Irritable Bowel Syndrome: Which Foods Really Help?

Before talking about diet, it is important to define the condition precisely, because confusion between IBS, food intolerance, dysbiosis and a "sensitive stomach" can lead to inappropriate decisions.

Irritable bowel syndrome (IBS), sometimes referred to as functional bowel disorder, combines recurrent abdominal pain, bloating and changes in bowel habits, diarrhoea (IBS-D), constipation (IBS-C), or alternating between the two (IBS-M), without any identifiable structural abnormality on examination. Diagnosis is based on the international Rome IV criteria: recurrent symptoms for at least six months, with a clear relationship between pain and bowel movements or changes in bowel habits. It is a functional disorder: real and potentially debilitating, but without structural abnormalities, which does not make the symptoms any less significant¹.

IBS affects approximately 5 to 10% of the adult population in France, with women accounting for around two-thirds of cases. It is one of the most common reasons for consulting a gastroenterologist, and probably one of the most underdiagnosed digestive disorders. Many people live with these symptoms for years without knowing that there is a name for them. The diagnostic process often remains lengthy, with an average delay of several years between the first symptoms and diagnosis⁵.

Despite the strong focus on diet, IBS is not simply a reaction to what we eat. Several mechanisms interact: visceral hypersensitivity (the digestive tract perceives as painful sensations that would go unnoticed in others), altered intestinal motility, gut microbiome dysbiosis, disruption of the gut-brain axis, and often a history of gastrointestinal infection (post-infectious IBS). The gut microbiome is a central player in these functional disorders, and modulating it is now considered a therapeutic avenue in its own right⁶. Understanding this multifactorial nature is already a way to move beyond the idea that "it's all about what's on your plate."

The idea that a simple dietary adjustment could solve everything is as appealing as it is inaccurate. The scientific literature is more nuanced, and one strategy has emerged with stronger evidence than the others.

FODMAP stands for fermentable carbohydrates (Fermentable Oligo-, Di-, Mono-saccharides And Polyols) that are poorly absorbed in the small intestine and reach the colon, where they are rapidly fermented by the microbiome, producing gas, distension and pain in sensitive individuals. They are found in onions, garlic, unsoaked legumes, apples, honey, certain dairy products and polyol sweeteners such as sorbitol and mannitol.

A low-FODMAP diet significantly reduces symptoms in around 70% of people with IBS, with measurable improvements in pain and bloating⁴. No other dietary intervention has reached the same level of evidence.

Removing gluten alone, without having coeliac disease, improves symptoms in some people, but this is mainly because it also reduces wheat fructans, a major FODMAP. Removing lactose alone can help people who are lactose intolerant, but this represents only a fraction of IBS cases. Eliminating a long list of foods "just in case" can impoverish the microbiome and often make the situation worse in the long term. Food restriction should remain targeted, temporary and followed by a structured reintroduction phase³.

The low-FODMAP diet is effective, but it is also restrictive and complex. When followed without professional guidance, it can lead to nutritional deficiencies (fibre, calcium, B vitamins), worsen dysbiosis (FODMAPs also feed beneficial bacteria) and create an unhealthy cycle of increasing food restriction.

The diet should therefore be followed under the supervision of a trained dietitian, with the strict elimination phase limited to 4 to 8 weeks and followed by a mandatory reintroduction phase⁸. It is not a lifestyle, it is a temporary tool for investigation and symptom relief.

Outside the elimination phase of a FODMAP protocol, several food groups are generally well tolerated and can help with IBS symptoms.

Unlike insoluble fibre, which can worsen bloating and pain in IBS, soluble fibre is generally well tolerated and can provide clear benefits. Blond psyllium (ispaghula) is particularly well documented: its viscous gel helps regulate bowel movements, making it useful for both IBS-C and IBS-D, and it ferments gently without causing a sudden production of gas. It is available as a powder and can be taken at a dose of one to two teaspoons per day with a large glass of water. Oats, ripe bananas, cooked carrots and kiwi complete the range of generally well-tolerated sources of soluble fibre.

Fermented foods, yoghurt, kefir, kombucha, raw sauerkraut and probiotic shots, provide live strains that support the microbiome. Regular use of targeted probiotics can improve overall IBS symptoms, particularly pain and bloating, with a good tolerance profile⁷.

The rule: introduce one fermented food at a time, in small amounts, and observe how your body responds. Highly carbonated kombucha or very acidic sauerkraut may cause temporary discomfort in some hypersensitive individuals, in which case gentler options (yoghurt, diluted kefir, probiotic shots) may be preferable.

People with IBS often report better tolerance of cooked foods compared with the same foods eaten raw. A cooked carrot, steamed courgette or rehydrated prune is often much easier to digest than its raw equivalent, whose fibres can irritate a sensitive digestive tract. Gentle cooking methods (steaming, slow cooking, cooking en papillote) preserve nutrients while softening the fibrous structure. Warm preparations (soups, purées, porridge) can soothe the digestive tract, as warmth relaxes smooth muscles and reduces spasms.

Fennel, green anise, peppermint, chamomile and ginger have carminative properties: they help expel gas and relax the smooth muscle fibres of the digestive tract. Enteric-coated peppermint oil capsules are even among the best-documented natural treatments for IBS, with efficacy comparable to certain antispasmodics in several clinical trials. Two to three cups of herbal infusion per day, between meals, can provide real comfort without notable adverse effects.

Identifying what triggers symptoms is just as useful as identifying what relieves them. Sensitivity varies considerably from one person to another, but certain triggers appear repeatedly in patients' food diaries².

