digestive health clinic diet nutrition dietician nutritionist healthy gut irritable bowel syndrome IBS symptoms causes relief cork ireland
A 3-step Process

What is FODMAP?

July 20, 2023

Today, we're delving into the world of FODMAPs, a subject that has been widely discussed in recent years. If you’re someone who has struggled with digestive health issues in the past and have endeavoured down a self-diagnosis path online, FODMAP is likely a term you have heard before. However, understanding what the term actually means and how this understanding can get you on the path to a healthy gut is not always easy. Join me, Aoife McDonald, qualified dietitian and gut health/IBS specialist, as we unravel the mysteries of FODMAPs, understand the three-step process of the FODMAP diet, and discover how you can utilise a FODMAP diet to get your gut-health back on track. 

So, let's get started on our journey to digestive wellness!

What is FODMAP and Low FODMAP?

FODMAPs are certain types of carbohydrates that some individuals find difficult to digest, leading to digestive discomfort and symptoms of irritable bowel syndrome (IBS). The acronym stands for Fermentable Oligosaccharides, Disaccharides, Monosaccharides, and Polyols. These are all short-chain carbohydrates that the human gut often struggles to digest properly. 

Many people suffer from digestive health issues relating to the consumption of High FODMAP foods with symptoms often including bloating, cramping, diarrhoea, gassiness and constipation.               

The low FODMAP diet, an evidence-based approach, is designed to manage digestive symptoms, particularly for those with IBS. The low FODMAP diet involves removing or reducing high FODMAP foods from your diet for a period of time. There are many foods and food groups which can be classified as high FODMAP so complete removal or avoidance can be difficult. Below are a few high FODMAP foods most people would consume on a regular basis: 

  • Cereals, breads and other wheat-based products
  • Milk, cheese, yogurt and other dairy products
  • Lentils, beans, chickpeas and other legumes
  • Some fruits and vegetables such as apples, apricots, mangos, garlic and onions.

The FODMAP Diet: A 3-Step Process

The FODMAP diet involves three important steps that are crucial to understand. However, it's important to remember that this dietary approach is not intended to be a long-term solution.

Step 1: The Low FODMAP Phase

During this phase, you will follow a low FODMAP diet for a period of 2 to 6 weeks. The purpose of this phase is to minimise the intake of high FODMAP foods.. By reducing your FODMAP intake, you give your gut a chance to settle and your symptoms a chance to improve. However, it's essential to seek guidance from a registered dietitian and expert IBS and digestive health to ensure you're following the diet correctly.

Step 2: FODMAP Food Reintroduction

After completing the low FODMAP phase, it's time for the reintroduction stage. This step is crucial in identifying which specific FODMAP groups trigger your symptoms. By reintroducing one FODMAP group at a time, you can determine your personal tolerance levels and develop a more individualised approach to managing your gut health. It's highly recommended to work closely with a qualified dietitian during this phase to create a structured plan and receive expert guidance.

Step 3: Personalised FODMAP Approach

Once you've completed the reintroduction phase and identified the specific FODMAP groups that trigger your symptoms, it's time to develop a personalised approach. This step involves tailoring your diet to your individual tolerance levels. While some individuals may need to continue limiting certain FODMAP groups, most find that they can tolerate moderate amounts of certain foods without triggering symptoms. By incorporating Step 3 into the FODMAP diet, you can create a sustainable approach that allows you to enjoy a wide range of foods while still prioritising your digestive well-being.

Working closely with a dietitian during this phase is essential. They can help you navigate the complexities of your unique dietary needs, ensuring you maintain a balanced and varied diet while managing your gut health effectively.

Remember, every individual is different, and what works for one person may not work for another. Here at the Digestive Health Clinic we have a wide range of programmes and services that incorporate the FODMAP 3-step process aimed at tackling IBS symptoms and improving your overall gut health. From our 1:1 consultations to our one-of-a-kind, tried and tested IBS Relief Programme, we will work with you at each stage of your journey to ensure you achieve the best possible result, fast.

The Importance of Bacteria Diversity and Prebiotic Foods

While the low FODMAP diet can provide relief in the short term, it's important to consider its potential impact on the diversity of your gut bacteria. High FODMAP foods, often prebiotic foods, play a significant role in nourishing the beneficial bacteria in your gut. These bacteria contribute to overall gut health and proper digestion.

To support a healthy gut, it is advisable to reintroduce prebiotic foods after completing the low FODMAP phase. Foods such as garlic, onions, legumes, and certain whole grains can be gradually reintroduced with the guidance of a dietitian. They can help you strike the right balance between managing symptoms and promoting the growth of beneficial gut bacteria.

Caution Against Long-Term Low FODMAP Diet

While the low FODMAP diet can be beneficial in managing digestive symptoms, it's essential to recognize that it's not meant to be followed indefinitely. Prolonged restriction of high FODMAP foods can lead to reduced microbiota diversity and potential negative effects on your gut health.

In fact, some individuals who have adhered to a low FODMAP diet for an extended period have experienced negative consequences. That's why it's crucial not to dive into a FODMAP diet without a precise plan and strategy in place.


FODMAPs can significantly impact digestive health, especially for those with IBS. Understanding the three-step process of the FODMAP diet – the low FODMAP phase, FODMAP food reintroduction, and the importance of bacteria diversity – is vital in managing symptoms effectively.

Remember, a low FODMAP diet should only be followed for a specific duration of 2 to 6 weeks. It is equally important to work with a registered dietitian or nutritionist to ensure a safe and personalised approach. So, if you're considering a low FODMAP diet or need guidance with managing your digestive health, don't hesitate to contact The Digestive Health Clinic for a consultation. Your gut health matters, and together, we can create a plan tailored to your unique needs and goals.

Stay tuned for more helpful tips and insights on achieving and maintaining a healthy gut. Take care and be kind to your gut!

Our insights

Over the years we have gained some experience. Every month we like to share them with you. Check in with our blog.

Sorry there are no blogs posted yet