Best Foods for IBS and Gut Health — What to Eat First and What to Add Back
Most IBS food lists either tell you what to cut out or hand you a long list of "superfoods" that would flare a sensitive gut within a day. This one works in two stages. Part 1 is 15 gentle, low-FODMAP foods that most people with IBS tolerate well, even during a bad patch. Part 2 is 15 foods that do more for your gut over the long term, but need to be built up slowly and in the right portions. At the end you will find simple meal ideas that put both lists to work.
The 30 Foods at a Glance
Portion guidance below is based on Monash University's low-FODMAP testing. Monash periodically re-tests foods, so check the Monash FODMAP app for the latest serve sizes.
| Part 1 — Start here (gentle, low-FODMAP) | Part 2 — Build up to these (over time) |
|---|---|
| 1. Oats | 16. Kefir |
| 2. Kiwifruit | 17. Sauerkraut and kimchi |
| 3. Blueberries and strawberries | 18. Traditional sourdough bread |
| 4. Eggs | 19. Edamame |
| 5. Salmon, mackerel and sardines | 20. Tinned lentils and chickpeas |
| 6. Turkey and chicken | 21. Garlic |
| 7. Hard cheese | 22. Onions and leeks |
| 8. Greek yogurt (strained or lactose-free) | 23. Avocado |
| 9. Rice | 24. Pomegranate |
| 10. Potatoes | 25. Apples |
| 11. Carrots | 26. Firm, slightly green bananas |
| 12. Spinach and rocket | 27. Beetroot |
| 13. Broccoli (heads) | 28. Cauliflower |
| 14. Chia seeds | 29. Broccoli sprouts |
| 15. Garlic-infused olive oil | 30. Cocoa and dark chocolate |
Part 1 — Start Here: 15 Gentle, Low-FODMAP Foods
These foods are low in FODMAPs at normal portions and are well tolerated by most people with IBS. They make a solid base to eat from while symptoms settle, during the elimination phase of the low-FODMAP diet, or any time your gut is having a bad week.
1. Oats
Oats are one of the best sources of soluble fibre, which forms a gel in the gut, softens stool in IBS-C and firms it in IBS-D. Their beta-glucan fibre also feeds bacteria that produce short-chain fatty acids, which help maintain the gut lining.
Low-FODMAP portion: about ½ cup of rolled oats (around 50g). Larger bowls add fructans and GOS, so if you like a big breakfast, split it in two.
2. Kiwifruit
Green kiwi is the standout fruit for IBS-C. In a 2021 US trial of people with IBS-C or chronic constipation, two green kiwifruit a day performed similarly to psyllium and prunes for increasing complete bowel movements, and improved stool consistency. Unlike prunes, which contain sorbitol, kiwi is low-FODMAP, which makes it a better fit for a sensitive gut. Kiwi also contains actinidin, an enzyme that helps break down protein.
Low-FODMAP portion: two small green kiwifruit.
3. Blueberries and Strawberries
Two of the most reliably low-FODMAP fruits, and both rich in polyphenols, plant compounds that reach the large intestine largely intact and interact with gut bacteria. They are an easy way to keep fruit in your diet when many other fruits are off the table.
Low-FODMAP portion: a generous handful of blueberries; about five medium strawberries.
4. Eggs
Eggs contain no FODMAPs at all and are one of the easiest proteins to digest. Boiled, poached or scrambled, they are a reliable meal base on days when very little else feels safe. The only caution is how they are cooked: fried in lots of fat, or with onion and garlic, they become a different meal.
Low-FODMAP portion: no limit from a FODMAP perspective.
5. Salmon, Mackerel and Sardines
Oily fish are FODMAP-free and among the richest food sources of omega-3 fats. They are a filling, nutrient-dense protein that rarely causes gut symptoms. Tinned sardines and mackerel are inexpensive and widely available in Irish supermarkets; choose ones in olive oil or spring water rather than flavoured sauces, which often contain onion or garlic.
Low-FODMAP portion: no limit from a FODMAP perspective.
