Many people suffer from unpleasant digestive symptoms such as abdominal pain, bloating, flatulence or irregular bowel movements. These symptoms can often be signs of irritable bowel syndrome (IBS), which is a very common but difficult-to-treat condition. If you are struggling with similar problems and are looking for a solution to your symptoms, it is worth finding out about the FODMAP diet, which has already brought relief to many people.
The FODMAP diet is a specialised diet designed specifically to alleviate digestive symptoms, particularly those associated with IBS. Although the name may sound complicated, the principle behind it is simple: temporarily restricting the intake of certain types of carbohydrates which, in many people, ferment in the gut, thereby causing gas, bloating and pain.
In this article, we explain in detail exactly what FODMAP is, how the diet works, which foods you should avoid and which ones you can safely eat. We’ll guide you through the three main stages of the diet and offer practical advice on how to follow it successfully. Our aim is to provide clear and easy-to-understand information to help you decide whether this diet might be right for you. The Endomedix At our gastroenterology centres, we are committed to ensuring that our patients receive the most up-to-date and effective treatments, including professional dietary advice.
What is FODMAP?
FODMAP is an English portmanteau word that refers to a group of short-chain carbohydrates that are difficult to digest. These carbohydrates can cause digestive problems in many people.
The solution to the acronym is as follows:
F – Fermentable
O – Oligosaccharides
D – Disaccharides
M – Monosaccharides
with – and (And)
P – Polyols
These carbohydrates are absorbed only with difficulty, if at all, in the small intestine. When they reach the large bowel in their unaltered form, the gut bacteria begin to ferment them. This process involves the production of gas. Furthermore, these molecules are osmotically active, which means they draw water into the gut. The increased volume of water and gas stretches the intestinal wall, which can cause bloating, abdominal pain, cramps and changes in stool consistency (diarrhoea or constipation) in susceptible individuals.
The main groups of FODMAPs and their sources
To understand the diet, it is important to be familiar with the different FODMAP groups and their most common food sources.
Oligosaccharides (fructans and galacto-oligosaccharides):
Fructans: Wheat, rye, onions, garlic, leeks, artichokes, asparagus, beetroot. Breakfast cereals, pasta and bread are the most common sources of fructans.
Galacto-oligosaccharides (GOS): Pulses, such as lentils, chickpeas and various types of beans, as well as cashew nuts and pistachios.
Disaccharides (lactose):
Lactose (milk sugar): Milk and dairy products, such as yoghurt, cream, soft cheeses and ice cream.
Monosaccharides (Fructose):
Fructose (fruit sugar): Fruits in which the proportion of fructose is higher than that of glucose. Examples include apples, pears, mangoes, cherries and watermelons. Honey and high-fructose maize syrup also fall into this category.
Polyols (sugar alcohols):
Sorbitol, Mannitol, Xylitol, Maltitol: They occur naturally in certain fruits (e.g. apples, pears, apricots, nectarines, plums, cauliflower, mushrooms) and vegetables. They are often used as artificial sweeteners in sugar-free chewing gum, sweets and diet products.
It is important to note that not everyone is sensitive to all FODMAP groups, and individual tolerance levels may also vary. The Endomedix Their specialists help to identify which groups are causing the symptoms.
How does the FODMAP diet work?
The diet is not a lifelong restriction, but a three-stage diagnostic process aimed at identifying individual sensitivities and developing a personalised diet that can be maintained in the long term.
Stage 1: Elimination (Withdrawal)
This is the strictest phase of the diet, which usually lasts for 2–6 weeks. During this period, all foods high in FODMAPs must be eliminated from the diet. The aim is to allow the gut to settle down and for symptoms to be significantly reduced or to disappear completely.
During the elimination phase, you may only consume foods that are low in FODMAPs. It is important to adhere strictly to this phase, as even small amounts of high-FODMAP foods can trigger symptoms and disrupt the process. If symptoms improve during this phase, this confirms that the symptoms are likely caused by FODMAPs. If there is no improvement, then another cause must be sought for the symptoms, in which case the Endomedix Gastroenterologists can help.
Stage 2: Rollback (Testing)
Once the symptoms have subsided, the second phase can begin. The aim of this phase is to determine which FODMAP groups the individual is sensitive to and in what quantities. The various FODMAP groups must be reintroduced into the diet one by one, in a systematic manner.
The process works as follows:
Select a FODMAP group (e.g. lactose).
For three days, eat a specific food that is characteristic of that particular group, gradually increasing the portion size (e.g. Day 1: half a glass of milk, Day 2: one glass of milk, Day 3: one and a half glasses of milk).
Keep an eye on your symptoms and keep a food diary.
If you do not experience any symptoms, you are likely to tolerate that particular FODMAP group. If symptoms do occur, you have identified one of the problematic groups.
