
Mushrooms are a type of fungus that has been consumed and used as medicine for thousands of years. They are versatile and nutrient-dense, packing a variety of health benefits. They are low in calories, cholesterol, and sodium, and are a good source of vitamins, minerals, and antioxidants. Mushrooms are also one of the few food sources that contain vitamin D, which is important for bone health and immune function. With their umami flavour, mushrooms make an excellent meat substitute and can be added to a variety of dishes.
| Characteristics | Values |
|---|---|
| Calories | Low |
| Fat | Very low |
| Protein | 2.2 grams per cup |
| Carbohydrates | Modest amounts of fiber |
| Vitamins | B vitamins (thiamine, riboflavin, B6, B12, niacin, pantothenic acid), vitamin C, vitamin D |
| Minerals | Selenium, copper, potassium, phosphorus, iron, zinc |
| Antioxidants | Polysaccharides, indoles, polyphenols, carotenoids, glutathione, ergothioneine |
| Other | Beta-glucans, riboflavin |
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What You'll Learn
- Mushrooms are a good source of vitamins, minerals, and antioxidants
- They are low in calories and fat, and can help with weight management
- Mushrooms contain ergosterol, which can be converted to vitamin D with UV exposure
- They may help prevent various health conditions, including cancer and diabetes
- Mushrooms are a natural source of vitamin D, unlike most other produce

Mushrooms are a good source of vitamins, minerals, and antioxidants
Mushrooms contain a variety of B vitamins, including thiamine, riboflavin, B6, and B12. These vitamins help the body to derive energy from food and form red blood cells. They also play a role in maintaining brain health. Furthermore, mushrooms are the only vegan, non-fortified dietary source of vitamin D, which is important for bone and immune health. Mushrooms also contain vitamin B6, which helps the body form red blood cells, and selenium, which can help prevent cell damage.
In addition to vitamins, mushrooms provide minerals that may be difficult to obtain from a vegan diet. For example, cremini mushrooms are an excellent source of zinc, which is important for the immune system and for ensuring optimal growth in infants and children. Mushrooms are also a rich source of potassium, which can help to reduce blood pressure and lessen the negative impact of sodium on the body.
Mushrooms are also a good source of antioxidants, which may help to protect against serious health conditions such as Alzheimer's, heart disease, cancer, and diabetes. The antioxidant properties of mushrooms may also contribute to their anti-inflammatory effects, improving immune system efficiency and protecting against obesity-related hypertension. Choline, another antioxidant found in mushrooms, is important for muscle movement, learning, and memory, as well as maintaining cellular membrane structure and transmitting nerve impulses.
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They are low in calories and fat, and can help with weight management
Mushrooms are a great food to consume if you are looking to manage your weight. They are low in calories and fat, and contain modest amounts of fibre and various nutrients. They are also fat-free and cholesterol-free. A cup of mushrooms contains only 15 calories and 0.2 grams of fat.
Mushrooms are also a good source of protein, with 2.2 grams of protein per cup. They are packed with micronutrients, including copper, potassium, phosphorus, and iron. Copper assists in energy production and iron utilization. Potassium is important for maintaining fluid and electrolyte balance, and may help to lower blood pressure. Iron is a mineral needed to synthesize haemoglobin, DNA, amino acids, neurotransmitters, and certain hormones.
Mushrooms are also a good source of B vitamins, including riboflavin, niacin (vitamin B3), pantothenic acid (vitamin B5), thiamine, B6, and B12. B vitamins help to provide energy by breaking down proteins, fats, and carbohydrates. They also play an important role in the nervous system.
In addition to their nutritional benefits, mushrooms have been used as medicine for thousands of years. They contain various antioxidants, which may help to prevent several health conditions, such as cancer and diabetes, when consumed as part of a nutritionally balanced diet. They can also help boost cardiovascular health and lower blood pressure.
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Mushrooms contain ergosterol, which can be converted to vitamin D with UV exposure
Mushrooms are a type of fungus that contains a substance called ergosterol, similar in structure to cholesterol in animals. Ergosterol is a precursor of vitamin D2. When exposed to ultraviolet light, ergosterol in mushrooms can be converted to vitamin D2. This process can be enhanced by the presence of heat and UV-B exposure. The conversion of ergosterol to vitamin D2 has been observed in various mushroom types, including shiitake, oyster, Portabella, and Agaricus bisporus button mushrooms.
The amount of vitamin D in mushrooms depends on their exposure to UV light. Mushrooms grown in the dark, such as white button, shiitake, and oyster mushrooms, contain less vitamin D. In contrast, wild mushrooms like chanterelles and morels, which receive more sunlight exposure, can have significantly higher levels of vitamin D.