6. Turkey and Chicken
Plain poultry contains no FODMAPs and is lower in fat than many red meats, which matters for people whose IBS is triggered by fatty meals. Turkey mince is a versatile base for low-FODMAP dinners. Watch processed versions (sausages, marinated or breaded products), which often contain onion, garlic or wheat.
Low-FODMAP portion: no limit from a FODMAP perspective.
7. Hard Cheese
Hard and aged cheeses such as cheddar, parmesan and Swiss are naturally very low in lactose, because most of it is drained off with the whey or broken down during ageing. That makes them suitable for most people with lactose sensitivity, unlike soft cheeses such as ricotta and cottage cheese.
Low-FODMAP portion: about 40g (two slices).
8. Greek Yogurt (Strained or Lactose-Free)
Straining removes much of the whey and lactose, and live cultures digest more of what remains. That makes plain Greek yogurt one of the better-tolerated dairy foods in IBS, and a source of live bacteria. Lactose-free versions are the safest choice during strict elimination. For a full breakdown of brands and types, see Greek yogurt for IBS.
Low-FODMAP portion: lactose-free yogurt has no practical limit; regular strained Greek yogurt is best kept to a modest portion.
9. Rice
White and brown rice are both low-FODMAP and among the gentlest starches for a sensitive gut. Cooked and cooled rice develops resistant starch, a type of fibre that feeds beneficial bacteria. Reheat leftovers until piping hot and do not keep cooked rice for more than a day.
Low-FODMAP portion: about 1 cup cooked.
10. Potatoes
Potatoes are FODMAP-free and a filling, inexpensive staple. Like rice, potatoes that are cooked and then cooled form resistant starch. Keep the skins for extra fibre if you tolerate them, but peel them if insoluble fibre tends to worsen your bloating.
Low-FODMAP portion: no limit from a FODMAP perspective.
11. Carrots
Carrots are low-FODMAP at generous portions and are a good source of soluble fibre. Cooked carrots are often better tolerated than raw during a flare. They are a reliable way to add colour and bulk to meals when onion-based dishes are off the menu.
Low-FODMAP portion: very generous; no practical limit for most people.
12. Spinach and Rocket
Both are low-FODMAP salad bases and a source of folate, magnesium and polyphenols. Baby spinach can be eaten raw or wilted into almost any hot dish. Rocket adds a peppery flavour that helps make up for the lack of onion and garlic.
Low-FODMAP portion: about 1½ cups of baby spinach; about 1 cup of rocket.
13. Broccoli (Heads)
Broccoli is one of the better-tolerated green vegetables in IBS, but only the florets. The heads are low-FODMAP at a normal serve, while the stalks are higher in fructose and only low-FODMAP in smaller amounts. Broccolini (tenderstem) is another good option.
Low-FODMAP portion: about ¾ cup of broccoli heads; keep stalks to a small portion.
14. Chia Seeds
Chia seeds are rich in soluble fibre and absorb many times their weight in water, which helps regulate stool consistency in both directions. Soak them in milk or yogurt rather than eating them dry, and drink plenty of water when you start using them.
Low-FODMAP portion: 2 tablespoons (about 24g).
15. Garlic-Infused Olive Oil
Garlic's FODMAPs (fructans) are water-soluble but not fat-soluble. That means oil infused with garlic carries the flavour without the fructans, as long as the garlic pieces are removed. It is the single most useful swap for anyone who misses garlic. For why garlic causes problems and how to make the oil safely, see garlic and IBS.
Low-FODMAP portion: no limit from a FODMAP perspective. Shop-bought versions are safer than homemade oil stored at room temperature.
Part 2 — Build Up to These: 15 Gut-Friendly Foods to Add Over Time
These foods offer more for long-term gut health, through live bacteria, fermentable fibres or polyphenols, but many are higher in FODMAPs or need careful portioning. The low-FODMAP research is clear that long-term restriction is not the goal: once symptoms are under control, reintroducing as many foods as you tolerate is better for both your diet and your gut bacteria.
16. Kefir
Kefir is a fermented milk drink that contains a wider range of bacteria and yeasts than most yogurts. Much of its lactose is broken down during fermentation, and a classic study found kefir improved lactose digestion and tolerance in adults with lactose malabsorption. Start with a few tablespoons and build up. The full evidence, including how much to drink, is in kefir and IBS.
