
The FODMAP diet is a 3-step process designed to help alleviate symptoms of irritable bowel syndrome (IBS). IBS is a common gut problem with symptoms including abdominal pain, bloating, wind, and changes in bowel habits. FODMAP stands for fermentable oligo-, di-, monosaccharides and polyols, which are short-chain carbohydrates that are resistant to digestion. These carbs are fermented by gut bacteria, producing gas and leading to digestive issues. The low FODMAP diet involves eliminating high-FODMAP foods, such as certain fruits, vegetables, dairy, and grains, and then gradually reintroducing them to identify triggers and tolerance levels. It is meant to be a temporary diet, helping individuals manage their IBS symptoms and develop a sustainable, long-term diet plan.
| Characteristics | Values |
|---|---|
| Purpose | To help manage the symptoms of medically diagnosed irritable bowel syndrome (IBS) |
| Type of diet | Temporary elimination diet |
| Number of steps | 3 |
| Foods to eliminate | High-FODMAP foods, including certain fruits, vegetables, dairy products, grains, legumes, and processed meats |
| Foods to include | Low-FODMAP alternatives, such as plain-cooked meats, tofu, eggs, lactose-free dairy, hard cheeses, aged soft cheeses, peanuts, macadamia nuts, pine nuts, sesame seeds, water, coffee, tea |
| Duration of elimination phase | 2 to 6 weeks |
| Reintroduction phase | Gradually reintroduce high-FODMAP foods from each category, one at a time, to identify tolerance |
| Maintenance phase | Customized diet plan based on individual tolerance, including only the FODMAPs that are well-tolerated |
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What You'll Learn

FODMAP diet and IBS
FODMAP stands for fermentable oligo-, di-, monosaccharides and polyols. These are short-chain carbohydrates that are resistant to digestion and are, therefore, not absorbed into the bloodstream. Instead, they reach the end of the intestine, where they are fermented and used as fuel by gut bacteria. This process produces hydrogen gas and can cause digestive symptoms in sensitive individuals. FODMAPs also draw liquid into the intestine, which may cause diarrhoea.
A low FODMAP diet can help to reverse these symptoms and is often recommended for people with irritable bowel syndrome (IBS). IBS is a common gut problem with symptoms including abdominal pain, bloating, wind, and changes in bowel habits. The low FODMAP diet is a three-step process that helps to identify which foods trigger IBS symptoms and which reduce them. It is not a permanent solution, but rather a way to improve digestive comfort and overall health in the long term.
The first step of the FODMAP diet involves eliminating high FODMAP foods, such as certain fruits, vegetables, dairy products, and grains, and replacing them with low FODMAP alternatives. This step usually lasts between two and six weeks. During this time, it is important to plan meals in advance and ensure that the pantry and fridge are stocked with low-FODMAP options.
In the second step, FODMAP 'challenges' are introduced. This involves eating a food rich in only one FODMAP group for three days and monitoring symptoms. This process is repeated with different FODMAP groups to identify which ones trigger symptoms. The third and final step involves creating a customised maintenance diet that includes only the FODMAP groups that are well-tolerated.
It is important to note that the low FODMAP diet is not meant to be followed permanently. It is a restrictive diet and can be challenging, so it is best undertaken with the guidance of a healthcare professional. Additionally, it is not suitable for those who are underweight, as it may lead to further weight loss.
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FODMAP acronym meaning
FODMAP is an acronym for a certain class of carbohydrates called fermentable short-chain carbohydrates, which are harder for people to digest. The full form of the acronym is Fermentable Oligosaccharides, Disaccharides, Monosaccharides and Polyols. These short-chain carbs are resistant to digestion. Instead of being absorbed into your bloodstream, they reach the far end of your intestine, where most of your gut bacteria reside. Your gut bacteria then use these carbs for fuel, producing hydrogen gas and causing digestive symptoms in sensitive individuals. FODMAPs also draw liquid into your intestine, which may cause diarrhoea.
