Irritable Bowel Syndrome (IBS) is a complex condition, and there is rarely a single approach that works for everyone.
Symptoms, dietary triggers and individual tolerance can vary considerably, which is why a personalised approach to diet and lifestyle is so important.
The digestive system does much more than simply process food. It plays an important role in nutrient absorption, interacts closely with the immune system and communicates with the brain through the gut–brain axis. The gut microbiome – the community of microorganisms living within the digestive tract – is also an increasingly important area of research in digestive and wider health.
Recognising IBS symptoms
For people living with IBS, one of the frustrations can be experiencing very real symptoms despite routine investigations being reported as normal. IBS commonly involves abdominal pain or discomfort alongside changes in bowel habits.
Common symptoms can include
✓ Abdominal pain or cramping
✓ Bloating
✓ Excessive wind
✓ Constipation
✓ Diarrhoea
✓ Alternating constipation and diarrhoea
The pattern and severity of symptoms can differ significantly from person to person, reinforcing the importance of taking an individual approach.
Looking beyond individual symptoms
IBS is complex, and several factors may influence an individual's symptoms. Rather than focusing on a single potential trigger, considering diet and lifestyle together can help build a more complete picture.
Diet & food tolerance Gut microbiome Stress & lifestyle Previous antibiotic use Sleep & wellbeing Eating patterns
Starting with the basics
For people with IBS, established dietary and lifestyle guidance provides a useful starting point.
Practical starting points
✓ Eat regular meals and take time to eat
✓ Avoid skipping meals or leaving long gaps between them
✓ Drink sufficient fluids, particularly water and non-caffeinated drinks
✓ Limit tea and coffee to around three cups per day
✓ Reduce alcohol and fizzy drinks
✓ Consider the amount and type of fibre within the diet
✓ Limit fresh fruit to around three portions per day
✓ Avoid sorbitol where diarrhoea is a concern
✓ Consider oats and linseeds where wind and bloating are problematic
Fibre deserves particular consideration because not all types of fibre behave in the same way. Insoluble fibre, such as bran, can aggravate symptoms for some people with IBS. Where additional fibre is recommended, soluble sources such as oats or ispaghula may be better tolerated. As with any dietary change, individual response should be monitored.
What about probiotics?
Probiotics are another area of interest in gut health, although responses can differ between individuals and products.
NICE advises people with IBS who choose to try a probiotic to take it for at least four weeks, at the manufacturer's recommended dose, while monitoring the effect on their symptoms.
This is a useful reminder of a broader principle in nutrition: introduce changes in a structured way and assess how the individual responds, rather than making numerous changes at once.
When further dietary support is needed
If symptoms persist despite general dietary and lifestyle measures, more structured dietary approaches may be considered.
These can include identifying specific food triggers, individual food avoidance or professionally supervised exclusion approaches such as a low-FODMAP diet.
Important: Because restrictive diets can reduce dietary variety and potentially affect nutritional intake, they should be appropriately managed by a healthcare professional with expertise in dietary management.
How we eat matters too
Take time to eat and chew thoroughly
Chewing physically breaks food down and mixes it with saliva as the first stage of digestion. Slowing down and taking time over meals can also help prevent the rushed eating habits that often accompany busy lifestyles.
Consider the gut–brain connection
The digestive system and brain communicate closely through the gut–brain axis, and stress can influence gastrointestinal function and symptoms.
Creating time to eat away from work and other distractions, alongside broader approaches to managing stress, supporting good-quality sleep and remaining physically active, can form part of a more rounded approach to IBS management.
Aim for a varied, balanced diet
Where tolerated, a varied diet can provide a broad range of nutrients and different sources of dietary fibre. Foods such as vegetables, fruit, wholegrains, protein sources, oily fish, nuts and seeds can all contribute to a balanced diet.
The important qualification for people with IBS is individual tolerance. Foods that work well for one person may exacerbate symptoms for another.
Food Choice
Personalisation matters
There is no universal list of “good” and “bad” foods for IBS.
Foods such as onions, garlic, pulses, apples and certain fermented foods can contribute valuable nutrients and dietary fibre, but they may also be poorly tolerated by some individuals with IBS.
Rather than unnecessarily removing large numbers of foods, a more useful approach is to understand personal tolerance and make dietary changes in a structured way. A food and symptom diary can be helpful in identifying patterns.
Putting it all together
Seven foundations for supporting gut health
There is rarely a quick fix for IBS. Instead, it can be helpful to think about digestive health as part of a broader picture built around seven foundations.