17. Sauerkraut and Kimchi
Fermented vegetables are one of the most practical ways to add live bacteria to your diet. In a 2021 Stanford trial, ten weeks of a diet high in fermented foods increased gut microbiome diversity and lowered several markers of inflammation in healthy adults. White-cabbage sauerkraut is better tolerated than red; kimchi often contains garlic and onion, so treat it as a later test. Choose unpasteurised products from the chilled section — shelf-stable jars have usually been heat-treated, which kills the bacteria.
18. Traditional Sourdough Bread
Long fermentation breaks down much of the fructan content in wheat, which is why traditional slow-fermented sourdough is often tolerated by people who react to ordinary bread. The key word is traditional: many supermarket "sourdough" loaves use added yeast and a short rise, which leaves the fructans in. Spelt sourdough is another good option.
19. Edamame
Young green soya beans are the gentlest way to bring legumes back into your diet, and are low-FODMAP at a normal serve. They are a complete plant protein and a good source of fibre. Frozen edamame are widely available in Irish supermarkets and need only a few minutes' cooking.
20. Tinned Lentils and Chickpeas
Lentils and chickpeas are rich in fibre and protein but contain GOS, a FODMAP that commonly causes gas and bloating. Tinned versions are better tolerated than dried, because some of the GOS leaches out into the canning liquid. Drain and rinse them well and start with two to three tablespoons.
21. Garlic
Garlic is one of the most common IBS triggers, but it also contains prebiotic fibres and compounds with research behind them. Some people find small amounts of well-cooked garlic tolerable once their gut has settled. Our garlic and IBS guide covers how much is too much, and the garlic and onion deep-dive compares powder, raw, cooked and infused oil.
22. Onions and Leeks
Onions are among the highest-fructan foods in the diet and one of the last foods most people reintroduce. Start with the green parts of spring onions and leeks, which are low-FODMAP, before testing the white bulbs. If cooked onion causes problems but small amounts of leek do not, that is useful information.
23. Avocado
Avocado provides healthy fats and fibre, but it is high in sorbitol beyond a small portion. Around one-eighth of an avocado (about 30g) is low-FODMAP. Tolerance to larger portions varies a lot from person to person, so test it rather than assuming.
24. Pomegranate
Pomegranate is one of the richest food sources of polyphenols called ellagitannins, which have been linked in research to the growth of Akkermansia muciniphila, a gut bacterium associated with a healthy gut lining. The seeds are low-FODMAP only in small portions (around a quarter of a cup), so use them as a topping rather than a main fruit.
25. Apples
Apples contain pectin, a soluble fibre that feeds beneficial bacteria, but they are also high in fructose and sorbitol. They are a common trigger, especially raw. Cooked or stewed apple in small amounts is a sensible first test.
26. Firm, Slightly Green Bananas
Ripeness changes everything with bananas. Firm, just-ripe bananas are low-FODMAP and contain resistant starch, which feeds beneficial gut bacteria. As bananas ripen, that starch turns into sugar and the fructan content rises, so very ripe, spotty bananas are only low-FODMAP in small amounts.
27. Beetroot
Beetroot is rich in nitrates and pigments with antioxidant activity, but contains GOS and fructans. Only a couple of slices are low-FODMAP, so add it to salads in small amounts and build up if you tolerate it. Note that beetroot can turn urine and stools red — harmless, but worth knowing so it does not cause alarm.
28. Cauliflower
Cauliflower is on this list because it surprises so many people. It is high in mannitol, a polyol, and is only low-FODMAP in very small amounts. Cauliflower rice is widely recommended as a low-carb swap, so it is a common hidden trigger, particularly for people trying keto or low-carb eating. If you tolerate it after reintroduction, it is a good source of fibre and vitamin C.
29. Broccoli Sprouts
Broccoli sprouts are one of the richest food sources of sulforaphane. Early human research is promising: in a small Japanese study of 48 healthy adults with mild constipation symptoms, 20g of broccoli sprouts a day for four weeks improved constipation scores, while the same amount of alfalfa sprouts did not. Broccoli sprouts have not been formally FODMAP-tested, although related sprouts such as alfalfa and bean sprouts are low-FODMAP, and they are usually eaten in small amounts.