The low-FODMAP diet is a temporary eating plan that is very restrictive. It is designed to help people with irritable bowel syndrome (IBS) and/or small intestinal bacterial overgrowth (SIBO) figure out which foods are problematic and which foods reduce symptoms. It is a 3-step diet used to help manage the symptoms of medically diagnosed IBS. The three phases of the diet are an elimination phase, a reintroduction phase, and a maintenance phase that is customised to the individual. During the elimination phase, you avoid all high-FODMAP foods, which include specific fruits, vegetables, dairy products, and grains. After two to four weeks, you begin the reintroduction phase, in which you systematically add foods back in. The third phase keeps the foods that work for you and leaves out the ones that don't.
The purpose of this diet is not to completely eliminate FODMAPs, which is extremely difficult, but simply to minimise them. There is a wide variety of healthy and nutritious foods that you can eat on a low-FODMAP diet.
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FODMAP diet benefits
FODMAP is an acronym for fermentable oligosaccharides, disaccharides, monosaccharides and polyols. These are short-chain carbohydrates that are resistant to digestion. Instead of being absorbed into the bloodstream, they reach the end of the intestine, where most of the gut bacteria reside. The bacteria then use these carbs for fuel, producing hydrogen gas and causing digestive symptoms in sensitive individuals. FODMAPs also draw liquid into the intestine, which may cause diarrhoea.
The FODMAP diet is a 3-step process to help manage the symptoms of irritable bowel syndrome (IBS) and small intestinal bacterial overgrowth (SIBO). It is a temporary, restrictive diet that aims to identify which foods are problematic and which reduce symptoms. It is not meant to be a permanent solution but rather a process to help understand which foods are triggering symptoms.
The low-FODMAP diet has three phases: elimination, reintroduction, and maintenance. During the elimination phase, all high-FODMAP foods are avoided. This includes specific fruits, vegetables, dairy products, and grains. After two to four weeks, the reintroduction phase begins, where high-FODMAP foods are systematically added back in. The third phase keeps the foods that work and leaves out the rest.
The low-FODMAP diet has been shown to benefit people with IBS and SIBO, with studies showing that a majority of people living with these conditions experience improved symptoms. It can also be used as a short-term elimination diet for anyone with digestive problems to identify food sensitivities. The diet may also cause positive psychological benefits, as digestive disturbances are linked to stress and mental disorders like anxiety and depression.
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FODMAP diet foods
The FODMAP diet is a 3-step diet used to help manage the symptoms of medically diagnosed irritable bowel syndrome (IBS). It is a temporary dietary plan that involves limiting or avoiding foods high in FODMAPs. FODMAP stands for fermentable oligosaccharides, disaccharides, monosaccharides, and polyols. These are short-chain carbohydrates that are resistant to digestion and are instead fermented by gut bacteria, producing gas and fatty acids as byproducts.
The diet has three phases: elimination, reintroduction, and maintenance. During the elimination phase, high-FODMAP foods such as certain fruits, vegetables, dairy products, and grains are avoided. This phase typically lasts for two to six weeks. The reintroduction phase involves systematically adding high-FODMAP foods back into the diet, one at a time, to identify which specific FODMAPs trigger symptoms. The final maintenance phase involves creating a personalized diet plan that includes only the FODMAPs that are well-tolerated.
