Why Your Safe Food List Keeps Shrinking With IBS

October 18, 2026•10 min read

You know your list. The four or five things you can eat without thinking twice, the ones you order when you’re somewhere unfamiliar or somewhere that matters. You didn’t sit down one day and decide on that list. It assembled itself, one bad afternoon at a time. Something went wrong after the curry, so the curry went. Then onions. Then bread, then the coffee you actually liked. The strange part is how sensible each decision felt on its own, right up until you noticed you were eating the same lunch every day and turning down invitations because you couldn’t work out what would be safe.

If that’s you, here’s the thing worth knowing this week. It isn’t fussiness, and it isn’t a willpower problem. It’s a pattern that’s now been measured in ordinary people at home rather than only in hospital clinics, and it’s one of the more changeable parts of living with irritable bowel syndrome (IBS).

This week’s research: the shrinking list has a name

A team based in Sheffield, working with colleagues in the United States, surveyed 4,002 adults across the UK and the US and published the results this year in the journal Gastroenterology. The general-population sample is what makes it useful, because almost everything we knew about food and IBS came from people who’d already got as far as a specialist clinic, and that’s a small, unusual slice of everyone living with it.

Everybody in the survey filled in two questionnaires. The first was the Rome IV questionnaire, the standard checklist used to work out whether somebody’s symptoms fit a disorder of gut-brain interaction, which is the current name for conditions like IBS where the gut and the brain are talking to each other in an oversensitive way. The second was a nine-item screen for avoidant and restrictive eating, which asks about eating less, eating a narrower range of things, and avoiding food out of fear of what it’ll do to you.

Here’s what came out. People whose answers fitted a gut-brain disorder, IBS among them, were considerably more likely to screen positive for restrictive eating than people with no gut symptoms at all, and the more regions of the gut involved, the higher that climbed. Three patterns of avoidance showed up in the gut-brain group. Losing interest in eating was the commonest, then avoiding things because of their texture, smell or look. Avoiding food out of fear of what would happen afterwards was the least common of the three, which is worth knowing, because fear is the one you hear about most in a clinic room.

Three honest caveats. A positive screen isn’t a diagnosis, it’s a flag saying this deserves a proper look. The survey was a snapshot taken at one moment, so it can’t tell us which came first, the narrowing diet or the worse symptoms. And it ran in two countries, the UK and the United States, so it isn’t a UK-only picture.

Why this matters for you: the people who screened positive weren’t simply eating a shorter menu. Compared with people who had a gut-brain disorder without the restrictive pattern, they were more likely to be underweight, and they reported more symptoms elsewhere in the body, more psychological distress, worse quality of life, and more trips to healthcare. The shrinking list isn’t a neutral coping strategy. It has a cost, and the cost is being paid quietly.

Two studies published this month point the same way from the clinic end, one from France and one from Belgium. Restrictive eating turned up often in both, and in the Belgian one fear of pain after eating was the main thing driving it. Both are specialist-clinic samples, so how common it was there won’t apply to everyone. The pattern, though, keeps appearing wherever anybody looks for it.

Why your gut-brain system makes food feel risky

Here’s the mechanism, and there’s nothing mysterious about it. In IBS the gut and the brain are in constant conversation, and in a sensitised system that conversation runs hot. Ordinary digestive sensations that most people never register get flagged as significant. That’s visceral hypersensitivity, which means the signals coming up from your gut are amplified on the way, so a normal amount of stretching or movement arrives in your awareness as pain. It’s a real, physical change in how the volume is set, and it isn’t imagination.

Now add learning. You eat something, you feel wretched two hours later, and your nervous system does what it evolved to do. It tags the food. It doesn’t stop to check whether the food was actually responsible, because in IBS symptoms move around for a dozen reasons, including how stressful your afternoon was. So the tag sticks to whatever you happened to be eating. Do that thirty or forty times across a few years and you’ve got a shorter list, plus a low hum of anticipation before every meal.

That anticipation isn’t innocent. Bracing yourself before you eat changes how your gut moves and raises your attention to sensation, which makes those sensations easier to notice, which confirms the fear. That’s the maintaining loop, and it runs on prediction more than on food. We looked at a related version of it in the worry that grows on top of IBS, where a year-long study found the distress sitting on top of the symptoms was predicted by psychological factors rather than by how inflamed anybody’s gut was. And if you’ve ever blamed a food for bloating, the fibre post from September is worth a look.

