The Health Benefits of Mushrooms: Nutrition, Science, and How to Cook Them

Mushrooms occupy a unique place in the natural world. They’re not plants — they don’t photosynthesise. They’re not animals — they don’t move or consume other organisms. They belong to their own kingdom, Fungi, and their biology is unlike that of anything else we eat. This distinctiveness extends to their nutritional profile: mushrooms offer a range of vitamins, minerals, and bioactive compounds that simply aren’t found in the same combination anywhere else in the food world.

They’re also, rather importantly, delicious. The deep, savoury umami flavour of a properly cooked mushroom is one of the most satisfying things in cooking, which is why mushrooms appear in cuisines across every continent, from Japanese dashi to French sauces to British pies. Understanding what makes them so nutritionally valuable is the first step to using them more confidently and more often.

This guide covers the science behind mushroom nutrition, the specific health benefits backed by research, a breakdown of the most useful varieties, and practical ways to cook them well. For recipes that make the most of mushrooms, check out the Mushroom Wheat Berry Risotto → and Mushroom and Wheat Berry Stuffed Zucchini Boats → already on this site.

The Nutritional Profile of Mushrooms

Mushrooms are genuinely low in calories — around 22 kcal per 100g for button mushrooms — but pack a surprising amount of nutritional value for that calorie count. Here’s the full breakdown for 100g of raw common mushrooms, based on data from the USDA FoodData Central:

Nutrient	Per 100g (raw)	% Daily Value
Calories	22 kcal	—
Protein	3.1g	6%
Carbohydrates	3.3g	1%
Fat	0.3g	0.4%
Fibre	1g	4%
Vitamin D	7.3mcg	37%
Riboflavin (B2)	0.4mg	31%
Niacin (B3)	3.6mg	22%
Pantothenic acid (B5)	1.5mg	30%
Selenium	9.3mcg	17%
Copper	0.3mg	33%
Potassium	318mg	7%
Phosphorus	86mg	7%

What stands out immediately is the vitamin D content — mushrooms are one of the very few non-animal food sources of this essential vitamin. They’re also exceptionally rich in several B vitamins and selenium, making them unusually valuable in plant-based diets.

The 8 Key Health Benefits of Mushrooms

1. One of the Only Plant-Based Sources of Vitamin D

Vitamin D deficiency is one of the most common nutritional deficiencies in the world, affecting an estimated 1 billion people according to research cited by Harvard T.H. Chan School of Public Health. Most food sources of vitamin D are animal-based — fatty fish, egg yolks, fortified dairy. This makes mushrooms uniquely valuable for vegetarians, vegans, and anyone with limited sun exposure.

Mushrooms produce vitamin D through the same mechanism as human skin — ultraviolet light triggers conversion of ergosterol (naturally present in the mushroom) into vitamin D2. Crucially, this means that exposing mushrooms to sunlight dramatically increases their vitamin D content. Placing sliced mushrooms gill-side up in direct sunlight for as little as 30–60 minutes can increase their vitamin D content up to 10 times. A simple, free technique worth knowing.

Farmed mushrooms grown indoors have less vitamin D than those exposed to UV light. Look for mushrooms specifically marketed as “UV-treated” or “vitamin D-enriched” if this benefit is a priority for you.

2. Rich in Immune-Supporting Beta-Glucans

Beta-glucans are a type of soluble fibre found in the cell walls of certain mushrooms — particularly shiitake, reishi, maitake, and oyster mushrooms. They have been extensively studied for their effects on the immune system.

Research published in the Journal of Traditional and Complementary Medicine has shown that beta-glucans can activate macrophages and natural killer cells — two of the immune system’s primary defences against pathogens and abnormal cells. They work as immunomodulators, meaning they help calibrate immune response rather than simply stimulating it indiscriminately.

This is why mushroom extracts, particularly from reishi and shiitake, are used in integrative medicine and are subjects of ongoing cancer research — not as treatments in themselves, but as adjuncts that may support the immune system’s function alongside conventional care.

