Kiwi and IBS: The Surprising Fruit That May Help IBS-C
Kiwi is unusual among fruits in the IBS context: it is not just relatively safe from a FODMAP perspective, but there is actually clinical trial evidence supporting its use for improving constipation symptoms in IBS-C. If you have constipation-predominant IBS, kiwi deserves a closer look.
Kiwi and FODMAPs
Green kiwi (the common Hayward variety) is classified as low-FODMAP by Monash University at a serving of 2 kiwis. This makes it one of the safer fruit options for people with IBS on a low-FODMAP diet. Gold kiwi (Zespri SunGold) also falls in the low-FODMAP range at 2 fruits, though it is slightly higher in fructose.
Clinical Evidence for Kiwi and IBS-C
A randomised controlled trial published in the American Journal of Gastroenterologycompared eating two green kiwi per day to psyllium and a prune intervention. The kiwi group showed significant improvements in weekly complete spontaneous bowel movements, stool consistency, and lower rates of abdominal discomfort compared to baseline.
The proposed mechanisms include:
- Actinidin: A proteolytic enzyme unique to kiwi that may support gastric emptying and improve small intestinal transit
- Soluble fibre: Kiwi contains a distinctive pectin-type soluble fibre that forms a gel in the gut, supporting stool consistency and transit without excessive fermentation
- Water content: Kiwi is approximately 83% water, contributing to stool hydration
Kiwi for IBS-D
The evidence is primarily for constipation. For IBS-D (diarrhoea-predominant IBS), kiwi's mild laxative properties mean it should be introduced cautiously. Start with one kiwi rather than two and track your gut response before increasing.
Gold Kiwi vs Green Kiwi
Gold kiwi is sweeter and lower in actinidin than green kiwi. If you are eating kiwi primarily for its motility-support properties (IBS-C), green kiwi may be more effective. If taste is the primary concern, gold kiwi is more palatable and similarly low-FODMAP.
How to Incorporate Kiwi
The research protocol used two kiwis eaten daily with breakfast. Results in the trials appeared over 4 weeks of consistent consumption, suggesting that regular daily intake produces better outcomes than occasional eating.
Related Reading
Medical Disclaimer: Educational only; not medical advice.
Use Sensio to track kiwi intake and its effect on your daily gut symptoms over time.