Medical Disclaimer: The information provided in this blog is for educational and informational purposes only and is not intended as medical advice. Irritable Bowel Syndrome (IBS) symptoms can mimic other serious medical conditions; therefore, it is essential to consult with a healthcare professional or a registered dietitian before starting a Low FODMAP diet. The most up-to-date and clinically accurate information, including specific serving sizes and laboratory-tested food ratings, can be found via the Monash University FODMAP Diet App.

 

High FODMAP Foods To Avoid For Better Digestive Health

Digestive discomfort can make even simple meals stressful. If you live with irritable bowel syndrome (IBS), you’ve likely heard of the FODMAP diet and how certain foods can trigger symptoms like bloating, pain, or irregular bowel movements. High FODMAP foods—those rich in certain fermentable carbohydrates—are the ones you need to avoid to help reduce these symptoms and support better digestion.

Understanding which foods fall into the high FODMAP category helps you make confident choices. Many common items such as some fruits, vegetables, dairy products, legumes, and wheat-based foods can set off discomfort, even in small amounts. Learning to spot these foods and replace them with suitable low FODMAP options can make a noticeable difference in how you feel day to day.

Working with a registered dietitian can make this process clearer and more personalised. The following sections will show which foods to avoid, practical IBS friendly food substitutions, and straightforward answers to the most common questions about following the FODMAP diet for IBS.

 

High FODMAP Foods To Avoid

Certain foods contain high levels of fermentable carbohydrates that can cause abdominal discomfort, bloating, and altered bowel habits if you have irritable bowel syndrome (IBS). Common culprits include members of the allium family, some grains and fruits, and foods rich in oligosaccharides or sugar alcohols. Recognising these foods and identifying suitable swaps can help you reduce symptoms.

Medical disclaimer: While the ‘alternatives’ provided here are safer, they are not a guarantee of symptom relief if serving sizes are ignored. FODMAP Stacking occurs when multiple low-FODMAP ingredients are combined, creating a high-FODMAP total load in the gut. To maintain the integrity of your IBS treatment plan, you must verify the specific weight limits for each ingredient using the Monash University FODMAP Diet App.

 

Onion

Onions are one of the highest FODMAP foods due to their fructans, a type of oligosaccharide that your small intestine struggles to absorb. When these molecules reach the large intestine, bacteria ferment them, producing gas and drawing water into the bowel. This process can trigger bloating, abdominal pain, and diarrhoea.

All types of onion—brown, white, red, and Spanish—contain high levels of fructans whether cooked or raw. Even small quantities can cause symptoms in sensitive people. The bulb portion is particularly concentrated, so removing cooked pieces does not reliably make a dish low FODMAP.

For flavour, use the green tops of spring onions or chives, which are low in fructans. Onion-infused oils are another safe alternative because the fructans are not soluble in fat, leaving the flavour intact without the problematic carbohydrates.

 

 

Garlic

Garlic is another significant source of fructans, making it one of the most common high FODMAP triggers. Like onions, its carbohydrates feed intestinal bacteria through fermentation, often resulting in excessive gas and cramping. Raw garlic typically causes stronger reactions than cooked forms because heat can slightly reduce fructan content, but it remains high overall.

Large amounts are often hidden in sauces, marinades, and processed meats such as sausages or deli products. Reading labels carefully can help you avoid unexpected exposure.

The Alternative

You can enjoy garlic flavour safely by using garlic-infused oils or removing whole garlic cloves after briefly cooking them in oil. If you prepare your own, ensure the oil is stored properly to prevent bacterial growth. Avoid powdered and dehydrated forms, as they concentrate the same fructans found in fresh garlic.

 

Wheat

Wheat is a primary dietary source of fructans and galacto-oligosaccharides (GOS). It appears in bread, pasta, cereals, and many baked products, making it a major contributor to total FODMAP intake. The problem lies not in gluten, but in the fermentable carbohydrates that coexist with gluten in wheat.

During digestion, these short-chain carbs behave like osmotic agents, pulling water into the intestines and increasing fermentation. This can worsen bloating and discomfort.

The Alternative

Low-FODMAP alternatives include spelt bread (sourdough-based), rice, corn, oats, and gluten-free products made without high FODMAP additives like inulin or maltitol. When choosing flours, check ingredient lists carefully, especially in processed items such as sauces, marinades, or desserts where wheat-derived thickeners can appear.

 

 

Apples

Apples are high FODMAP due to their combination of excess fructose and sorbitol. This makes them particularly difficult to absorb in the small intestine. When these sugars reach the large intestine, they are rapidly fermented by gut bacteria, which can lead to bloating, abdominal pain, and changes in bowel habits.

Both fresh apples and apple-based products such as juice, dried apple, and apple puree are high FODMAP. Cooking apples does not significantly reduce their FODMAP content, so baked goods and sauces containing apple can still trigger symptoms.

The Alternative

As a low FODMAP alternative, choose fruits such as kiwifruit, strawberries, oranges, or grapes. These fruits are better balanced in their sugar content and are generally easier to digest when eaten in appropriate portions.

Pears

Pears are another high FODMAP fruit due to their high levels of excess fructose and sorbitol. This combination makes pears one of the most common fruit triggers for people with IBS, even in small serves.

Fresh pears, canned pears, pear juice, and dried pears all contain high FODMAP levels. Because fructose and sorbitol are water soluble, cooking or stewing pears does not make them more suitable on a low FODMAP diet.

