Mushrooms sit in the produce aisle next to onions and peppers, but biologically they are neither a fruit nor a vegetable. They belong to the fungi, a separate kingdom of life from plants.1Alliance of Bioversity International and CIAT. Understanding Vegetables: Categories, Diversity, and Nutrition Fungi are actually closer relatives of animals than of plants.2PubMed. Animals and fungi are each other’s closest relatives: congruent evidence from multiple proteins For cooking and healthy-eating guidelines, calling them a vegetable is perfectly correct.
Why Mushrooms Aren’t Plants at All
Plants use chlorophyll and sunlight to make their own food.3BYJUS. Are Mushrooms a Fruit or Vegetable? Fungi have no chlorophyll and can’t photosynthesize.4BYJUS. Are Mushrooms a Fruit or Vegetable? Instead, they release digestive enzymes into their surroundings and then absorb the nutrients.5ASM. Three Reasons Fungi Are Not Plants In nature, that makes many fungi decomposers, recycling dead material.6BYJUS. Are Mushrooms a Fruit or Vegetable? Others partner with living plant roots, helping the plant with nutrients in exchange for its sugars.7BigriverGold.com. Mycorrhiza vs. Saprotrophs: What Gardeners Need to Know About Mushroom Roles
Mushrooms were long lumped in with plants for a simple reason: they don’t move, and they grow out of soil or wood. Looks turned out to be misleading, because what matters is how an organism gets its food and what its cells are built from. A mushroom has no leaves, roots, or green color because it has no need for sunlight as an energy source, and many grow happily in dark cellars or sheds, which a plant could not do.
Their cell walls are built differently, too. Fungal walls are reinforced with chitin, a tough material plants never make.8PubMed Central. Fungal Chitin Synthases: Structure, Function, and Regulation Chitin is related in structure to cellulose, the material of plant walls.9Cellular and Molecular Biology of Filamentous Fungi. Plant Cell Wall and Chitin Degradation It’s also the substance found in insect and crab shells.
The mushroom you buy is only part of the organism. Most of a fungus is a hidden network of fine threads, called mycelium, running through soil, wood, or compost. The cap and stem are a temporary structure the fungus builds when conditions are right. Picking one doesn’t kill the organism, since the threads can spread across a large area and stay alive for years. That’s why the same patch can send up new mushrooms after a rain.
Genetic comparisons of several proteins place animals and fungi together, with plants on a separate line.10PubMed. Animals and fungi are each other’s closest relatives: congruent evidence from multiple proteins Biologists now widely accept that animals and fungi share a branch of the tree of life.11PubMed. A Search for the Origins of Animals and Fungi: Comparing and Combining Molecular Data
Why a Mushroom Isn’t a Fruit Either
Mushroom scientists call the visible mushroom a fruiting body because it produces and spreads spores.12greenland-food.com. Is a Mushroom a Vegetable or a Fruit? The name describes its job, being the reproductive part, by comparison with fruit.13greenland-food.com. Is a Mushroom a Vegetable or a Fruit? A botanical fruit, though, grows from a flower’s ovary and holds seeds. Mushrooms have no flowers, ovaries, or seeds, and spores aren’t seeds.14greenland-food.com. Is a Mushroom a Vegetable or a Fruit? So “fruiting body” is a correct term, but “a mushroom is a fruit” is misleading.15greenland-food.com. Is a Mushroom a Vegetable or a Fruit?
A seed holds a tiny embryo packed with stored food. A spore is a single microscopic cell with essentially no food supply. Because spores are so small and light, one mushroom can release them in enormous numbers, and air currents carry them far. Most never land somewhere suitable, so sheer quantity makes up for poor odds.
You can see this yourself. The thin gills under many caps are where spores form. Set a cap gill-side down on paper overnight, and it leaves a powdery pattern called a spore print, made of countless spores.
Why Mushrooms Count as a Vegetable in the Kitchen
Mushrooms aren’t part of a plant, so they don’t meet the botanical definition of a vegetable.16Real Mushrooms. Are Mushrooms Considered Vegetables? Recipes and grocery stores call them vegetables anyway, because of their taste, texture, and use.17Real Mushrooms. Are Mushrooms Considered Vegetables? Food-group systems do the same, classifying mushrooms as a vegetable by how they’re used.18PubMed Central. Mushrooms—Biologically Distinct and Nutritionally Unique
A tomato is a botanical fruit, since it grows from a flower and holds seeds, yet nearly every cook treats it as a vegetable because it goes into savory dishes. The same goes for cucumbers, peppers, and squash. “Vegetable” has never been a strict scientific group. It’s a loose label for foods used in the main part of a meal, usually savory rather than sweet.
The USDA’s MyPlate puts mushrooms in the “other vegetables” group, so half a cup of mushrooms counts as half a cup of vegetables.19PubMed Central. Nutritional impact of adding a serving of mushrooms to USDA Food Patterns – a dietary modeling analysis Half a cup is roughly a small handful of sliced raw mushrooms. They shrink a lot when cooked, so measure with that in mind. Stirring them into pasta sauce or eggs is an easy way to add a serving.