3. Excellent Source of Antioxidants — Including Rare Ones

Mushrooms contain a range of antioxidant compounds, including selenium, vitamin C, and choline. But they’re also one of the best dietary sources of two particularly potent antioxidants: ergothioneine and glutathione.

Research from Penn State University, published in Food Chemistry, found that mushrooms contain higher concentrations of ergothioneine and glutathione than almost any other food tested. These two antioxidants work synergistically to protect cells from oxidative stress — the damage caused by free radicals that is associated with ageing and the development of many chronic diseases.

Ergothioneine is particularly interesting because the human body has developed a dedicated transporter protein specifically for it, suggesting it plays an important evolutionary role. Porcini mushrooms have the highest concentrations of both compounds; common button mushrooms are also a good source.

4. Supports Heart Health

Several mechanisms by which mushrooms support cardiovascular health have been identified in research:

Beta-glucan and cholesterol: The soluble fibre in mushrooms, including beta-glucan, binds to cholesterol in the digestive tract and removes it from the body before absorption — similar to the mechanism of oats. Research has linked regular beta-glucan consumption with meaningful reductions in LDL (bad) cholesterol.

Potassium and blood pressure: Mushrooms are a good source of potassium, which counteracts the blood-pressure-raising effects of sodium. Higher dietary potassium intake is consistently associated with lower blood pressure in epidemiological research.

Sterols: Mushrooms contain naturally occurring sterols — plant-based compounds that compete with cholesterol for absorption in the digestive tract and help reduce circulating cholesterol levels.

5. Anti-Inflammatory Properties

Chronic low-grade inflammation is increasingly understood as a driver of many serious diseases. Several compounds in mushrooms have demonstrated anti-inflammatory activity in laboratory and clinical research.

Polysaccharides in shiitake and maitake mushrooms have been shown to reduce inflammatory markers, including TNF-α and IL-6, in multiple studies. The antioxidants ergothioneine and glutathione also reduce oxidative stress, which drives inflammation. For anyone interested in eating specifically to reduce inflammation, mushrooms are one of the most evidence-backed additions to make — check out the Anti-Inflammatory Meal Plans guide → for a full eating pattern built around this principle.

6. Supports Brain Health and Cognitive Function

Two areas of mushroom research related to brain health have attracted significant attention:

Lion’s mane mushrooms (Hericium erinaceus) contain compounds called hericenones and erinacines that have been shown in multiple studies to stimulate the production of Nerve Growth Factor (NGF) — a protein essential for the growth, maintenance, and survival of neurons. A double-blind placebo-controlled trial published in Phytotherapy Research found that older adults who consumed lion’s mane mushroom extract for 16 weeks showed significantly improved cognitive function scores compared to the placebo group.

Ergothioneine is also being studied for neuroprotective effects. Some researchers have hypothesised that its role as a cellular antioxidant is particularly important in neural tissue, which is highly vulnerable to oxidative damage.

7. Helpful for Weight Management

With only 22 kcal per 100g, mushrooms are one of the lowest-calorie foods available. Their umami flavour and meaty texture mean they provide satiety and satisfaction disproportionate to their calorie content.

Research has explored using mushrooms as a direct substitute for meat — replacing mince in dishes like bolognese, stuffed peppers, or tacos. Multiple studies have found that participants who substituted mushrooms for red meat reported equal or greater satisfaction with their meals while consuming significantly fewer calories. The Mushroom and Wheat Berry Stuffed Zucchini Boats → on this site is a perfect example of mushrooms providing real substance in a low-calorie dish.

8. Rich in B Vitamins for Energy

Mushrooms are one of the best plant-based sources of B vitamins — particularly riboflavin (B2), niacin (B3), and pantothenic acid (B5). These vitamins play central roles in energy metabolism, helping convert the food you eat into usable cellular energy.

B vitamins are particularly important in plant-based diets, where B12 (found only in animal products) often needs supplementing. While mushrooms don’t contain B12, their generous supply of B2, B3, and B5 makes them a genuinely valuable addition to any diet — and especially to vegetarian and vegan eating patterns.