Unsurprisingly, the main culprits are FODMAPs. In practice: raw onions and garlic (often the number one triggers), unsoaked legumes, apples, pears, honey, certain sweeteners (sorbitol, mannitol and xylitol found in chewing gum), and some dairy products high in lactose.

Quantity matters just as much as the type of food: a small amount of cooked garlic is often tolerated, while a large bowl of onion soup will almost always trigger symptoms. A supervised FODMAP approach is specifically designed to identify individual tolerance thresholds.

Ultra-processed industrial foods (NOVA 4 classification) regularly contain emulsifiers (polysorbate 80, carboxymethylcellulose), intense sweeteners, modified starches and additives whose disruptive effects on the intestinal barrier and microbiome have been documented in several studies. In people with IBS, who are by definition hypersensitive, these products are frequently triggers, regardless of their FODMAP content. Reducing ultra-processed foods is probably one of the most universally beneficial adjustments for IBS, even before starting a FODMAP approach.

Coffee stimulates colonic motility, which can be useful in IBS-C but often problematic in IBS-D. Alcohol irritates the intestinal lining and disrupts the microbiome. Fried foods and cooked fats slow gastric emptying and intensify discomfort. Very large meals distend the digestive tract and amplify visceral hypersensitivity. These are common triggers and should be adjusted individually rather than necessarily eliminated altogether⁹.

The low-FODMAP diet is not a diet in the usual sense of the word: it is a three-phase investigation method, with each phase serving a specific purpose. Following it without professional guidance creates the risk of getting stuck in the elimination phase, the most restrictive one.

For 4 to 6 weeks, all foods high in FODMAPs are removed from the diet. This phase makes it possible to observe whether symptoms improve, and therefore whether FODMAPs are a significant factor for the individual concerned. Around 70% of people respond favourably; the others do not, in which case continuing would be unnecessary. This phase is difficult to manage alone because FODMAPs are present in a very large number of everyday foods, while maintaining a nutritionally balanced diet remains essential.

This is the most important phase, and probably the one most often overlooked. Once an improvement has been confirmed, FODMAPs are reintroduced one by one, by family (fructans, lactose, fructose, polyols, galacto-oligosaccharides), while observing individual tolerance thresholds. This phase generally lasts six to eight weeks.

The objective is to identify precisely which FODMAPs, and at what dose, can be consumed without triggering symptoms. Skipping this phase can lead to unnecessarily broad food restriction and long-term impoverishment of the microbiome.

After reintroduction, each person arrives at their own tolerance profile, sometimes broad, sometimes more limited. Phase 3 consists of building an everyday diet that excludes only the FODMAPs identified as problematic while reintroducing all the others. This is the phase that makes it possible to move away from restriction and regain both a social life and enjoyment of food. Adjustments are often needed over time, particularly after periods of stress or gastrointestinal infections that may alter sensitivity.

Focusing solely on diet means overlooking an important part of how IBS works. Three additional factors come into play, sometimes with a greater impact than diet itself.

Dysbiosis is a recurring feature of IBS, with reduced microbial diversity and an overgrowth of certain gas-producing strains. Current research is seeking to better characterise the microbial signatures associated with functional gastrointestinal disorders¹⁰.

Restoring this foundation relies on the synergy between tolerated prebiotic fibres (oats, ripe bananas, kiwi, psyllium), polyphenols (berries, green tea, cacao, olive oil) and live cultures introduced progressively. This process takes place over three to six months, not three weeks.

IBS is probably one of the digestive disorders most closely linked to psychological state. Chronic stress amplifies visceral hypersensitivity, meaning that it makes sensations that would normally be tolerated feel painful. Heart coherence exercises practised for five minutes twice a day, meditation, medical hypnotherapy, whose effectiveness in IBS has been validated in several clinical studies, and cognitive behavioural therapy are all tools that act on the gut-brain axis. This is not about reducing physical suffering to a psychological issue, it is about recognising a documented bidirectional physiological mechanism.

Keeping regular meal times, allowing a nightly fasting window of at least 12 hours, sleeping seven to nine hours per night and moving for thirty minutes a day (walking, cycling, swimming) are three factors with a consistent impact on IBS. A regular routine stabilises intestinal motility; sleep reduces systemic inflammation; moderate physical activity improves bowel movements and reduces stress. No dietary strategy can compensate for a disrupted lifestyle, it is an uncomfortable but essential truth.

Minimiil is a 60-millilitre fermented plant-based shot, with four active probiotic strains (Lactobacillus plantarum, L. rhamnosus, Streptococcus thermophilus, L. delbrueckii) combined with 2.1 grams of prebiotic fibre (agave inulin), in a fermented organic almond milk base. Organic, Nutri-Score A, with no added sugar.

For people with IBS, Minimiil should be introduced with the same care as any fermented food: start with half a shot per day, observe how your body responds, then gradually increase the amount. Agave inulin is a fructan, and therefore a FODMAP, which means it may be poorly tolerated during the strict elimination phase. During the personalisation phase, however, it is often well tolerated in small amounts and can then provide valuable support for the microbiome. As always with IBS, personalisation takes priority over general rules. If in doubt, a specialised dietitian can help determine where Minimiil fits within an overall protocol.

References

¹ Ameli
² APSSII
³ Dumas / CNRS
⁴ PMC
⁵ Dumas / CNRS
⁶ Inserm
⁷ Cochrane
⁸ WGO
⁹ PubMed
¹⁰ INRAE

This article is intended for informational and educational purposes. It is not a substitute for medical consultation or dietary care. The diagnosis of irritable bowel syndrome and the implementation of a FODMAP diet should be managed by a trained healthcare professional. Self-diagnosis and self-treatment are strongly discouraged.