Irritable Bowel Syndrome (IBS) is a common digestive condition characterised by symptoms such as bloating, abdominal pain, diarrhoea, constipation, or a combination of both. While it can be persistent and have a major negative impact on your comfort, IBS can often be effectively managed through a combination of dietary, lifestyle, and targeted supportive strategies.

IBS is considered a functional gastrointestinal disorder, meaning there is no visible structural issue however gut function is altered. Several factors are thought to contribute to the occurrence of IBS including imbalance gut microbiome, dietary triggers,  visceral hypersensitivity within the gastrointestinal tract and gut-brain axis disruption. Because IBS is multifactorial, management typically requires a personalised, multi-step approach and below we have outlined some clear and practical strategies to consider when aiming to help manage your IBS.

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Low FODMAP Diet

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The low FODMAP diet is one of the most evidence-supported strategies for IBS. FODMAPs are fermentable short-chain carbohydrates that can be poorly absorbed by the small intestine and then rapidly fermented by gut bacteria leading to symptoms such as gas, bloating and abdominal pain. Common high FODMAP foods include onions, garlic, wheat-based products, certain fruits such as apples and pears, some dairy products and legumes.

Research has repeatedly shown that a low FODMAP diet can significantly alleviate IBS symptom severity (such as abdominal pain and bloating), improve bowel habits and enhance digestive comfort. 

A structured approach to identifying potential dietary triggers involves carefully monitoring which foods you consume and when you experience symptoms using a tool such as Evolv or by keeping a food and symptom diary. A simple method would be as follows:

1. Elimination phase (short-term restriction) - Restrict your consumption of all potential triggers and high-FODMAP foods.

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2. Reintroduction phase (testing tolerance) - Slowly introduce one potential trigger food back into your diet and monitor whether or not you experience any symptoms following its consumption. Repeat this step as you work through each potential trigger high-FODMAP foods, testing a single food at a time.

3. Personalisation phase - Once you have identified which high-FODMAP foods trigger your IBS, you can move away from strict elimination to reintroduce tolerated high-FODMAP foods that did not cause IBS symptoms and begin following a personalised, sustainable diet.
   
   

Support a Healthy Balanced Microbiome

Imbalances within the gut microbiome imbalances -specifically reduced diversity, lower beneficial bacteria (such as Bifidobacterium, Lactobacillus), and increased harmful pathogenic bacteria (such as E. coli) - are strongly linked to the development of IBS. The gut microbiome is vital to digestive health and imbalances can trigger inflammation, visceral hypersensitivity, and altered motility.

Potential options that can help support your gut microbiome include:

• Probiotics: Boost healthy bacteria and yeasts and can help restore the natural balance of microorganisms
• Prebiotics: Act as “fertilizer” by providing specialised, non-digestible plant fibres which nourish beneficial bacteria in the gut microbiome
• Diet diversity: Once tolerated foods are identified, a varied diet supports microbiome health

It is important to introduce any new probiotic or prebiotic supplements gradually and monitor your tolerance to the product.

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Manage Stress and the Gut–Brain Axis

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The digestive system is closely connected to the nervous system and increasing attention is being given to the Gut-Brain Axis. In reflection of this relationship between digestive health and cognitive health and wellbeing, stress has been shown to significantly influence IBS symptoms. For instance, one review found that just prior to progressing to an IBS patient individuals reported significant increases in their stress levels through stressor scores.

If you recognise that you are struggling with high levels of stress and believe this may be contributing to your experience of IBS, it is worth trying stress management techniques such as gentle exercise, meditation, breathing techniques, and even talking to a professional such as a therapist in severe cases of stress. 

Improve your Digestive Health

Improving how food is digested can reduce IBS symptoms such as bloating and discomfort. Simple lifestyle changes such as eating regularly and avoiding large heavy portions, limiting highly processed foods and excess fat consumption and eating slowly can make all the difference in relieving IBS symptom severity and supporting a comfortable life. Additionally, it can be important to ensure you are consuming the right type of fibre to contribute to your digestive health if you have IBS. Soluble fibre such as oats and psyllium is generally beneficial, however insoluble fibre such as wheat bran can worsen IBS symptoms in some individuals.

Conclusion

IBS is a complex condition, however a range of strategies and lifestyle changes can help to manage IBS symptom severity and provide valuable relief from digestive discomfort. A low FODMAP diet is often a useful starting point for alleviating IBS symptoms, and your diet, stress levels and general digestive health all play important roles in the occurrence of IBS making them ideal places for changes to reduce IBS severity.

Personalisation is essential for long-term success when trying to manage your IBS and focusing on tracking the foods you consume and the experience of symptoms is key to identifying your specific health needs and what strategies work best for you.

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Sources

https://pmc.ncbi.nlm.nih.gov/articles/PMC10095554/ 

https://www.frontiersin.org/journals/microbiology/articles/10.3389/fmicb.2019.01136/full 

https://pmc.ncbi.nlm.nih.gov/articles/PMC4202343/ 

https://www.sciencedirect.com/science/article/pii/S0261561422003867 

https://pubmed.ncbi.nlm.nih.gov/38337655/