The study’s authors make a point that deserves saying out loud. Exclusion diets, the low FODMAP diet among them, have been linked in other research to a raised risk of restrictive eating when they’re run without a dietitian alongside. Low FODMAP was designed to be temporary, with a structured phase where foods come back in, and plenty of people are handed the first half and never the second. If your list shrank after a diet you were told to try, you didn’t do it wrong. You were given half a protocol.

This is where the mind-side work earns its place, and it’s worth being precise about what that is. My own work is cognitive behavioural hypnotherapy, which puts three things on the same maintaining loop: cognitive behavioural therapy, meaning working with the thoughts and habits that keep the loop turning; mindfulness, meaning learning to notice a sensation without immediately reacting to it; and gut-directed hypnotherapy, which uses focused relaxation and imagery aimed specifically at the gut. Gut-directed hypnotherapy carries a strong recommendation in the British Society of Gastroenterology guideline for IBS, and NICE lists it as an option for IBS that hasn’t responded to first-line treatment after twelve months. The study’s authors point to early work on step-by-step approaches that widen the diet again rather than narrow it further, which runs on the same logic. None of this is talking yourself out of real symptoms. It’s turning down the amplification, so the prediction stops writing the outcome.

Your top tip this week

Write the prediction down before you eat, then write what actually happened. Take one meal a day, something already on your safe list, and before the first mouthful jot two lines: what you expect to happen, and how certain you are out of ten. Two or three hours later, add what actually happened. Do that for a week. The point isn’t to prove yourself wrong. It’s that fear predictions live in your head as a vague dread and almost never get checked against the record, and written down they become testable. Most people find their certainty was running well ahead of their evidence. Please don’t use this to push yourself back into foods you’ve cut out. Reintroduction is real work, and it belongs with a dietitian or a therapist alongside you.

The takeaway

If your world of food has narrowed, that isn’t a personal failing. It’s what a sensitised gut-brain system plus a few years of unlucky coincidences will reliably produce. It’s also one of the more workable parts of IBS, because it runs on learning, and learning can be revisited. The list can get longer again.

Wherever you are right now

If you haven’t had a firm diagnosis yet, start with your GP. Gut symptoms have several possible causes and some of them need ruling out, so get that done first. It also gives everything else you try a clear starting point.

If you were diagnosed a while ago and you’re still struggling, you’re exactly who the guidelines had in mind for psychological approaches. Try the prediction notes this week. And if your eating has narrowed a long way, ask your GP about a referral to a dietitian, because widening a diet back out is a job for someone who does it properly.

If you’re a GP or a gastroenterologist reading this, restrictive eating is worth screening for in IBS, and the referrer brief for gut-directed hypnotherapy, with the guideline positions set out and their limits stated, is available on request.

If you’d like the science in plain English once a week, plus one thing to try, join Gut Feelings at mindyourguts.co.uk/free-relaxation-page. The free relaxation recording comes with it.

About Mind Your Guts

Mind Your Guts is the Irritable Bowel Syndrome (IBS) blog written by Kathryn Dunn, a cognitive behavioural hypnotherapist based in York and working online. One piece of gut-brain research each week, in plain language, and one thing worth trying. More at mindyourguts.co.uk/gut-feelings.

Twelve Minutes of Calm. A free relaxation recording, about twelve minutes, for the times you want to feel calmer. It’s a general relaxation recording rather than a treatment for anything. Download it at mindyourguts.co.uk/free-relaxation-page and you’ll also join Gut Feelings, my weekly email, which carries each new post to your inbox along with a bit extra.

Hypnotherapy works alongside conventional medical care, never in place of it. This blog shares research for general information and is not a substitute for medical advice. Only a doctor can diagnose IBS. Always consult your GP or another relevant health professional. If your symptoms are new, changing, or accompanied by warning signs such as bleeding, unexplained weight loss, or persistent pain, please see your GP.

A note on this week’s topic. If your eating has narrowed a long way, if you’re losing weight, or if food has become a source of real distress, please talk to your GP, who can refer you to a dietitian or to specialist support. Beat, the UK’s eating disorder charity, also runs a free helpline and online support at beateatingdisorders.org.uk.

Sources

Kathryn Dunn

Back to Blog