Bananas and IBS – what’s the deal?

Written by: Amy Vaughan, RD
Reviewed by: Gina Giebner, RD

Bananas and IBS

Bananas and IBS can be a tricky balance to strike. 

They are often seen as gentle on the stomach, soft, portable, easy to digest and versatile, yet for some people with irritable bowel syndrome (IBS), they can lead to unexpected bloating or discomfort. Bananas contain fermentable oligosaccharides, disaccharides, monosaccharides and polyols (FODMAPs), a group of short-chain carbohydrates that can trigger symptoms such as pain, gas and changes in bowel habits in sensitive guts. 

What makes bananas particularly interesting, and sometimes confusing, is that their FODMAP content changes as they ripen.

If you have been through the low FODMAP diet, you will likely already know whether bananas affect you. But if you are still exploring your triggers, or have noticed a pattern with bananas and IBS symptoms in particular, this guide will help you understand how ripeness and portion size can affect your symptoms, and how to include bananas in a way that works for your gut.

Bananas and IBS: The role of ripeness

Greener or slightly firmer bananas are naturally lower in FODMAPs and higher in resistant starch, a type of carbohydrate that acts as a prebiotic, feeding beneficial gut bacteria and supporting digestive health.1

When these bacteria ferment resistant starch, they produce short-chain fatty acids (SCFAs) such as butyrate, which can help reduce inflammation and support a healthy gut lining.1

As bananas ripen, that resistant starch gradually breaks down into simpler sugars (including fructose). At the same time, their levels of fructans, a type of FODMAP, increase.2 This combination makes ripe or very ripe bananas sweeter but also more fermentable, which can lead to bloating or discomfort in sensitive guts.

When riper bananas can help

For some people, particularly those with constipation-predominant IBS (IBS-C), riper bananas can actually be easier to digest. Their softer texture and slightly higher sugar and water content can help support bowel regularity.2 The gentle increase in fructans as bananas ripen may also stimulate gut movement in some individuals, though this same fermentation can cause bloating or discomfort in others.

It is also worth noting that resistant starch and fructooligosaccharides (FOS) in bananas encourage the growth of beneficial bacteria that support gut health.1,2

So, while greener bananas tend to be gentler for most people with IBS, riper ones may still have their place. It is all about experimenting with what feels best for your body.

How to enjoy bananas with IBS

If you would like to keep bananas in your diet, it is usually about portion size and ripeness, rather than total avoidance.

Practical tips

  • Start small. Try a few slices and see how your body responds, especially if you are in the elimination phase of the low FODMAP diet. A firm banana (around 100 g) is considered low FODMAP, but once very ripe, the safe portion may be smaller.3
  • Go slightly green. Firmer bananas are typically easier to tolerate, and their prebiotic fibres may help your gut microbiota thrive.2,4
  • Pair well. Combine banana with low-FODMAP foods such as oats, lactose-free yoghurt or peanut butter to slow digestion.
  • Notice patterns. Track ripeness, portion and timing in your symptom diary.
  • Consider context. Stress, hormones, hydration and even sleep can influence IBS symptoms.

Other banana options
Plantain, while related to the banana, is low FODMAP according to Monash University and can generally be enjoyed freely.3 Banana chips are low FODMAP in small portions, but larger amounts can be problematic because with less water, their FODMAPs become more concentrated and it is easy to eat a higher volume without realising.3

Nutritional benefits
Bananas also provide soluble fibre such as pectin, which supports balanced gut flora and may help reduce inflammation.5 They are also a good source of potassium, a mineral that helps maintain fluid balance and regular bowel movements – another reason not to eliminate them unnecessarily.6

If bananas still seem to trigger symptoms

If you have tested ripeness and portion size but bananas still cause problems, you are not out of options:

  • Take a short break, then reintroduce gradually. Tolerance can change over time.
  • Swap in alternative fruits that are lower in FODMAPs but still provide prebiotic fibres, such as kiwi, citrus or strawberries.2
  • Be mindful of banana-based snacks like smoothies or banana bread, which often include other high FODMAP ingredients such as honey or dried fruit.
  • If bananas are a breakfast staple for you, you might find these low FODMAP breakfast ideas helpful.
  • If symptoms persist, speaking with a dietitian who specialises in IBS can help you fine-tune your food choices and make sure you are still meeting your fibre and nutrient needs.

