Irritable Bowel Syndrome is one of the most common gastrointestinal conditions. It is characterised by chronic abdominal pain, bloating, and changes in bowel habits, including constipation, diarrhea, or a combination of both, in the absence of structural or inflammatory disease.
One of the most important things to understand about IBS is that it is deeply individual. Triggers, tolerances, and responses to dietary change vary significantly from person to person. This plan provides an evidence-informed framework, but working closely with a healthcare provider or registered dietitian is strongly recommended to adapt it to your specific needs and monitor your progress over time.
This plan is intended as a short-term dietary intervention, not a permanent way of eating.
The Research: Macros, Adjunctive Foods & Guiding Principles
Macronutrient Framework
In IBS, overall food quality and trigger avoidance have a greater impact on symptom management than macro ratios alone. The specific macro distribution matters less than consistency with a low-trigger, whole-food eating pattern. We use a practical macro range to keep meals balanced and predictable: 20–25% protein, 40–55% carbohydrates, and 20–35% fat.
Protein: Kept moderate to support satiety without crowding out fibre and low-FODMAP carbohydrates; very high intakes may worsen constipation in some individuals.
Carbohydrates: The plan prioritises low-FODMAP carbohydrate sources, with an emphasis on easily digestible, gut-friendly options that minimise fermentation and gas production.
Fat: The plan emphasizes moderate, unsaturated fat intake. High fat meals can stimulate gut contractions and worsen symptoms in some people with IBS.
Adjunctive Nutrition Strategies
The following foods are woven throughout this plan based on their specific evidence in IBS.
Soluble fibre: Well-supported for improving stool consistency and abdominal discomfort in IBS, and is often better tolerated than many other fibre types.
Ginger: A tasty spice and may support gastric motility and has been studied for its role in reducing bloating, cramping, and nausea associated with IBS.
Turmeric: The active compound curcumin has been studied as an adjunct for IBS symptoms (particularly abdominal pain).
Fennel: Has antispasmodic properties with evidence supporting reductions in bloating and cramping in IBS.
Adjunctive ingredients are adapted based on individual allergies, food preferences, and personal trigger foods.
Guiding Principles
Low-FODMAP eating: The plan is built around a low-FODMAP diet. FODMAPs — Fermentable Oligosaccharides, Disaccharides, Monosaccharides, and Polyols — are short-chain carbohydrates that are poorly digested in the small intestine and rapidly fermented by gut bacteria, producing gas and triggering symptoms in people with IBS. Reducing high-FODMAP foods is one of the most evidence-supported dietary strategies for IBS symptom management.
Mediterranean dietary pattern: Within the low-FODMAP framework, the plan follows a Mediterranean-style eating pattern, emphasising whole foods, plant-based variety, and anti-inflammatory fats. Early research supports the Mediterranean diet as a complementary approach to IBS management alongside low-FODMAP principles.
Limitations & Safety
Diet is one piece of a larger picture. Nutrition plays a significant and well-researched role in managing IBS symptoms, but the most effective outcomes come from a comprehensive approach guided by your healthcare provider. This meal plan is designed to complement, not replace, medical care.
This is a short-term dietary intervention. The low-FODMAP framework is not intended as a permanent way of eating. Research supports its use as a short-term elimination approach, typically in the range of 4 to 6 weeks, after which dietary adjustments should be guided by a healthcare provider or registered dietitian.
Work with your team. IBS is highly individual, and this plan works best when supported by professional guidance. We strongly encourage you to share this plan with your doctor or dietitian, who can help monitor your progress and adapt the approach to your specific triggers and tolerances.
Medications. If you are taking any prescription or over-the-counter medications, speak with your healthcare provider before making significant dietary changes.
This plan is evidence-informed, not individually prescribed. While the plan is built around your inputs and the best available research, it is not a substitute for one-on-one advice from a registered dietitian who can assess your full clinical picture.
The gut-brain connection is real. Stress and anxiety are well-documented triggers for IBS symptoms, and the relationship between mental and digestive health runs in both directions. If you find that emotional wellbeing is significantly impacting your symptoms, we encourage you to speak with a qualified professional who can support both aspects of your health.
This plan does not cure IBS, and individual results will vary.
Who This Plan Is Not For
This plan is not appropriate for everyone. It is not suitable for those with Inflammatory Bowel Disease (IBD), including Crohn's disease or ulcerative colitis, or those managing certain overlapping health conditions.
It is also not appropriate for anyone currently experiencing unexplained symptoms that have not yet been investigated by a healthcare provider, including unintentional weight loss, rectal bleeding, persistent vomiting, fever, or a recent significant change in bowel habits. These symptoms require medical evaluation before any dietary intervention is started.
See our full eligibility guide for details.
References
- Bamidele, J. O., et al. (2025). The Mediterranean diet for irritable bowel syndrome: A randomized clinical trial. Annals of Internal Medicine, 178(12), 1709–1717.
- Bertin, L., et al. (2024). The role of the FODMAP diet in IBS. Nutrients, 16(3), 370.
- Böhn, L., et al. (2015). Diet low in FODMAPs reduces symptoms of irritable bowel syndrome as well as traditional dietary advice: A randomized controlled trial. Gastroenterology, 149(6), 1399–1407.e2.
- Ford, A. C., et al. (2008). Effect of fibre, antispasmodics, and peppermint oil in the treatment of irritable bowel syndrome: Systematic review and meta-analysis. BMJ, 337, a2313.
- Jafarzadeh, E., et al. (2022). Turmeric for treatment of irritable bowel syndrome: A systematic review of population-based evidence. Iranian Journal of Public Health, 51(6), 1223–1231.
- Halmos, E. P., et al. (2014). A diet low in FODMAPs reduces symptoms of irritable bowel syndrome. Gastroenterology, 146(1), 67–75.e5.
- Lacy, B. E., et al. (2021). ACG Clinical Guideline: Management of irritable bowel syndrome. The American Journal of Gastroenterology, 116(1), 17–44.
- Li, Y., et al. (2024). Association between dietary protein intake and constipation: Data from the National Health and Nutrition Examination Survey 2005–2010. Neurogastroenterology & Motility, 36(6), e14795.
- Nikkhah Bodagh, M., et al. (2018). Ginger in gastrointestinal disorders: A systematic review of clinical trials. Food Science & Nutrition, 7, 96–108.
- El-Salhy, M., et al. (2017). Dietary fiber in irritable bowel syndrome (Review). International Journal of Molecular Medicine, 40(3), 607–613.
- Portincasa, P., et al. (2016). Curcumin and fennel essential oil improve symptoms and quality of life in patients with irritable bowel syndrome. Journal of Gastrointestinal and Liver Diseases, 25(2), 151–157.
- Singh, P., et al. (2025). Efficacy of Mediterranean diet vs. low-FODMAP diet in patients with nonconstipated irritable bowel syndrome: A pilot randomized controlled trial. Neurogastroenterology & Motility, 37(10), e70060.
- Siragusa, N., et al. (2025). The ten dietary commandments for patients with irritable bowel syndrome: A narrative review with pragmatic indications. Nutrients, 17(15), 2496.
- Zhang, J., et al. (2019). The role of dietary energy and macronutrients intake in prevalence of irritable bowel syndromes. BioMed Research International, 2019, 8967306.