A Guide to the Most Common Mushroom Varieties

Not all mushrooms are the same. Here’s a practical guide to the varieties you’re most likely to find and what each one is best used for:

Button mushrooms are the most widely available and mildest. Suitable for everything from salads to soups to sautéing. The familiar flavour most people associate with mushrooms. Good nutritional profile for their low cost.

Chestnut mushrooms are slightly more mature than button mushrooms, with a deeper, earthier flavour and firmer texture. The best everyday choice for cooking — better flavour than button mushrooms without significantly more cost. Excellent in risottos, pasta sauces, and stir-fries.

Portobello mushrooms are fully mature chestnut mushrooms — large, dense, and deeply savoury. Their thick caps make them ideal for grilling, roasting, or stuffing. They can substitute for meat in burgers and are the most substantial mushroom for plant-based cooking.

Shiitake mushrooms have an intense, complex, almost smoky umami flavour that goes well beyond what any button mushroom can offer. Among the most nutritionally wide varieties, high in beta-glucans, B vitamins, and copper. Excellent in stir-fries, broths, and the Mushroom Wheat Berry Risotto →

Oyster mushrooms are delicate, slightly sweet, and cook very quickly — often used in Asian cooking. They have a silky texture when cooked and frilly edges that become slightly crispy in a hot pan. High in beta-glucans.

Porcini mushrooms (ceps) have the most intensely flavourful flesh of any common mushroom — rich, nutty, and deeply savoury. Available fresh in autumn or dried year-round. Dried porcini rehydrated in hot water add extraordinary depth to risottos, pasta dishes, and soups. The soaking liquid is also intensely flavoured and should be added to the dish.

Reishi mushrooms are bitter and tough in their whole form — not typically eaten as food but used in powdered supplements and teas for their immune-supporting compounds. Of all the “functional” mushrooms, reishi has the most research behind it.

Lion’s mane mushrooms are increasingly available in health food shops. They have a seafood-like texture when cooked and a mild flavour. Most promising for cognitive benefits based on current research.

How to Get the Most from Mushrooms in Your Kitchen

Cook them at high heat. This is the single most important thing to know about cooking mushrooms. High heat drives off their water content quickly and allows the surfaces to caramelise — creating the deep, golden colour and rich flavour that makes mushrooms so satisfying. Low heat causes them to steam in their own liquid, producing grey, watery results with flat flavour. See the full technique in our Mushroom and Wheat Berry Salad

Don’t crowd the pan. Mushrooms need space for steam to escape. Overcrowding traps moisture and turns sautéing into steaming. Cook in batches if necessary.

Season at the end. Adding salt at the beginning of cooking draws moisture out of mushrooms rapidly. Wait until they’re golden before seasoning — you’ll get a better result.

Use dried mushrooms for depth. A handful of dried porcini mushrooms rehydrated in boiling water for 15 minutes adds extraordinary savoury depth to any dish. Add the mushrooms and the strained soaking liquid for maximum impact.

Exposure to sunlight before cooking. Place sliced mushrooms gill-side up on a tray in direct sunlight for 30–60 minutes before cooking. This significantly increases their vitamin D content at zero cost.

Eat them regularly. The benefits of mushrooms — particularly beta-glucans and ergothioneine — accumulate with regular consumption. A few times per week is far more beneficial than an occasional large serving.

Practical Ways to Add More Mushrooms to Your Diet

In grain dishes: Sautéed mushrooms stirred through quinoa, brown rice, or wheat berries create a deeply satisfying, nutrient-dense bowl. Try the Mushroom Wheat Berry Risotto → for the definitive version of this combination.

As a stuffing: Chopped mushrooms sautéed with garlic and herbs make an excellent filling for stuffed vegetables. The Mushroom and Wheat Berry Stuffed Zucchini Boats → is a brilliant example — earthy, satisfying, and genuinely beautiful to look at.

In salads: Golden, sautéed mushrooms added warm to a grain salad wilt the herbs slightly and create a wonderful contrast with the cool, dressed ingredients. Check out the Mushroom and Wheat Berry Salad → for a fully worked example.

