lifestyle · for gut health & ibs support
Low-FODMAP Dietary Approach for IBS
Reviewed by the Nimbera editorial team · Last updated May 2026
How to use
Phase 1 (2-6 weeks): Strictly avoid high-FODMAP foods including wheat, onion, garlic, apples, pears, milk, legumes, and high-fructose corn syrup. Use Monash University's free FODMAP app to check specific foods. Phase 2 (6-8 weeks): Systematically reintroduce FODMAP groups one at a time, every 3 days, to identify personal triggers. Phase 3: Long-term personalised diet based on individual tolerance. Ideally guided by a registered dietitian experienced in IBS.
How it works
FODMAPs (Fermentable Oligosaccharides, Disaccharides, Monosaccharides, and Polyols) are short-chain carbohydrates that are poorly absorbed in the small intestine. In IBS patients, they draw excess water into the bowel and are rapidly fermented by gut bacteria, producing gas, bloating, cramping, and altered bowel habits.
Where to buy
No product to buy. Use the Monash University FODMAP Diet App ($8.99 one-time) for food checking. FODMAP-certified products are available at some health food stores. Consider a consultation with a registered dietitian - search eatright.org for FODMAP-trained practitioners.
Typical cost: Free (self-guided) to $100-$300 for dietitian consultations
Safety notes
The low-FODMAP diet is highly restrictive and not intended as a permanent diet - it is a diagnostic elimination protocol. Long-term restriction without reintroduction can reduce microbiome diversity. Not appropriate for people with a history of eating disorders without professional supervision. Does not address IBS caused by SIBO, coeliac disease, or IBD - these must be ruled out first.
Drug & supplement interactions
- Always tell your doctor or pharmacist about any supplements you take.
- Interactions can occur with prescription medications, blood thinners, and immunosuppressants.
- Herbal remedies can affect how the body absorbs or metabolises drugs.
- Check drugs.com interactions checker before starting.
Clinical source
Black et al., Efficacy of low FODMAP diet in IBS: SR & network meta-analysis, Gut, 2022This information is compiled from primary clinical literature and is for informational purposes only. It is not a substitute for professional medical advice. Read our full disclaimer.