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Could SIBO be responsible for your IBS?

Updated: Nov 21, 2022

Do you have digestive symptoms similar to Irritable Bowel Syndrome? Or always thought your digestive distress was due to indigestion. Recent research is showing us that SIBO (Small Intestinal Bacterial Overgrowth) is more prevalent than was previously thought and symptoms can range from abdominal bloating, constipation, very mild to chronic diarrhoea, weight loss and malabsorption of nutrients (1).

What is SIBO?

Small Intestinal Bacterial Overgrowth is a condition where there is an accumulation of bacteria in the small intestine. This overgrowth of bacteria, which should normally reside in the large intestine, can interfere with our normal digestion and the absorption of our food and nutrients. These bacteria consume our food and then produce gas within our small intestine. This gas can cause abdominal bloating, pain, constipation, diarrhoea, belching and/or flatulence.

The main symptoms of SIBO are the same as Irritable Bowel Syndrome (IBS), and it is thought that SIBO is the underlying cause of IBS, as SIBO exists in up to 84% of IBS patients. It is also associated with many other diseases including Diabetes, Celiac disease, and Inflammatory Bowel Disease (2).

How do we know if we have it?

A hydrogen breath test can be used to measure hydrogen and methane gases produced by the bacteria. A sugary solution of lactulose or glucose is consumed after a 1 or 2-day preparatory diet and then several breath samples are taken over a short period of time. The results of this test can help your practitioner to determine the types and amounts of gas present.

This is important to know because there are differing protocols for the removal of the bacteria, which usually consists of antibiotics and/or specific antimicrobial herbs, nutritional supplements, and a change in the diet.

As the relapse rate is high, it takes perseverance and commitment to get the gut flora back into balance.

Those susceptible to SIBO and even Candida albicans overgrowth (which is often

associated with SIBO) are advised to follow a long-term diet low in carbohydrates, especially refined carbohydrates such as white bread, baked goods, pasta, and sugar. Cooking from scratch is usually the best way to ensure the diet is composed of plenty of fresh

vegetables, healthy fats, good quality protein sources and small amounts of complex carbohydrates such as quinoa, millet and buckwheat.

There are several different diets that may be recommended to follow, all of which reduce carbohydrates. These include the SIBO Specific Food Guide (SSFG), a 2-phase diet (SIBO bi-phasic diet), the Specific Carbohydrate diet (SCD), and a low FODMAP’s diet.

It is extremely important to remove the bacterial overgrowth as soon as possible, as SIBO left untreated can cause many potential health complications, due to malnutrition and

vitamin and mineral deficiencies (3).

SIBO could potentially be a root cause of many food intolerances such as gluten, casein, lactose and fructose, and it is also associated with autoimmune diseases, chronic fatigue syndrome and fibromyalgia, and vitamin B12 deficiency.

What can you do about it?

If you think you may have SIBO, a full nutrition consultation can help to determine if

testing is suitable, and a dietary and supplement programme may be recommended.

My Simple Gut ReSet is designed to help us get to the root cause or causes of your health issues. The aim is to nourish and support the gut lining to assist it back to a healthy state. A robust intestinal lining is an essential first step for finding freedom from painful, frustrating and embarrassing symptoms of IBS and other gut-related symptoms and health problems.

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'10 Ways to Assist the Digestive Process' and 'Causes of IBS and Natural Ways to find Relief from your Symptoms'

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1. Dukowicz, A.C., Lacy, B.E. & Levine, G.M., 2007. Small intestinal bacterial overgrowth: a comprehensive review. Gastroenterology & hepatology, 3(2), pp.112–22. Available at:

2. Small Intestinal Bacterial Overgrowth website by Dr Allison Siebecker found at

3. Murphy, M.F. et al., 1986. Megaloblastic anaemia due to vitamin B12 deficiency caused by small intestinal bacterial overgrowth: possible role of vitamin B12 analogues. British journal of haematology, 62(1), pp.7–12. Available at:

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