How to find out which foods make you bloated
Updated 29 October 2026
Write down what you eat and how you feel a few hours later, every day, for two to four weeks. Note when you ate as well as what. Then look for the meals that are followed by bloating more often than not, and test one suspect at a time. Most people find a short list of their own, not the long list they read online.
Why generic lists do not work
Lists of bloating foods are averages. Cabbage, beans, onions, fizzy drinks and big late meals cause gas for a lot of people, and the NHS names most of them. But plenty of people eat beans every week without a problem and bloat after a coffee on an empty stomach.
Cutting everything on the list at once usually helps a little and teaches you nothing. You will not know which change did it, and you will have given up foods you may not need to.
What to write down
- What you ate and drank, roughly how much, and the time.
- How your stomach felt two to four hours later, in a word or two.
- How you slept, how stressed the day was, and where you are in your cycle if you have one. All three change how a meal sits.
- Anything you would not think to count: chewing gum, sugar-free sweets, a fizzy drink at your desk.
Keep it short enough to do every day. A diary you keep for three weeks beats a detailed one you drop after four days. The NHS advice on IBS starts with exactly this: keep a diary of what you eat and any symptoms.
How to read it
Wait for repeats
One bad evening is noise. Look for a food or a habit that comes before bloating three or four times out of five.
Check the timing before the food
If every bad evening was a late dinner, the clock may matter more than the plate. Try finishing earlier for two weeks before you cut anything.
Test one thing
Leave out one suspect for a week, then bring it back on an ordinary day. If the bloating follows it back, you have found something. If not, you can keep eating it.
Write down the foods you are fine with
The foods you can stop worrying about are as useful as the ones you need to watch.
Where Ojafi fits
Ojafi keeps the diary with you. You log a meal and, a little later, how it sat. The Ojafi iPhone app, in review now, reads the diary over a few weeks, points at the meals and times that keep coming before a bad evening, and tells you which foods you can stop worrying about. You can start the same journal in your browser today.
When it is not just food
Questions people also ask
- How long does it take to find a food trigger?
- Usually two to four weeks of daily notes. You need each suspect food to come up several times, on different days, before a pattern means anything.
- Should I cut out gluten or dairy to see if it helps?
- Not as a first step, and not both at once. Keep a diary first. If one food keeps coming before bloating, leave out that one for a week and bring it back. Cutting out whole food groups for a long time is worth doing only with a dietitian.
- Can stress or sleep cause bloating?
- They can change how a meal sits. That is why a useful diary notes sleep and stress next to the food.
- Is bloating before my period normal?
- Many people feel bloated around their period, and the NHS lists it as a common cause. A diary that includes your cycle helps you tell those days apart from food.
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Ojafi gives general food guidance. It is not medical advice and does not diagnose or treat any condition. See our medical disclaimer.