
Mushrooms are often labelled as high-FODMAP foods, but not all mushrooms are off the table if you're on a low-FODMAP diet. FODMAP stands for Fermentable Oligo-, Di-, Mono-saccharides and Polyols, and some mushrooms are extremely high in FODMAPs, while others are not. Monash University in Australia is a top research centre for studying the FODMAP properties of foods, and according to their app, some mushrooms are still low-FODMAP choices even in multiple servings. For example, dried shiitake mushrooms are low FODMAP at a serving size of two mushrooms, while fresh shiitake mushrooms are high in polyol-mannitol and are considered high FODMAP. While maitake mushrooms have not been tested for FODMAPs yet, one brand of organic maitake mushrooms is believed to be low FODMAP at one serving because there are no moderate or high FODMAP ingredients listed on the label.
| Characteristics | Values |
|---|---|
| Are maitake mushrooms low FODMAP? | One source suggests that maitake mushrooms are low FODMAP as there are no moderate or high FODMAP ingredients listed on the label. However, another source states that maitake mushrooms have not been tested for FODMAPs yet, so it is unclear if they are high or low FODMAP. |
| FODMAP diet | A low FODMAP diet is often followed by people with IBS or a similar inflammatory digestive disease. |
| FODMAP foods | FODMAP stands for Fermentable Oligo-, Di-, Mono-saccharides and Polyols. |
| Mushrooms and FODMAP | While mushrooms are often labelled as high FODMAP, not all mushrooms are high FODMAP. Some mushrooms that are low FODMAP include oyster mushrooms, canned champignon mushrooms, dried porcini mushrooms, and dried shiitake mushrooms. |
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What You'll Learn

Maitake mushrooms are believed to be low FODMAP
While some mushrooms are extremely high in FODMAPs, not all mushrooms are off the table if you are on a low-FODMAP diet. FODMAP stands for Fermentable Oligo-, Di-, Mono-saccharides and Polyols.
It is always a good idea to check the Monash University FODMAP app to see which varieties of certain foods are low or high in FODMAPs. Monash University in Australia is one of the top research centers studying the FODMAP properties of foods.
If you are on a low-FODMAP diet, it is important to be mindful of serving sizes, as certain low-FODMAP mushrooms become high FODMAP in larger serving sizes. For example, dried shiitake mushrooms are low FODMAP at a serving size of two mushrooms, but above this, they are high in the FODMAP mannitol. Similarly, dried porcini mushrooms are low FODMAP at a serving size of 1 tablespoon, but above this serving size, they are high in the FODMAP mannitol.
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FODMAP stands for Fermentable Oligo-, Di-, Mono-saccharides and Polyols
FODMAP is an acronym that stands for Fermentable Oligo-, Di-, Mono-saccharides and Polyols. These are short-chain carbohydrates that resist digestion and are poorly absorbed in the small intestine. Instead, they reach the colon, where they are fermented by gut bacteria, producing gas and chemicals. This process can cause abdominal bloating, distension, cramping, pain, and changes in bowel habits, particularly in people with IBS or other functional gastrointestinal disorders.
A low-FODMAP diet is often recommended for managing IBS and reducing digestive symptoms such as bloating, flatulence, and stomach pain. It involves eliminating FODMAPs from the diet and then gradually reintroducing them to determine personal tolerance levels and food sensitivities. While it can lead to significant improvements in digestive health, it may not be suitable for everyone and should be undertaken with caution.
Mushrooms are often labelled as high-FODMAP foods, but this classification is problematic as different varieties of mushrooms have varying FODMAP levels. For example, shiitake mushrooms are high in polyol-mannitol and are considered high-FODMAP, whereas oyster mushrooms are low-FODMAP.
As for maitake mushrooms specifically, there seems to be a lack of clear information on their FODMAP content. One source mentions them as untested for FODMAPs, suggesting that individuals will need to test their own tolerance levels. Therefore, while some mushrooms are high in FODMAPs, others are not, and it is important to consider the specific variety when following a low-FODMAP diet.
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Monash University is a top research centre for studying FODMAPs
Monash University in Melbourne, Australia, is one of the top research centres for studying FODMAP properties in foods. FODMAP stands for Fermentable Oligo-, Di-, Mono-saccharides and Polyols, which are short-chain carbohydrates that the small intestine cannot efficiently absorb.
The Low FODMAP Diet was first developed by researchers at Monash University to reduce the symptoms of IBS, which affects 15% of the world's population. The diet has been shown to improve the lives of people with IBS, and the university has continued to innovate in this area for over 10 years. Monash University offers a range of resources to support people with IBS, including a low FODMAP cookbook, online courses for dietitians and health professionals, and a Monash FODMAP app that provides information on the FODMAP content of different foods.