After each round of testing, take a break of at least 3 days and return to a strict, low-FODMAP diet to allow your gut to settle down again before testing the next group.
This stage can be lengthy (8–12 weeks), but it is essential for developing a personalised diet. It is important to choose foods for retesting that contain only one type of FODMAP (e.g. milk for testing lactose, honey for testing fructose).
Stage 3: Personalised diet
By the end of the testing phase, it becomes clear which FODMAPs cause symptoms and in what quantities. The aim of the third stage is to develop a varied and nutritious diet that can be sustained in the long term and takes individual tolerance into account.
At this stage, you can reintroduce into your diet the FODMAPs that you tolerate well, and you only need to avoid or limit those that cause symptoms. This allows for the widest possible range of foods, preventing unnecessary restrictions and nutrient deficiencies. Individual tolerance can change over time, so it is worth trying to reintroduce foods that previously caused problems in small quantities every few months.
What foods can we eat, and which ones should we avoid?
To follow the diet, it is essential to be familiar with the lists of foods high and low in FODMAPs.
High-FODMAP foods (to be avoided during the elimination phase):
Vegetables: Onions, garlic, leeks, artichokes, asparagus, beetroot, cauliflower, mushrooms, peas.
Fruits: Apples, pears, mangoes, cherries, watermelons, apricots, nectarines, plums, dried fruit.
Cereals: Wheat, rye, barley and products made from them (bread, pasta, baked goods).
Dairy products: Milk, yoghurt, cream, soft cheeses, ice cream.
They are thin: Beans, lentils, chickpeas.
Nuts and seeds: Cashew nuts, pistachios.
Sweeteners: Honey, high-fructose maize syrup, sorbitol, mannitol, xylitol.
Low-FODMAP foods (suitable for consumption):
Vegetables: Cucumber, carrot, tomato, pepper, lettuce, spinach, courgette, aubergine, potato, green beans.
Fruits: Bananas (unripe), oranges, mandarins, strawberries, blueberries, raspberries, kiwis, pineapples, grapes.
Cereals: Gluten-free grains, such as rice, oats (gluten-free), maize, quinoa and millet.
Dairy products: Lactose-free milk and dairy products, hard cheeses (e.g. Cheddar, Parmesan), Camembert, Brie.
Meat, fish, eggs: All meat, fish and eggs prepared in their natural form are low in FODMAPs.
Nuts and seeds: Peanuts, walnuts, almonds (small amounts), pumpkin seeds, sunflower seeds.
Sweeteners: Sugar, maple syrup, rice syrup.
Before starting a diet, it is strongly recommended that you consult a specialist, such as a dietitian or a gastroenterology centre, such as the Endomedix, consult a specialist. They can help you reach an accurate diagnosis, follow a diet correctly and prevent nutritional deficiencies.
Who is the FODMAP diet recommended for?
The FODMAP diet was developed primarily for patients suffering from irritable bowel syndrome (IBS). Numerous clinical trials have confirmed that it brings about a significant improvement in symptoms (abdominal pain, bloating, flatulence, diarrhoea, constipation) in around 75% of those with IBS.
It may also be effective for other digestive conditions, such as:
Functional digestive disorders.
Small Intestinal Bacterial Overgrowth (SIBO).
Inflammatory bowel diseases (IBD), such as Crohn’s disease or ulcerative colitis, to alleviate symptoms during the remission phase of the disease.
It is important to emphasise that the diet should only be started once medical investigations have ruled out any other serious underlying conditions (e.g. coeliac disease, inflammatory bowel disease, tumours) that may be causing the symptoms.
What should we bear in mind whilst on a diet?
The FODMAP diet is a complex and restrictive diet which can present challenges.
Hidden FODMAPs: Read food labels carefully! Many processed products contain hidden ingredients that are high in FODMAPs (e.g. onion or garlic powder, fructose, inulin).
Nutrient intake: Long-term, improper restriction can lead to nutrient deficiencies, particularly calcium and fibre deficiency. During the diet, care must be taken to ensure an adequate intake of fibre from low-FODMAP sources (e.g. oats, quinoa, vegetables).
Expert advice: Guidance from a dietitian or gastroenterologist is essential for the successful and safe implementation of the diet. The Endomedix Qualified specialists are on hand at its centres.
Towards a better quality of life
The FODMAP diet can be an effective tool for those suffering from digestive problems, particularly IBS. Although the initial elimination phase may seem strict, the aim of the diet is not long-term restriction, but rather to identify individual sensitivities and develop a varied diet that ensures symptom-free living. The process requires patience and mindfulness, but the reward can be improved well-being and a significant improvement in quality of life.
If you feel that the FODMAP diet might help you, take the first step! See your GP or a gastroenterologist for an accurate diagnosis and appropriate guidance. The Endomedix Our team of experts is on hand to guide you along this journey towards a healthier and more balanced life, offering personalised advice and support.