Interestingly, even banana peels have been studied for their potential gut-health benefits. They are rich in fibre, polyphenols and antioxidants, which have anti-inflammatory effects and may support beneficial bacteria like Lactobacilli and Bifidobacteria, though most of us will probably stick to the fruit itself.7,8

The takeaway

When it comes to bananas and IBS, they can absolutely fit within an IBS-friendly diet. It is just about understanding what works for you. Ripeness and portion size make a real difference. Greener bananas tend to be lower in FODMAPs and higher in prebiotic resistant starch, while ripe bananas are sweeter and can be more fermentable for sensitive guts.

The same fibres that make bananas challenging for some are the ones that make them supportive for others. For people with fructose intolerance, bananas (alongside citrus fruits) are actually lower-fructose options, which may make them easier to tolerate.9

Rather than seeing bananas as something to avoid or rely on, it can help to view them as a flexible food, one that can support beneficial gut bacteria and, for many, contribute to a calmer, more resilient digestive system.2 

If you are still finding your balance with bananas and IBS symptoms, or other foods, our dietitians can help you identify your triggers, build variety back in, so book a free discovery call to discuss the way forward to feeling confident eating again.

References

  1. Chong, C. W., M. S. Liew, W. Ooi, et al. (2024). Effect of Green Banana and Pineapple Fibre Powder Consumption on Host Gut Microbiome. Frontiers in Nutrition 11: 1437645. [online] Available from: https://doi.org/10.3389/fnut.2024.1437645.
  2. Maqsood S, Arshad MT, Ikram A, Kodjo Théodore Gnedeka. (2025) Fruit‐Based Diet and Gut Health: A Review. Food Science & Nutrition. 2025 Apr 30;13(5) [online] Available from: https://doi.org/10.1002/fsn3.70159
  3. Monash University. Monash FODMAP Diet. Version 4.0.6 [iOS mobile application]. Available from: https://www.monashfodmap.com/ibs-central/i-have-ibs/get-the-app/
  4. Doriya, K., D. S. Kumar, and B. N. Thorat. (2022). A Systematic Review on Fruit-Based Fermented Foods as an Approach to Improve Dietary Diversity. Journal of Food Processing and Preservation  46, no. 11: e16994. [online] Available from: https://doi.org/10.1111/jfpp.16994.
  5. Donadio, J. L., J. P. Fabi, M. B. Sztein, and R. Salerno-Gonçalves. (2024). Dietary Fiber Pectin: Challenges and Potential Anti-Inflammatory Benefits for Preterms and Newborns. Frontiers in Nutrition  10: 1286138. [online] Available from:  https://doi.org/10.3389/fnut.2023.1286138.
  6. Dreher, M. L. (2018). Whole Fruits and Fruit Fiber Emerging Health Effects. Nutrients 10, no.12: 1833. [online] Available from: https://doi.org/10.3390/nu10121833.
  7. Li, B., Q. Gao, Y. Wu, et al. (2025). Broad-spectrum anti-inflammatory and antioxidant therapy of inflammatory-storm actuated diseases via programmable self-derived cryo-dead neutrophils. Chemical Engineering Journal 507:  160643. [online] Available from:  https://doi.org/10.1016/j.cej.2025.160643.
  8. Sivakanthan, S., S. Fawzia, T. Madhujith, and A. Karim. (2022). Synergistic effects of oleogelators in tailoring the properties of oleogels: A review. Comprehensive Reviews in Food Science and Food Safety  21, no. 4:  3507–3539. [online] Available from: https://doi.org/10.1111/1541-4337.12966
  9. Miles, E. A., and P. C. Calder. (2021). Effects of Citrus Fruit Juices and Their Bioactive Components on Inflammation and Immunity: A Narrative Review. Frontiers in Immunology  12: 712608. [online] Available from: https://doi.org/10.3389/fimmu.2021.712608.

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