As a meat substitute: Finely chopped or minced mushrooms can replace some or all of the meat in bolognese, tacos, and stuffed peppers. Their umami flavour and texture mean the dish remains deeply satisfying.

In soups: A simple mushroom soup with garlic, thyme, and a splash of cream is one of the most comforting things you can make in under 30 minutes. Use chestnut or porcini mushrooms for the deepest flavour.

As a simple side, Sautéed mushrooms with garlic and thyme, finished with a squeeze of lemon and fresh parsley, are one of the simplest and most satisfying vegetable sides in existence. Takes 8 minutes.

Frequently Asked Questions

Are mushrooms safe to eat every day? Yes — for most healthy people, eating culinary mushrooms every day is completely safe and beneficial. They’re low in calories and rich in nutrients, making them an excellent addition to any meal. Medicinal mushroom extracts (reishi, lion’s mane in concentrated supplement form) should be used as directed and discussed with a healthcare professional if you have any health conditions.

Do mushrooms need to be cooked? Most culinary mushrooms can be eaten raw, but cooking significantly improves both their flavour and nutrient availability. Heat breaks down chitin — the tough cell wall material in mushrooms — which releases the nutrients inside and makes them more bioavailable. Raw mushrooms also contain a small amount of a mildly toxic compound (agaritine), which is destroyed by cooking. For all practical purposes, cook your mushrooms.

Why do my mushrooms always go watery when I cook them? Two reasons: the pan was too crowded (steam can’t escape) or the heat was too low (they steam rather than sear). Use a wide pan, cook in batches if needed, and use high heat. Don’t stir for the first 3–4 minutes — let the surfaces caramelise before moving them.

Are dried mushrooms as nutritious as fresh? Dried mushrooms are more concentrated in flavour and most nutrients because the water has been removed. They’re an excellent pantry staple, particularly for adding depth to dishes. They do lose some vitamin C in the drying process, but most other nutrients are retained or even concentrated.

What’s the difference between “functional” mushrooms and culinary mushrooms? Culinary mushrooms — button, chestnut, portobello, shiitake, oyster — are eaten primarily as food. “Functional” mushrooms — reishi, lion’s mane, cordyceps, chaga — are used primarily for their medicinal properties, often in supplement or extract form, and have varying palatability as food. Many culinary mushrooms (particularly shiitake) also have meaningful functional properties, blurring this distinction somewhat.

Can I grow my own mushrooms at home? Yes — mushroom growing kits are widely available and surprisingly easy to use. Oyster and lion’s mane mushrooms are the most beginner-friendly. Growing your own means you can control exposure to UV light and harvest them at peak freshness.

Nutrition Comparison: Common Mushroom Varieties (per 100g raw)

Variety	Calories	Protein	Vitamin D	Beta-Glucans
Button	22 kcal	3.1g	7mcg	Moderate
Chestnut	38 kcal	3.6g	3mcg	Moderate
Portobello	29 kcal	2.1g	4mcg	Moderate
Shiitake	34 kcal	2.2g	1mcg	High
Oyster	33 kcal	3.3g	1mcg	High
Porcini	27 kcal	3.9g	3mcg	Moderate

Values are approximate. Beta-glucan content varies significantly based on growing conditions and variety.

Final Thoughts

Mushrooms are genuinely remarkable ingredients — nutritionally, culinarily, and biologically. They offer vitamin D in a form almost absent from plant foods, immune-supporting beta-glucans, rare antioxidants like ergothioneine and glutathione, and a collection of B vitamins valuable to anyone eating less meat.

And they taste extraordinary when cooked properly. High heat, space in the pan, and patience to let them caramelise — those three principles unlock the full flavour potential of any mushroom variety.

Start adding them more regularly — to grain dishes, salads, soups, and as simple sides — and let the cumulative nutritional benefits do their work. For recipe inspiration, the Mushroom Wheat Berry Risotto → is the best place to start.

For more guides on the nutritional value of specific ingredients, check out our Nutritional Value of Green Peas → and the High-Fiber Meal Plans guide →

This post provides general nutritional information only and is not a substitute for personalised medical or dietary advice.

Found this guide helpful? Share it on Pinterest or Facebook!