30. Cocoa and Dark Chocolate
Cocoa is rich in flavanols, polyphenols that interact with gut bacteria. Pure cocoa or cacao powder is low-FODMAP at a couple of heaped teaspoons, and a small square or two of dark chocolate is usually well tolerated. Milk chocolate contains more lactose and sugar, so dark is the better choice. Stirred into oats or yogurt, cocoa makes a gut-friendly breakfast feel like a treat.
Simple IBS Meal Ideas Using the List
The meals below are deliberately simple and repeatable. Eating a consistent base of foods you tolerate, at regular times, takes the guesswork out of IBS: if symptoms flare, the cause is usually whatever changed. Each meal includes a Part 1 version for strict days and suggestions for building it out with Part 2 foods.
Breakfast: Overnight Oat Bowl
Strict version: Oats soaked in lactose-free or almond milk with chia seeds and a spoon of cocoa powder, topped with blueberries, sliced kiwi and lactose-free yogurt.
Build-up version: Use strained Greek yogurt or kefir, and add a small scatter of pomegranate seeds. Make a large batch and keep half for later in the day.
Lunch: Egg Salad Bowl
Strict version: Rocket and spinach, two boiled eggs, cucumber, tomato and grated carrot, dressed with garlic-infused olive oil.
Build-up version: Add a few slices of beetroot, a small portion of avocado, homemade coleslaw (no onion) or a slice of traditional sourdough.
Dinner: Turkey and Pepper Pan
Strict version: Turkey mince cooked in garlic-infused oil with diced red peppers and tinned tomatoes, served with rice or potatoes and broccoli heads.
Build-up version: Add a handful of edamame or a couple of tablespoons of rinsed tinned lentils, and the green tops of spring onions.
Lighter Meal: Fish and Potatoes
Strict version: Baked salmon or grilled mackerel with boiled potatoes, carrots and wilted spinach.
Build-up version: Serve with a spoonful of sauerkraut on the side.
Evening: Yogurt Bowl
Strict version: The second half of the morning oat bowl, or lactose-free yogurt with strawberries and a square of dark chocolate.
Build-up version: Swap in strained Greek yogurt or kefir.
If you are considering a lower-carbohydrate approach, many of the Part 1 foods overlap with a ketogenic diet — see the ketogenic diet and IBS. For when and how often to eat, see fasting, meal timing and IBS.
Fibre and IBS — The Type Matters
The blanket advice to "eat more fibre" is not helpful in IBS. Soluble fibre (oats, psyllium husk, chia seeds, kiwi) tends to help across subtypes, while insoluble fibre (wheat bran, high-fibre cereals) can make bloating and pain worse. A meta-analysis of fibre trials in IBS found that psyllium improved symptoms while bran did not.
| Fibre type | What it does | Effect on IBS | Good sources |
|---|---|---|---|
| Soluble fibre | Dissolves in water; forms a gel; feeds beneficial gut bacteria | Generally helpful across IBS subtypes; supports stool consistency | Oats, psyllium husk, chia seeds, kiwi, carrots |
| Insoluble fibre | Does not dissolve; adds bulk; speeds transit | Can worsen bloating, pain and diarrhoea; not recommended as a first step | Wheat bran, high-fibre cereals, tough vegetable skins in large amounts |
Psyllium husk is the most studied fibre supplement for IBS. It is the active ingredient in Fybogel, available in Irish pharmacies. Introduce it gradually with plenty of water.
