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Low FODMAP Diet for IBS: Pros and Cons

Irritable bowel syndrome (IBS) is a chronic gastrointestinal condition that can cause significant discomfort and distress. Characterised by abdominal pain, changes in stool consistency, and bowel movement irregularities, IBS poses a challenging clinical problem for healthcare providers and patients alike. However, recent research suggests that dietary modifications can play a crucial role in managing IBS symptoms. This article explores two dietary approaches—low FODMAP and IgG elimination-rotation diet—and their effectiveness in treating IBS.

Understanding IBS and the Importance of Diet

IBS is a multifaceted disorder that can be triggered by various factors, including diet. Up to 67% of IBS patients report experiencing symptoms after consuming certain foods. Many individuals with IBS find relief by eliminating specific food products from their diet. Among the dietary components that have been closely linked to IBS symptoms are FODMAP carbohydrates, which include fermentable oligosaccharides, disaccharides, monosaccharides, and polyols.

Low FODMAP Diet: Relief for IBS Symptoms

Studies have shown that a temporary low FODMAP diet can significantly alleviate the functional symptoms of gastrointestinal conditions compared to standard dietary recommendations. This diet focuses on reducing or eliminating FODMAP-rich foods that contribute to excessive gas production and osmotic effects, leading to discomfort and pain. However, even though the low FODMAP diet has demonstrated benefits, some patients continue to experience symptoms such as bloating.

IgG Elimination-Rotation Diet: A Personalised Approach

In recent years, researchers have explored the role of IgG-dependent food hypersensitivity in IBS. Elevated IgG food antibody concentrations in the blood have been associated with immune activation and delayed food hypersensitivity. The IgG elimination-rotation diet tailors the diet to each individual’s immune response, potentially offering more precise symptom relief. This diet involves eliminating IgG-positive foods from the diet while allowing IgG-negative foods on a rotation basis.

Comparing low FODMAP and IgG elimination diet for IBS: Research Findings

A study aimed to compare the effectiveness of three different diet plans—low FODMAP, IgG elimination-rotation, and a standard diet recommended by gastroenterologists—in treating patients diagnosed with IBS-M. IBS-M patients experience mixed bowel patterns, and 73 female patients were included in the study.

Low FODMAP Results

The introduction of the low-FODMAP diet led to improvement in over 76% of patients compared to the 54% following NICE recommendations. These improvements were predominantly seen in symptoms like abdominal pain, cramps, diarrhea, gas, and bloating. Despite this, about 30% of patients still experienced bloating on the FODMAP diet. A similar trend was observed in a new study, with significant reductions in bloating, gurgling sensation, and gastric fullness in the low FODMAP group.

IgG Elimination Diet Results

Unlike the low FODMAP diet, the IgG approach focuses on targeting foods that may trigger immune responses, potentially reducing inflammation and IBS symptoms. By removing foods that trigger an immune response and rotating others in the diet, this approach aims to provide relief from both gastrointestinal and extra-intestinal symptoms associated with IBS. Notably, the elimination-rotation group experienced a substantial decrease in bloating (90% to 9%), gurgling sensation (85% to 9%), and gastric fullness (90% to 9%). This personalised dietary approach takes into account individual immune responses to certain foods, which may offer more targeted relief compared to generalised diet recommendations.

The Potential of Personalised Diets

The study’s findings support the idea that a personalised dietary approach, such as the IgG elimination-rotation diet, may offer more effective relief from IBS symptoms compared to generalised diet recommendations. Additionally, this diet was associated with improvements in extra-intestinal symptoms like fatigue, headaches, and skin lesions. These results suggest a potential link between IBS and low-grade inflammation and highlight the importance of individualised dietary interventions.

Low FODMAP diet and the gut microbiome

While low FODMAP diets have gained popularity for providing short-term relief from Irritable Bowel Syndrome (IBS) symptoms, it’s important to consider potential long-term effects on the gut microbiome. Research suggests that extended adherence to low FODMAP diets may disrupt the balance of gut bacteria, particularly important butyrate-producing species like Faecalibacterium. Butyrate is a crucial substance that supports gut health and plays a role in maintaining a balanced microbiome. Prolonged restriction of FODMAP-rich foods can lead to reduced diversity and abundance of beneficial gut bacteria, which in turn might impact overall gut function and immune responses. Therefore, it’s recommended that low FODMAP diets be utilised as a temporary solution under the guidance of healthcare professionals, while incorporating strategies to support and restore a healthy gut microbiome in the long term.

On a low FODMAP diet, certain types of carbohydrates are restricted to alleviate symptoms of IBS. FODMAP stands for Fermentable Oligosaccharides, Disaccharides, Monosaccharides, and Polyols. Foods that are high in FODMAPs are often avoided as they can be poorly absorbed in the small intestine, leading to increased fermentation by gut bacteria, resulting in gas, bloating, and other digestive discomfort.

Examples of foods that are typically restricted on a low FODMAP diet include:

  1. Oligosaccharides: Foods containing fructans (e.g., wheat, onions, garlic) and galacto-oligosaccharides (e.g., legumes, beans).
  2. Disaccharides: Lactose-containing foods (e.g., dairy products like milk, yogurt, and some soft cheeses).
  3. Monosaccharides: Foods high in excess fructose (e.g., some fruits like apples, pears, honey, and high-fructose corn syrup).
  4. Polyols: Sugar alcohols found in some fruits (e.g., stone fruits like cherries, peaches), as well as certain artificial sweeteners (e.g., xylitol, mannitol, sorbitol).

While a low FODMAP diet can provide relief for IBS symptoms, some of the foods restricted on this diet also have prebiotic properties, which means they serve as nourishment for beneficial gut bacteria. For example, fructans and galacto-oligosaccharides (GOS) are types of dietary fibers that can promote the growth of beneficial bacteria like Bifidobacteria and Lactobacilli. These bacteria help maintain a healthy gut environment, support digestion, and contribute to overall gut health.

Balancing the benefits of symptom relief with the potential impact on the gut microbiome is a key consideration when following a low FODMAP diet. It’s advisable to work with a healthcare professional, such as a registered dietitian, to ensure that the diet is used as a short-term solution and that steps are taken to gradually reintroduce FODMAP-rich foods and support the restoration of a diverse and thriving gut microbiome over time.


IBS is a complex condition with various triggers, and finding the right treatment approach can be challenging. Both the low FODMAP diet and the IgG elimination-rotation diet have shown promise in alleviating IBS symptoms. This study highlights the effectiveness of personalised dietary approaches over generalised recommendations, with the IgG elimination-rotation diet showing significant improvement in all monitored IBS symptoms. IBS often accompanies extra-intestinal conditions like migraines, allergies, and behavioral disorders, indicating potential underlying connections. While the low FODMAP diet targets specific carbohydrates to reduce gas and discomfort, the IgG elimination-rotation diet offers a personalised approach based on individual immune responses. As research continues, personalised dietary interventions may play a pivotal role in effectively managing IBS and improving the quality of life for those affected by this condition.

However, it’s essential to consider the broader implications of these diets on the gut microbiome. Foods high in FODMAPs often possess prebiotic properties, providing nourishment to beneficial gut bacteria like Bifidobacteria and Lactobacilli. This nurturing environment supports digestion, overall gut health, and immune function. While the short-term benefits of a low FODMAP diet are evident, a well-rounded perspective emphasises that this approach should be viewed as a temporary solution. Healthcare professionals recommend guided reintroduction of FODMAP-rich foods and measures to encourage the restoration of a diverse and resilient gut microbiome over the long term, ensuring both symptom relief and ongoing gut health.

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