How Mushroom Protein Compares With Meat and Plants
Mushroom protein usually contains all the essential amino acids your body can’t make.20PubMed Central. Nutritional Quality and Biological Application of Mushroom Protein as a Novel Protein Alternative That matters because many plant proteins lack one or more of them, while a complete protein supplies them all in one food, which is unusual outside animal foods and soy. Mushroom protein is also rich in leucine and other amino acids mostly found in animal foods.21PubMed Central. Nutritional Quality and Biological Application of Mushroom Protein as a Novel Protein Alternative
The catch is quantity. Mushrooms have about 2 to 3 grams of protein per 100 grams, versus 20 to 26 grams in meat.22PubMed Central. Mushrooms as Sustainable Protein Alternatives: Nutritional–Functional Characterization and Innovative Applications in Meat Analogs, Functional Snacks, and Beverages On protein quality scores, they rank below meat and dairy but match or beat many plant foods.23PubMed Central. Nutritional Quality and Biological Application of Mushroom Protein as a Novel Protein Alternative
A normal side of mushrooms adds some protein but can’t carry a meal alone. If mushrooms are the main part of a meatless dish, add beans, lentils, eggs, tofu, cheese, or whole grains, and let the mushrooms provide flavor and bulk.
Swapping them in for part of the meat works better. Chop mushrooms finely and mix them into ground beef or turkey for burgers, meatballs, or tacos. The blend stretches the meat while keeping a similar texture, and the savory taste means the dish still tastes rich with less meat. Mushrooms are mostly water, so cook them first until their liquid evaporates, or the mix turns soggy.
Why Mushrooms Taste So Savory
Umami is the savory “fifth taste,” caused mainly by glutamate and a few related compounds, and it’s what you taste in broth and parmesan.24Trends in Food Science and Technology. Recent developments on umami ingredients of edible mushrooms – A review Edible mushrooms have a distinctive umami taste.25Trends in Food Science and Technology. Recent developments on umami ingredients of edible mushrooms – A review Different mushrooms get their savoriness from different compounds, and some are far more savory than others.26LWT. A comparative analysis of the umami taste of five fresh edible mushrooms by simulating the chemical environment of oral digestion in vitro King oyster mushrooms rank among the most savory common types.27LWT. A comparative analysis of the umami taste of five fresh edible mushrooms by simulating the chemical environment of oral digestion in vitro
To brown them, cook sliced mushrooms in a hot pan with a little oil, and let them sit without constant stirring so the surface can color. Browning creates new roasted, savory flavors on top of the savory taste they already have, so the flavor becomes more concentrated. Mushrooms release a lot of water, so a crowded pan fills with liquid and they steam, turning pale and rubbery instead of golden. Cook in batches or use a wide pan, and add salt near the end if you want them to brown more easily.
Dried mushrooms go further. Drying removes water and concentrates flavor, so a small amount of dried shiitake or porcini goes a long way. Soak them in hot water for about 20 to 30 minutes until soft, then slice and add them to the dish. The soaking liquid works like a light broth in soups, sauces, and risotto. Pour it in carefully, leaving any grit at the bottom of the bowl, or strain it through a coffee filter.
Nutrients Mushrooms Offer That Plants Don’t
All mushrooms contain ergosterol, a fungal compound similar to cholesterol.28Journal of Food Composition and Analysis. Vitamin D in Mushrooms Ultraviolet light converts some of it into vitamin D2.29Journal of Food Composition and Analysis. Vitamin D in Mushrooms So mushrooms exposed to UV light can be a meaningful vitamin D source, which is rare outside animal foods. Some growers deliberately expose mushrooms to UV to boost it.30PubMed. Generation of potentially bioactive ergosterol-derived products following pulsed ultraviolet light exposure of mushrooms (Agaricus bisporus)
At the store, look for wording such as “UV-treated” or “a source of vitamin D,” and check the nutrition label for a vitamin D amount. Ordinary mushrooms grown in the dark contain very little, because they never got the light that triggers the conversion. The label matters more than the type of mushroom, since treated and untreated versions of the same kind can differ widely. Wild or outdoor-grown mushrooms may contain more, but you can’t tell by looking.
A common home method is to slice mushrooms and set them gill-side up in direct sunlight for a while before cooking, letting the sun make vitamin D2 from ergosterol. The result depends on how strong the sun is and how long they sit, so you can’t know the exact amount. Cooking afterward is fine, though some vitamin D can be lost with heat. Treat it as a bonus, not a reliable replacement for other sources.
Mushrooms are also especially rich in ergothioneine, an antioxidant considered nearly unique to them.31PubMed Central. Mushroom-Derived Medicine? Preclinical Studies Suggest Potential Benefits of Ergothioneine for Cardiometabolic Health Oyster, shiitake, porcini, and common white or button mushrooms are among the richest sources.32PubMed Central. Antioxidant Compounds from Edible Mushrooms as Potential Candidates for Treating Age-Related Neurodegenerative Diseases Its health benefits are so far suggested mainly by early lab and animal research.33PubMed Central. Mushroom-Derived Medicine? Preclinical Studies Suggest Potential Benefits of Ergothioneine for Cardiometabolic Health Mushrooms also release more of their nutrients when cooked.34Healthysd.gov. Health Benefits and Culinary Uses of Mushrooms