To increase the vitamin D content of cultivated mushrooms, some manufacturers expose them to UV light, either from natural sunlight or UV lamps. This process can increase the vitamin D content in button mushrooms by several times. Even after harvesting, mushrooms can continue to produce vitamin D when exposed to UV light.
The drying process of mushrooms also influences the conversion of ergosterol to vitamin D. Studies have shown that UV-treated dried mushrooms have higher vitamin D2 content than fresh mushrooms. Thermal drying in the presence of UV light has been found to be particularly effective in enhancing the nutritional content of mushrooms by converting ergosterol into vitamin D.
In summary, mushrooms contain ergosterol, which can be effectively converted to vitamin D2 through exposure to UV light. This process can be enhanced by various factors, including heat, UV-B exposure, and drying methods. By understanding and optimizing these conditions, the vitamin D content in mushrooms can be significantly increased, making them a valuable source of this essential nutrient.
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They may help prevent various health conditions, including cancer and diabetes
Mushrooms are rich in vitamins, nutrients, and antioxidants. They are also a source of ergothioneine, a potent antioxidant and cellular protector. The B vitamins and polysaccharides in mushrooms may aid in managing blood sugar levels and preventing diabetes and its complications. Mushrooms are low in calories, carbohydrates, and sugar, making them suitable for a diabetes-friendly diet. They are also a good source of selenium, which is linked to a reduced risk of cancer.
Research suggests that consuming mushrooms may lower the risk of certain cancers, including breast, prostate, and colorectal cancer. A study by Penn State College of Medicine found that individuals who regularly incorporated mushrooms into their diet had a significantly lower risk of cancer, with one study suggesting that eating 2 mushrooms a day can halve your risk of cancer. Another study, published in Advances in Nutrition, analyzed 17 cancer studies from 1966 to 2020 and found that individuals who consumed 18 grams of mushrooms daily had a 45% lower risk of cancer compared to non-mushroom eaters.
While the specific mechanisms are still being explored, the findings suggest that mushrooms may have protective effects against cancer. The World Cancer Research Fund emphasizes that while diet can impact cancer risk, more research is needed to confirm the specific impact of mushrooms.
In addition to their potential cancer-fighting properties, mushrooms are also touted for their brain health benefits. Lion's mane mushrooms, in particular, are known for their positive impact on brain health.
Overall, mushrooms are a nutritious food that may help prevent various health conditions, including cancer and diabetes. They are a good source of vitamins, minerals, and antioxidants, which contribute to their potential health benefits.
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Mushrooms are a natural source of vitamin D, unlike most other produce
Mushrooms are a type of fungus that contains a substance called ergosterol, which can be transformed into vitamin D2 when exposed to ultraviolet light. This is a unique feature among produce, as most other fruits and vegetables do not naturally contain vitamin D.
The amount of vitamin D in mushrooms varies depending on their exposure to UV light. Wild mushrooms, such as chanterelles and morels, can contain up to 1200 IU of vitamin D per 3.5-ounce serving due to their exposure to natural sunlight. In contrast, mushrooms grown in darkened conditions, such as white button, shiitake, and oyster mushrooms, contain less than 40 IU. However, even button mushrooms exposed to sunlight or UV lamps can produce up to 400 IU of vitamin D per 3.5-ounce serving. Dried mushrooms are also a good source of vitamin D2, retaining about 600 IU per 3.5 ounces when stored in cool, dark, and dry conditions for up to six months.
Vitamin D is essential for bone and immune health. Mushrooms are also a good source of other nutrients, including B vitamins (such as riboflavin, niacin, and B12) , selenium, potassium, phosphorus, and iron. They are low in calories and fat, making them a heart-healthy food choice. Additionally, mushrooms contain antioxidants and anti-inflammatory compounds, which may provide various health benefits, including a reduced risk of cancer, heart disease, Alzheimer's, and diabetes.
When purchasing mushrooms, choose firm, dry, and unbruised specimens. Store them in the refrigerator, and do not wash or trim them until it is time to cook. Mushrooms can be eaten raw or cooked, and they make a tasty and nutritious addition to any meal.
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Frequently asked questions
Yes, mushrooms are a nutrient-dense food. They are low in calories, fat, cholesterol and sodium, and are a good source of vitamins, minerals and antioxidants.
Mushrooms are a source of vitamin D, vitamin B2, B3, B5, B6, B9 (folate), potassium, calcium, selenium, copper, zinc, fibre and protein.
Mushrooms have been linked to a reduced risk of cancer, heart disease, diabetes, Alzheimer's, improved gut health, brain health and mental well-being.
Mushrooms are versatile and can be cooked in a variety of ways. They can be sautéed in a pan with olive oil, grilled, baked, or simmered in a pot of water. They can be used as a meat substitute in recipes such as sauces, soups, stir-fries, omelettes and burgers.

























