Do I need to give up coffee for my gut?

Probably not. No UK guidance tells people in general to give up coffee for their gut. With IBS, the NHS suggests no more than 3 cups of tea, coffee or any other caffeinated drink a day, and coffee is on its list of things that can bring on heartburn. Below that, your own pattern is the guide.

Why does coffee make me need a poo?

Because it stirs up the muscles of your colon. In a study of 12 healthy adults, researchers measured pressure waves along the large bowel after different drinks. Caffeinated coffee increased the activity about as much as a 1,000 calorie meal did, 60 per cent more than warm water and 23 per cent more than decaf. Decaf sat in between, and the study was too small to separate it clearly from either water or ordinary coffee.

Twelve people in 1998 isn’t a large evidence base, so I hold it loosely. If you tend towards constipation, that push may suit you. If your IBS leans towards diarrhoea, it may be the opposite of what you want, and the usual diet advice for IBS with diarrhoea includes limiting caffeine from tea, coffee and soft drinks.

Is coffee bad for IBS?

Not necessarily, but the amount matters. The NHS advice for people with IBS includes not drinking more than 3 cups of tea, coffee or any other caffeinated drink a day, and that same limit has sat in the NICE guideline since 2008.

It’s worth knowing where the number comes from. The UK’s 2021 guideline for gut specialists describes this first line diet advice, limiting caffeine included, as based on clinical experience and on how these foods might set off symptoms, rather than on trials that tested it against anything else. So three cups is a sensible ceiling rather than a tested threshold. Your own limit may sit lower, or caffeine may make no difference to you at all.

Can coffee cause bloating or heartburn?

It can play a part in both. The NHS advice for reducing bloating includes not drinking lots of fizzy drinks, alcohol or caffeine in coffee and tea. For heartburn and acid reflux, coffee sits on the list of food and drink that can cause it or make it worse, alongside tomatoes, alcohol, chocolate and fatty or spicy food.

Neither list means coffee is the culprit for you. Lots of people get heartburn now and then with no obvious reason at all, and bloating has many causes. That’s why it’s worth testing rather than guessing.

What does UK guidance say about coffee?

That last row is worth a word. On long shifts my water bottle sat untouched on the nurses’ station for hours. If coffee is most of what you manage to drink on days like that, it does count towards your fluids, though water is still the healthy, cheap habit worth building. If your coffee is what’s propping up your afternoon, why you crash after lunch looks at what else is going on.

Does coffee count as a plant point?

Yes, a quarter of a point under the usual plant points convention, because the coffee bean is a seed. That’s a quarter for the week, not a quarter per cup, so a fourth cup adds nothing to your count. The detail is in does coffee count as a plant point.

How do I find out whether coffee is my trigger?

Change one thing at a time and write it down. If you swap your coffee, your breakfast and your evening drink all in the same week and feel better, you won’t know which one did it.

Count all your caffeine, not only the coffee. The IBS limit covers tea and any other caffeinated drink, and some soft drinks carry it too, so three coffees plus two teas is five cups, not three.

Keep your usual coffee for a few days and log when you drink it, what’s in it, and how your gut feels over the next few hours. Then cut back, swap one cup for decaf or water, and log the same way. A dated record beats a hunch, and it’s something a GP or dietitian can read quickly. If bloating is the main problem, how to stop bloating covers the other usual suspects. If you’d rather be pointed at a starting place, the which book quiz does that.

When it isn’t about the coffee

See a GP if you feel bloated regularly, if you’ve tried changing your diet and keep feeling bloated, or if you have bloating with weight loss you can’t explain or with blood in your poo. For heartburn, see a GP if you have it most days, if lifestyle changes and pharmacy medicines aren’t helping, or if you also have food getting stuck in your throat, frequently being sick, or losing weight for no reason. If you have bloating with a swelling or lump in your tummy, ask for an urgent GP appointment or call 111.