no single “j-pouch diet” — tolerance is personal and changes over time. A tool like the GASP Score helps you compare foods and meals so you get fewer surprises while you work out your own pattern. See who it's for for how different situations use it.

Try it on your own food

These ideas are a starting point — see how your actual meals and foods score.

Score a meal →

Type what you're eating and get a GASP estimate.

Browse scored foods →

Every food, ranked gentlest to harshest.

Check a recipe →

Paste any recipe and score its ingredients.

Scan a product →

Enter a barcode and score the ingredient list.

Sources we drew on

Our synthesis and interpretation — we're not affiliated with or endorsed by these organisations. Use them as starting points for your own reading.

Written and checked from lived experience with a J-pouch. Last updated June 2026. The GASP Score is a modelled estimate, not medical advice — always work alongside your own clinical team.

Scores are modelled estimates, not medical advice. Everyone's gut is different, and tolerance changes over time. Reintroduce foods one at a time, and follow your own medical team's advice.