Foods and Drinks That Commonly Trigger IBS
Beyond high-FODMAP foods, several types of food and drink consistently worsen IBS symptoms. For a broader look at diet, stress, hormones and other factors, see IBS triggers.
| Trigger | Examples | Why it causes problems | Most affects |
|---|---|---|---|
| High-fat / fried foods | Takeaways, chips, cream sauces, fatty meats | Exaggerates the gastrocolic reflex | IBS-D urgency and cramping |
| Caffeine | Coffee (including decaf), strong tea, energy drinks | Directly stimulates colonic motility | IBS-D urgency |
| Alcohol | Beer (fructans and carbonation), wine, spirits | Affects gut lining, motility and the microbiome | All subtypes; often worst the next day |
| Spicy foods | Chilli, hot sauce, heavily spiced dishes | Capsaicin activates pain receptors in the gut lining | Abdominal pain, urgency |
| Sugar-free sweeteners | Sorbitol, mannitol, xylitol (sugar-free sweets, chewing gum) | Poorly absorbed; draw water into the bowel | Bloating, diarrhoea |
| Fizzy drinks | Sparkling water, soft drinks, beer | Add gas and increase distension | Bloating, pain, belching |
| Ultra-processed foods | Packaged snacks, fast food, ready meals with emulsifiers | Hidden FODMAPs; emulsifiers linked to gut lining disruption | Bloating, altered transit |
Eating Habits That Help
How you eat matters almost as much as what you eat:
| Habit | Why it helps |
|---|---|
| Regular meals at consistent times | Supports the gut's daily rhythm and reduces symptom swings — see meal timing and IBS |
| Eat slowly and chew well | Reduces swallowed air, a common contributor to bloating |
| Smaller portions | Reduces the gastrocolic reflex; useful for urgency after eating |
| Avoid eating when stressed | Stress amplifies gut responses to food via the gut-brain axis |
| Leave 2–3 hours between your last meal and bed | Reduces late-night symptoms |
Frequently Asked Questions
The safest starting point is a short list of low-FODMAP foods that most people with IBS tolerate well: oats, kiwi, blueberries and strawberries, eggs, oily fish, turkey and chicken, hard cheese, lactose-free or strained Greek yogurt, rice, potatoes, carrots, spinach, broccoli heads, chia seeds and garlic-infused olive oil. Once symptoms settle, the aim is to build back towards a wider diet that includes fermented foods, legumes and other gut-friendly foods in portions you tolerate.
Broccoli heads (the florets) are low-FODMAP at a standard serve of about three-quarters of a cup, and are one of the better-tolerated green vegetables in IBS. The stalks are higher in fructose and are only low-FODMAP in smaller amounts, so eat the florets and go easy on the stalks.
Cauliflower is high in mannitol, a polyol, and is only low-FODMAP in very small amounts. It is a common hidden trigger because cauliflower rice is widely recommended as a low-carb swap. If you are following a strict low-FODMAP diet, leave it out and test it during the reintroduction phase.
Common IBS triggers include high-FODMAP foods (onions, garlic, wheat in large amounts, apples, pears, stone fruit, cauliflower, lactose and most legumes), fatty and fried foods, caffeine, alcohol, spicy food, fizzy drinks, sugar-free sweeteners (sorbitol, mannitol, xylitol) and large meals. Triggers are highly individual. A structured elimination and reintroduction is more reliable than avoiding everything on a list.
It depends on the type. Soluble fibre (oats, psyllium husk, chia seeds, kiwi) is generally helpful across IBS subtypes. Insoluble fibre such as wheat bran can worsen bloating and pain and is not recommended as a first step. A meta-analysis of fibre trials found psyllium improved IBS symptoms while bran did not.
They may. A 2021 Stanford trial found that a diet high in fermented foods such as yogurt, kefir and fermented vegetables increased gut microbiome diversity and lowered markers of inflammation in healthy adults. Some fermented foods are also high in FODMAPs, so introduce them slowly and in small portions.
Coffee is one of the most commonly reported IBS triggers, particularly for IBS-D. It stimulates colonic motility, and even decaf contains compounds that promote bowel contractions. If urgency and diarrhoea are your main symptoms, a two-week trial without coffee is a worthwhile experiment.
For many people, yes. Alcohol affects gut motility, the gut lining and the microbiome. Beer is particularly problematic because it is carbonated and often high in fructans. Symptoms are often worst the day after drinking.
IBS.ie
Ireland's dedicated IBS information resource. We provide evidence-based, HSE and PubMed-referenced content on irritable bowel syndrome — covering symptoms, diet, gut health and management. All content is for general information only. Always consult your GP or a qualified specialist for personal medical advice.
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Sources & References
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