Low FODMAP foods that can be consumed more liberally include:
- Vegetables: Lettuces, carrots, chives, fennel, eggplant, broccoli, zucchini, green beans, and baby spinach
- Fruits: Strawberries, pineapple, grapes, oranges, cucumbers, and kiwifruit
- Proteins: Chicken, beef, turkey, cold cuts, lamb, tofu, and eggs
- Fish: Crab, lobster, salmon, tuna, and shrimp
- Fats: Oils, pumpkin seeds, butter, peanuts, macadamias, and walnuts
- Starches, cereals, and grains: Potatoes, amaranth, quinoa, brown rice, tortilla chips, and popcorn
High FODMAP foods to be avoided or minimized include:
- Vegetables: Garlic, asparagus, onions, mushrooms, beans, shallots, and scallions
- Fruits: Blackberries, watermelon, prunes, peaches, dates, and avocados
- Meats: Breaded meats, battered meats, and meats served with garlic or onion-based sauces and fillings
- Nuts: Pistachios, almonds, and cashews
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FODMAP diet phases
FODMAP stands for fermentable oligo-, di-, monosaccharides and polyols. These are short-chain carbohydrates that are resistant to digestion. Instead of being absorbed into the bloodstream, they reach the end of the intestine, where most of the gut bacteria reside. Gut bacteria use these carbs for fuel, producing hydrogen gas and causing digestive symptoms in sensitive individuals. FODMAPs also draw liquid into the intestine, which may cause diarrhoea.
The FODMAP diet is a 3-step diet used to help manage the symptoms of medically diagnosed irritable bowel syndrome (IBS). It is not meant to be a permanent solution but rather a tool to help figure out what foods are triggering IBS symptoms. It is recommended that each phase of the low FODMAP diet be undertaken with the guidance of a FODMAP-trained dietitian.
The three phases of the FODMAP diet are:
- Elimination phase: This phase involves avoiding all high-FODMAP foods, including specific fruits, vegetables, dairy products, and grains. It is recommended that this phase be followed for at least two weeks and no more than six weeks. During this time, you will use the Monash University FODMAP Diet App to choose foods with a ''green'' serving size, indicating a low FODMAP serve. It is important to note that this is not an elimination diet but rather a substitution diet, where you swap one food for another, such as switching an apple for an orange or an onion for chives.
- Reintroduction phase: This phase involves systematically reintroducing high-FODMAP foods back into your diet in a structured way to determine which FODMAPs trigger symptoms. This step should be completed under the guidance of a dietitian, who will advise on when to reintroduce, which foods to reintroduce, and the amount. Each FODMAP subgroup should be reintroduced separately while maintaining a low-FODMAP background diet. It is recommended to take a break of a few days between the reintroduction of foods to avoid any crossover effects. This phase typically lasts around six to eight weeks.
- Personalisation phase: The final phase involves establishing a long-term, personalised FODMAP diet based on the interpretation of your food triggers and tolerances. Once you have identified the FODMAPs that trigger symptoms, you can begin to reintroduce the FODMAPs that were well tolerated and avoid only those that caused issues. This phase is about ensuring your diet is minimally restrictive while still providing adequate symptom control.
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Frequently asked questions
FODMAP stands for fermentable oligosaccharides, disaccharides, monosaccharides and polyols. These are short-chain carbohydrates that the small intestine absorbs poorly.
The FODMAP diet is a temporary dietary plan that involves limiting or avoiding foods high in FODMAPs. It is not a long-term diet plan but a way to identify and substitute specific foods that may worsen symptoms.
The FODMAP diet has three phases: an elimination phase, a reintroduction phase, and a maintenance phase. During the elimination phase, you avoid all high-FODMAP foods. After two to six weeks, you begin the reintroduction phase, in which you systematically add high-FODMAP foods back in one at a time to see which ones are problematic. The third phase keeps the foods that work for you and leaves out the ones that don't.
The FODMAP diet is designed to help people with irritable bowel syndrome (IBS) and/or small intestinal bacterial overgrowth (SIBO) figure out which foods are problematic and which foods reduce symptoms. It may also benefit people with other inflammatory digestive conditions.
High FODMAP foods include fruits, vegetables, grains, and proteins that are rich in FODMAPs, such as onions, garlic, blackberries, avocados, breaded meats or fish, almonds, and wheat or gluten-based bread. Low FODMAP foods include chicken, turkey, tofu, salmon, carrot, broccoli, strawberries, oranges, pumpkin seeds, potatoes, and brown rice.







































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