The Alternative

Low FODMAP fruit alternatives include firm bananas, blueberries, pineapple, and citrus fruits. Paying attention to portion size remains important, even with better tolerated options.

 

 

Mushrooms

Mushrooms are high FODMAP due to their mannitol content, a type of sugar alcohol. Mannitol is poorly absorbed in the gut and can draw water into the bowel, leading to diarrhoea, bloating, and abdominal discomfort.

Common varieties such as button mushrooms, portobello mushrooms, and Swiss brown mushrooms are all high in mannitol. Even modest amounts can trigger symptoms for sensitive individuals.

The Alternative

Low FODMAP vegetable substitutes include zucchini, eggplant, spinach, carrots, and capsicum. These vegetables can be used in similar dishes without contributing the same fermentable carbohydrate load.

Cauliflower

Cauliflower contains both mannitol and fructans, making it a high FODMAP vegetable. This combination increases the likelihood of fermentation in the large intestine, which may result in bloating, gas, and pain.

Cauliflower is often consumed in large serves or as a wheat substitute in foods such as cauliflower rice or pizza bases. These larger portions further increase FODMAP intake and symptom risk.

The Alternative

Lower FODMAP alternatives include broccoli heads in small serves, green beans, pumpkin, or rice and quinoa when replacing grains.

 

 

Milk

Regular cow’s milk is high FODMAP due to its lactose content. Lactose is a disaccharide that requires sufficient lactase enzyme for digestion. In people with lactose intolerance, lactose passes into the large intestine where it is fermented, causing bloating, cramping, and diarrhoea.

This applies to regular milk, flavoured milk, and products made with standard milk. Yoghurt and soft cheeses can also be problematic if they contain high lactose levels.

The Alternative

Lactose-free milk is a suitable low FODMAP alternative, as the lactose has already been broken down. Hard cheeses such as cheddar and parmesan, as well as calcium-fortified plant-based milks like almond or rice milk, are also generally well tolerated.

Lentils

Lentils are high FODMAP due to their galacto-oligosaccharide (GOS) content. GOS is poorly absorbed in the small intestine and readily fermented in the colon, often leading to gas and bloating.

Both dried and cooked lentils can cause symptoms, particularly in standard serving sizes. Lentils are also commonly found in soups, curries, and vegetarian products, where portions can be difficult to control.

The Alternative

Canned lentils may be tolerated in small amounts, as some GOS leaches into the canning liquid. Rinsing them thoroughly and keeping serves small can help reduce symptoms. Low FODMAP protein alternatives include firm tofu, tempeh, eggs, and plain meats.

 

 

Cashews

Cashews are high FODMAP because they contain both fructans and GOS. Unlike many other nuts, cashews can trigger symptoms even in small quantities.

Cashew butter, mixed nuts, and products containing cashew paste can also be problematic. These ingredients are often added to sauces, vegan cheeses, and snack foods, making them easy to consume unknowingly.

The Alternative

Low FODMAP nut alternatives include peanuts, macadamias, pecans, walnuts, and small serves of almond butter. Portion size remains important, as even low FODMAP nuts can become problematic when eaten in excess.

Honey

Honey is high FODMAP due to its excess fructose content. When fructose is present in higher amounts than glucose, absorption becomes inefficient, increasing the risk of digestive symptoms.

Honey is commonly used as a natural sweetener in drinks, baking, and health foods, which can make it a hidden FODMAP source. Even small amounts may be enough to trigger symptoms in some people.

The Alternative

Low FODMAP sweetener alternatives include maple syrup, rice malt syrup, and table sugar. These options provide sweetness without the same fructose imbalance.

 

 

Low FODMAP Alternatives

When following a low FODMAP diet, replacing high FODMAP foods with suitable IBS friendly alternatives helps you manage IBS symptoms without overly restricting variety. Focus on simple swaps that reduce fermentable carbohydrates while maintaining nutrients and flavour. 

Choose low FODMAP grains like rice, quinoa, and oats instead of wheat or rye. Gluten-free bread and pasta often work well within FODMAP limits. For dairy, select lactose-free milk, hard cheeses, or plant-based options such as almond milk.

Low FODMAP fruits include kiwifruit, strawberries, oranges, and grapes. Kiwifruit offers natural enzymes that may support digestion and provide vitamin C. Limit portion sizes of moderate-FODMAP fruits to avoid triggering symptoms.

Vegetable choices can include spinach, carrots, eggplant, and zucchini. Avoid onions and garlic, but you can use garlic-infused oil to add flavour without the FODMAP content.

Incorporate prebiotic fibre from low FODMAP sources like oats and firm bananas to help maintain healthy gut bacteria. Some people find adding probiotics through yoghurt made with lactose-free milk or supplements beneficial, though responses can vary.

It is important to note that portion sizes do play a role. For example, just because a food is low FODMAP, doesn’t mean that you can eat unlimited amounts of it. In fact, some alternatives require specific serving sizes to keep them safe to eat. For more information on portion sizes, please refer to the Monash University FODMAP Diet App or a medical professional.

Experimenting with these options lets you create balanced meals that support your digestive comfort and nutritional needs.

 

 

List of High FODMAP Foods & Their Low FODMAP Alternatives

Please Note: A ‘Low FODMAP’ alternative is only considered low in fermentable carbohydrates when consumed in a standard serving size. Many foods listed as "Low FODMAP" contain small amounts of FODMAPs that can "stack" or become high-level triggers if eaten in large quantities. To ensure success during the elimination phase, we recommend cross-referencing these alternatives with the Monash University FODMAP App for precise weight and portion limits.