Monash University's research has found that not all mushrooms are high in FODMAPs, as was previously thought. For example, oyster mushrooms are low FODMAP, even in multiple servings. Canned champignon (button) mushrooms are also low FODMAP in half-cup servings, likely due to the leaching of mannitol and fructans into the brine. On the other hand, shiitake mushrooms are high in polyol-mannitol and should be avoided on a low FODMAP diet, although a half-serving of dried shiitake mushrooms tested as low FODMAP.
While Monash University is a leading research centre for FODMAPs, they have been criticised for charging for some of their resources, such as their app and online course. However, others argue that the fees are reasonable given the cost of research and the value provided, and that much of their information is also available for free online.
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Not all mushrooms are high FODMAP
It is a common misconception that all mushrooms are high in FODMAPs. FODMAP stands for Fermentable Oligo-, Di-, Mono-saccharides and Polyols, which are short-chain carbohydrates that the small intestine cannot efficiently absorb. Mushrooms come in various shapes, sizes, and varieties, and each type interacts with the digestive tract differently. While some mushrooms are indeed high in FODMAPs, others are not.
Oyster mushrooms, for instance, are considered a low-FODMAP food option. According to Monash University, a 1-cup serving of fresh oyster mushrooms is low in FODMAPs. King oyster mushrooms, a larger variety, can also be grilled and seasoned as a tasty, low-FODMAP option. Additionally, canned champignon (button) mushrooms are low FODMAP in half-cup servings. This is likely due to the mannitol and fructans leaching into the brine, reducing the overall FODMAP content.
Dried porcini mushrooms are another low-FODMAP option, but the serving size is crucial. A serving size of 1 tablespoon is recommended to keep it within the low-FODMAP range. Similarly, dried black chanterelle mushrooms are low FODMAP at a serving size of 1/8 cup. Exceeding these serving sizes can result in higher FODMAP levels, specifically in mannitol and sorbitol.
While fresh shiitake mushrooms are generally considered high in FODMAPs, dried shiitake mushrooms can be a low-FODMAP option when consumed in moderation. A serving size of 2 mushrooms is recommended to stay within the low-FODMAP threshold. However, it is important to note that individual tolerance levels may vary, and some people may need to avoid mushrooms altogether during the elimination phase of a low-FODMAP diet.
Regarding maitake mushrooms specifically, there is limited information available. One source suggests that a serving of organic maitake mushrooms is believed to be low FODMAP as there are no moderate or high FODMAP ingredients listed on the label. However, another source indicates that maitake mushrooms, along with several other types, have not been officially tested for FODMAP content yet. As a result, individuals may need to test their tolerance levels for these mushrooms.
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Serving size matters for FODMAP content
Serving size is an important consideration when it comes to FODMAP content. While some foods are inherently high or low FODMAP, the amount consumed can significantly impact their effect on individuals. Monash University, a leading research centre for FODMAP studies, has developed a system to classify foods as low, moderate, or high FODMAP based on typical serving sizes.
The Monash FODMAP Diet App uses a traffic light system, with green indicating low FODMAP, amber for moderate FODMAP, and red for high FODMAP levels. These ratings provide a quick guide for users to understand the FODMAP content of specific foods. However, it is important to note that these ratings are based on standard serving sizes, and the FODMAP content can vary depending on the quantity consumed.
For example, certain foods rated as high FODMAP in full servings may be low FODMAP in smaller portions. Avocado, zucchini, wheat pasta, sweet potato, chickpeas, and sweetcorn are examples of foods that can be enjoyed in moderation while on a low FODMAP diet. On the other hand, some low FODMAP foods can become high FODMAP when consumed in larger quantities. Therefore, it is crucial to pay attention to serving sizes and monitor individual tolerance levels.
The app provides detailed information about serving sizes and specific FODMAP contents, allowing users to make informed decisions about their diet. It is also important to leave adequate time between servings to prevent FODMAP overload. While three hours is generally recommended, individuals can adjust this timing based on their tolerance and symptoms.
In summary, serving size plays a crucial role in managing FODMAP content in one's diet. By understanding the FODMAP ratings and serving size guidelines, individuals can make informed choices about the types and quantities of foods they consume, ultimately helping to manage their FODMAP intake effectively.
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Frequently asked questions
It is believed that maitake mushrooms are low FODMAP at 1 serving as there are no moderate or high FODMAP ingredients listed on the label. However, it is worth noting that maitake mushrooms have not been tested for FODMAPs yet, so you will need to test your own tolerance level.
FODMAP stands for Fermentable Oligo-, Di-, Mono-saccharides and Polyols. It applies to any short-chain carbohydrate that your small intestine can’t absorb efficiently.
Foods that are high in FODMAPs include mushrooms such as shiitake, portobello, enoki, and fresh button mushrooms.
Mushrooms that are low FODMAP include oyster mushrooms, king oyster mushrooms, canned champignon mushrooms, dried porcini mushrooms, and dried black chanterelle mushrooms.

























