Coffee itself contains few FODMAPs, but plenty of people with IBS still notice it soon after the first cup. That's usually down to the caffeine and what you add to the cup. Most people don't need to give coffee up entirely. Changing the type, the amount or the add-ins is often enough.
Is Coffee Low FODMAP?
Plain black coffee is low in FODMAPs. Coffee beans don't contain much of the fermentable carbohydrates that cause trouble on the diet. In the Stummy database, regular coffee is listed as moderate, mainly to reflect how often it bothers people with IBS, and decaf is listed as low.
So if coffee sets off symptoms, FODMAPs may not be the main reason. Caffeine and the extras in the cup usually matter more.
What Research Shows
In an analysis of nearly 10,000 food and symptom diaries from a smartphone app, mostly from people with IBS, caffeinated coffee was strongly associated with diarrhea within one to two hours of drinking it.1 This kind of study shows a link rather than proving cause, but it matches what many people report. In a separate survey of people with IBS, coffee was among the foods and drinks they most often linked to their symptoms.2
Why Coffee Can Upset IBS
- It gets the colon moving. Coffee is thought to stimulate contractions in the large intestine. That's helpful for some people with constipation, and the opposite of helpful for people with IBS-D.
- Caffeine affects the gut and the nervous system. It can increase alertness and, for some people, anxiety, which can make gut symptoms feel worse.
- Acidity and reflux. Some people get heartburn from coffee, especially on an empty stomach.
- The add-ins. Milk, syrups and sweeteners can bring FODMAPs into an otherwise low FODMAP drink.
Decaf still contains some of coffee's other compounds, so it doesn't suit everyone, but many people find it much gentler.
What You Add Matters
| Add-in | FODMAP note | Easier option |
|---|---|---|
| Regular cow's milk | Lactose; high in larger amounts | Lactose-free milk |
| Oat milk | High FODMAP in larger amounts | Almond milk (check for inulin) |
| Soy milk | Depends on how it's made; ours lists it as low | Check the label for "soy protein" rather than whole soybeans |
| Honey, agave | Excess fructose | Regular sugar or maple syrup |
| Sugar-free syrups | Often sweetened with sugar alcohols | A small amount of regular syrup |
| Whipped cream | Small amounts of lactose | A small dollop is usually fine |
Coffee Shop Orders That Tend to Work
- Espresso, americano or long black
- A small latte or flat white with lactose-free milk
- Decaf versions of any of the above
- Cold brew with a splash of lactose-free or almond milk
Large milk-based drinks like a big latte or a frappe are the ones to be careful with, since they contain a lot of milk plus syrups.
Tips if Coffee Bothers You
- Try decaf for a week and see whether your symptoms change.
- Have a smaller cup, or fewer cups a day.
- Drink it with food rather than on an empty stomach.
- Change one thing at a time. If you switch to decaf and lactose-free milk on the same day, you won't know which helped.
- Track timing and symptoms in an IBS food diary. Coffee-related symptoms usually show up within a couple of hours.
What About Tea?
If you're cutting back on coffee, tea is a common alternative. Green tea and peppermint tea are low FODMAP in our data. Black tea is moderate when brewed strong, while chamomile and fennel tea are high. Weak chai is low, but strong chai is high.
Finding Your Own Pattern
Low FODMAP ratings depend on how much you have3, and many people with IBS link specific foods or drinks to their symptoms.2 Your own pattern is the best guide. Some people with IBS drink coffee every day without trouble, while others feel much better on decaf. Test it and see which group you're in.
Check milks, syrups and sweeteners in our FODMAP checker. For other drinks, see alcohol and IBS and our low FODMAP smoothies.
