Are bananas low FODMAP? Why ripeness changes the answer

Firm bananas are low FODMAP; ripe bananas are high in fructans unless the serving is small. Monash University re-tested bananas and now rates them by ripeness: firm bananas as low in oligo-fructans, and ripe bananas as high. A small serving of ripe banana, around a third of one, may still suit many people.

Fructans are one of the FODMAP groups, the same group found in wheat, garlic and onion. If fructans are among your triggers, the difference between a just-yellow banana and a soft, speckled one can be noticeable. If they aren’t, you may not need to think about it at all.

This guide explains why ripeness matters, how to choose and use bananas during the elimination phase, what to know about banana chips, banana bread and smoothies, and how bananas fit with other conditions. New to FODMAPs? Start with our low-FODMAP guide for IBS.

Monash re-tested bananas in 2017, partly because people reported discomfort with ripe ones. In its update on bananas, it gave a few possible reasons fructans may be higher than earlier testing suggested:

• Plants make more fructans under stress. Monash notes that bananas’ fructan content increases when they are stored and ripened in cold storage, which is common for supermarket fruit.
• Variety matters. Farmers may favor higher-fructan varieties because they resist pests and disease better.
• Growing and storage conditions vary. In a separate article on food processing and FODMAPs, Monash lists ripeness, plant variety, climate, soil, storage time and storage temperature as factors that can all change a plant food’s FODMAP content.

That last point is a useful reminder: lab ratings are a guide, and two bananas from different shops may not be identical. Your own response, tracked over time, is the most useful information you have.

Monash’s own recipes reflect the ratings. Its oat and banana pancakes use firm bananas, and its low-FODMAP shopping list lists "banana (firm)" rather than bananas in general. A few practical ideas:

• Buy them less ripe. A firm banana with little or no brown speckling is the closer match to Monash’s low-FODMAP rating.
• Use ripe ones in small amounts. A few slices on cereal or in a smoothie, rather than a whole soft banana.
• Spread fruit across the day. Several fruit servings at once can add up. Our guide to FODMAP portion sizes explains how.
• Watch the rest of the bowl. Oats, yogurt, honey and dried fruit all have their own FODMAP content. See are oats gluten-free for the oat side of breakfast.
• Check the Monash app for current tested servings at each ripeness.

Monash’s message is reassuring: if you tolerate ripe bananas well, there is no need to cut them out. As its update puts it, your eating only needs to be as strict as your symptoms require.

Bananas show up in many forms, and the other ingredients often matter more than the fruit:

If you need to avoid gluten, look for banana bread labeled gluten-free and read the ingredients for your other triggers. Our guide to hidden sources of gluten has more on baked goods.

Histamine intolerance. Bananas often appear on lists of foods to limit. A 2018 review in the journal *Foods* on biogenic amines in plant foods found no detectable histamine in bananas, but high levels of putrescine, another amine. The authors suggest that foods like this may be left off low-histamine lists because of other amines, which may compete with histamine for the same breakdown enzyme. A 2025 review notes that exact food lists aren’t possible with current evidence. Tolerance is personal; our histamine intolerance guide covers how to test yours with professional support.

Latex-fruit syndrome. Some people with a latex allergy also react to certain fruits. A 2024 review in the *Journal of Clinical Medicine* found banana, avocado, kiwifruit and papaya were the fruits most often involved, with reactions ranging from mouth itching to anaphylaxis. Banana isn’t one of the US top 9 allergens, so it won’t be highlighted on labels in the same way. If you have reacted to bananas or latex, talk to an allergist. Call emergency services for any severe reaction. Our guide to food allergies and the major allergens has more.

If bananas, or ripe bananas, are one of your triggers, other fruits can fill the same spot. Check each one against your conditions and the Monash app for servings. For more ideas, see high-FODMAP foods and swaps.

• A firmer banana, or a smaller piece of a ripe one.
• Another fruit you already tolerate on cereal or in smoothies, checked in the Monash app for a low-FODMAP serving. (If you have latex-fruit syndrome, remember kiwifruit and papaya are also commonly involved.)
• A spoon of peanut butter for creaminess in a smoothie, unless you have a peanut allergy.

Talk to your doctor or a registered dietitian if you are thinking of cutting out fruit, if you are unsure whether fructans or something else are behind your symptoms, or if your symptoms change. A dietitian can guide you through the low-FODMAP phases, including testing fructans in a structured way, and a simple food and symptom diary helps you both see patterns. Unexplained weight change, bleeding or fever are reasons to see your doctor promptly.