
Mushrooms are a fungus and a good source of dietary fibre, vitamins, and minerals. They are low in calories and fat, and contain a modest amount of protein. Although mushrooms do contain carbohydrates, the amount varies depending on the type of mushroom and how they are cooked. For example, a cup of raw oyster mushrooms has 3 grams of net carbs, whereas a cup of raw white button mushrooms has 1 gram. Mushrooms are considered keto-friendly and can be a part of a low-carb diet.
| Characteristics | Values |
|---|---|
| Carbohydrate content | Varies by species, but overall, mushrooms have whole carbs that come primarily through fiber. |
| Carbohydrate content in raw mushrooms | 1 cup of raw mushrooms contains 2.3g total carbs, 1g net carbs, 0.2g fat, 2.2g protein, and 15 calories. |
| Carbohydrate content in cooked mushrooms | 100g cooked mushrooms have a higher carb content than raw mushrooms, as they lose water during the cooking process. |
| Carbohydrate content in white mushrooms | 100-gram serving: 3.26 grams of carbs. |
| Carbohydrate content in portobello mushrooms | 100-gram serving: 3.87 grams of carbs. |
| Carbohydrate content in oyster mushrooms | 100-gram serving: 6.09 grams of carbs. 1 cup of raw oyster mushrooms: 28 calories, 0.4g fat, 2.8g protein, and 3g net carbs. |
| Carbohydrate content in shiitake mushrooms | 19-gram piece: 1.3 grams of total carbs. 0.5 cups cooked: 41 calories, 0.2g fat, 1.1g protein, 10.4g total carbs, and 8.2g net carbs. 100-gram serving: 6.79 grams of carbs. |
| Carbohydrate content in white button mushrooms | 1 cup: 3.1 grams of carbs. |
| Carbohydrate content in portabella mushrooms | 1 piece: 4.26 grams of total carbs, with 1.3 grams from fiber. |
| Carbohydrate content in lion's mane, chestnut, pioppino, and nameko mushrooms | N/A |
| Ketogenic diet-friendly | Yes, as they are low-carb, low-calorie, and high-fat. |
| Vitamin D content | Some mushrooms are rich sources of vitamin D, as they contain ergosterol, which gets converted into vitamin D when exposed to UV light. |
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What You'll Learn

Carb content varies by species
Mushrooms do contain carbohydrates, but the amount varies depending on the type of mushroom. For instance, a 100-gram serving of white mushrooms has 3.26 grams of carbs, while a 100-gram serving of portobello mushrooms has 3.87 grams. Oyster mushrooms and shiitake mushrooms have slightly more carbs; a 100-gram serving of oyster mushrooms has 6.09 grams of carbs, and the same serving of shiitake mushrooms has 6.79 grams. A single piece of portabella mushroom contains 4.26 grams of total carbs, while a single shiitake mushroom (weighing 19 grams) has 1.3 grams of total carbs.
White button mushrooms, which weigh 96 grams, contain 3.1 grams of carbohydrates. Oyster mushrooms have a higher carb content, with 9.52 grams of total carbs per piece, 3.6 grams of which come from fibre. Raw button mushrooms have a lower carb content, with 1 gramme of net carbs per cup.
Mushrooms are a rich source of dietary fibre, a form of carbohydrate. However, they are neither sugary nor starchy, so they do not negatively affect blood sugar or body weight like other high-carb foods. The carbohydrates in mushrooms could even improve metabolic health and help maintain a healthy body weight.
The keto diet, a popular low-carb, high-fat diet, includes mushrooms as they are not considered a starchy food and have a low-carb content.
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Carbohydrates in mushrooms are dietary fibre
Mushrooms do contain carbohydrates, but their carb content is minimal. The exact amount of carbs varies depending on the type of mushroom. For instance, a 100-gram serving of white mushrooms has 3.26 grams of carbs, while the same serving of portobello mushrooms has 3.87 grams. Oyster mushrooms and shiitake mushrooms have slightly more, with 6.09 grams and 6.79 grams of carbs per 100 grams, respectively. A cup of raw button mushrooms has 1 gram of net carbs.
Despite containing carbohydrates, mushrooms are not considered a starchy food and do not impact blood sugar or body weight like other high-carb foods. This is because the carbohydrates in mushrooms exist primarily as dietary fibre, a form of carbohydrate that includes complex carbohydrates known as starches. Starches provide a steadier release of energy compared to simple sugars, which are rapidly converted into energy.
The fibre content of mushrooms may contribute to their health benefits. For example, mushrooms are low in calories and fat, making them compatible with low-carb diets. They also contain various nutrients, including vitamins, minerals, and non-nutritive substances with potential antioxidant, anti-inflammatory, and anticancer effects.
