IBS - a new dietary approach (that works!)

IBS is an incredibly common condition affecting 1 in 5 people. It's severity and symptoms can range from mild bloating and constipation to debilitating pain and diarrhoea. A diagnosis of IBS is usually made by your GP or gastroenterologist after other causes have been ruled out e.g. Coeliac disease, Crohn's disease, ulcerative colitis. Until recently, the standard advice from the NHS has been to cut down on caffeine, alcohol, fruit juice, stop smoking, increase fibre and reduce stress.

Unfortunately, for many, this advice only has limited success. In fact, increasing fibre can often make symptoms worse.

New research from Monash University, Australia and King's College, London shows that the gas, bloating, diarrhoea/constipation are caused by certain fermentable sugars and fibres. Gut bacteria live in the large intestine (colon), and they feed on these fermentable foods producing gas and drawing in water. People with IBS may have an imbalance of the gut bacteria causing excessive gas and diarrhoea to be produced, and may also have guts that are more sensitive to the gas production. This sensitivity is felt as pain.

The scientific term for these fermentable foods is 'FODMAPs' which stands for Fermentable Oligosaccharides, Disaccharides, Monosaccharides, and Polyols. Quite a mouthful! Surprisingly, foods that are generally thought to be very healthy and good for the bowels can be high in these FODMAPs.

Common high FODMAP foods include apples, pears, garlic, onions, wheat, honey, beans, lentils, soy and lactose (found in milk, yogurt and ice-cream). Not everyone with IBS reacts badly to all of these foods. 

What is a low FODMAP diet?

The aim of a low FODMAP diet is to establish which of these foods are causing the IBS symptoms. For approximately four weeks high FODMAP foods are eliminated from the diet until symptoms resolve. Some people see significant improvement within days, for others it can take a few weeks. The next stage of the diet is to systematically reintroduce the high FODMAP foods to discover which ones cause the symptoms. This allows particular trigger foods to be identified.

Does it help IBS?

Scientific studies show that the low FODMAP approach is effective in 3 out of 4 people, which is a significant improvement on previous treatments. It is so successful that gastroenterologists now recommend the diet for their IBS patients. It is routinely used in major hospitals such as Guy's & St Thomas' in London.

Just remember, if you have IBS it does not mean that you need to eliminate all high FODMAP foods forever. The goal is to identify the ones causing you problems, so that you can eat as wide a variety of foods as possible while minimising IBS symptoms. Life changing for many!

Nutritionist Resource is not responsible for the articles published by members. The views expressed are those of the member who wrote the article.

Share this article with a friend

Written by Sarah Danaher BSc MSc Registered Dietitian

The COVID-19 pandemic has led to unprecedented expansion of and challenge to critical care services. This has required significant re-structuring of both NHS and private dietetic services to ensure that we are able to provide a safe and effective service during this time.
As well as providing NHS Covid-19 pandemic support, I can also offer private FaceTime and Skype for people feeling they … Read more

Written by Sarah Danaher BSc MSc Registered Dietitian

Show comments

Find a nutritionist dealing with irritable bowel syndrome (IBS)

All therapists are verified professionals.

Related Articles

More articles