Mushrooms are a rich source of dietary fibre, and those with higher amounts of fibre could be more beneficial. For instance, a single piece of oyster mushroom has 9.52 grams of total carbs, with 3.6 grams from fibre. Similarly, a portabella mushroom provides 1.3 grams of fibre out of a total of 4.26 grams of carbs. Shiitake mushrooms also contain fibre, with 1.3 grams of total carbs per 19-gram mushroom.
The inclusion of mushrooms in the diet can be beneficial for those following low-carb diets, such as the ketogenic or keto diet, as they provide a nutritious and low-calorie food option.
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Mushrooms are keto-friendly
Mushrooms are a great addition to a keto diet. While they do contain carbohydrates, their carb content is minimal, and they are not considered a starchy food. The amount of carbs in mushrooms varies depending on the type of mushroom and how they are prepared. For example, a cup of raw button mushrooms has 15 calories, 0.2 grams of fat, 2.2 grams of protein, and 1 gram of net carb. On the other hand, cooked shiitake mushrooms have a higher carb content, with 8.2 grams of net carbs per half a cup.
White mushrooms have the lowest carb count, but this does not necessarily mean they are the best choice for a keto diet. Most mushrooms' carbohydrates exist as healthy dietary fiber, so those containing larger amounts could be more beneficial. For instance, oyster mushrooms have a higher carb content than white mushrooms, but their fiber content is also higher.
Mushrooms are a rich source of dietary fiber, a form of carbohydrate that is not easily absorbed by the body and does not impact blood sugar or body weight. The carbohydrates in mushrooms could even improve metabolic health and help maintain an optimal body weight. They are also low in calories and fat, making them compatible with weight loss diets.
In addition to their low carb content, mushrooms offer several nutritional benefits. They are a good source of protein, vitamins, minerals, and other beneficial micronutrients. Research has also shown that mushrooms have therapeutic properties, including supporting immunity and improving gut health.
Overall, mushrooms are a keto-friendly food that can be enjoyed as part of a healthy and balanced diet. They are a nutritious and delicious addition to low-carb meals, providing various health benefits.
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Carb content is higher in cooked mushrooms
Mushrooms contain carbohydrates, but the amount varies depending on the type of mushroom and whether they are cooked or raw. Carbohydrates are organic molecules composed of carbon, hydrogen, and oxygen, which can be further classified as sugars, starches, or dietary fibres. While mushrooms are not sugary or starchy, they are a good source of dietary fibre.
White button mushrooms, for example, contain fewer carbs than other varieties. According to the USDA, a 100-gram serving of white mushrooms contains 3.26 grams of carbohydrates. In comparison, a 100-gram serving of portobello mushrooms contains 3.87 grams of carbs. Oyster and shiitake mushrooms have slightly higher carb levels, with 6.09 and 6.79 grams of carbs per 100-gram serving, respectively.
The cooking process affects the carb content of mushrooms. When mushrooms are cooked, their water content decreases, resulting in a higher concentration of carbs per gram. For instance, raw oyster mushrooms contain 3 grams of net carbs per cup, while cooked shiitake mushrooms have 8.2 grams of net carbs per half-cup. This increase in carb concentration is more noticeable in cooked mushrooms because they have a high water content, typically around 80-90%.
Despite containing carbohydrates, mushrooms are considered compatible with low-carb diets. The ketogenic diet, for instance, includes mushrooms as they are not a starchy food and have low overall carb content. Additionally, the carbohydrates in mushrooms are primarily in the form of fibre, which has health benefits. Mushrooms also offer nutritional advantages beyond their carb content, such as vitamins, minerals, and antioxidants.
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Mushrooms are low-calorie
The calorie content of mushrooms is also low. For instance, a 100-gram serving of white mushrooms contains only 22 calories. Even when cooked, the calorie content remains low. Half a cup of cooked shiitake mushrooms, for example, has only 41 calories.
The low-calorie content of mushrooms makes them a suitable addition to weight loss diets and low-calorie dietary patterns. Furthermore, the carbohydrates in mushrooms are primarily in the form of dietary fiber, which is a healthy type of carbohydrate. Mushrooms are also low in fat and a good source of essential vitamins, minerals, and other beneficial micronutrients.
The exact carbohydrate and calorie content of mushrooms can vary depending on the specific type of mushroom, as well as factors such as cooking methods and the mushroom's water content. However, overall, mushrooms are considered a low-calorie food option.
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Frequently asked questions
Yes, mushrooms contain carbohydrates. However, their carb content is minimal and comes primarily through fibre. The exact amount of carbs varies depending on the type of mushroom.
Yes, mushrooms are keto-friendly. They are low in calories and fat, and their calorie content is also low. Mushrooms are compatible with low-carb diets.
Mushrooms are a rich source of dietary fibre and contain unique carbohydrates that may contribute significantly to their health benefits. They are low in fat and calories while being packed with essential minerals and vitamins. Research has shown that mushrooms could have therapeutic properties, including supporting immunity and improving gut health.

























