Mushrooms: The Nutritional Powerhouse
You’re Probably Underestimating

Q: Q1. Which Indian mushroom is best for iron deficency?

Paddy Straw Mushroom (1.43mg Fe/100g FW) and Indian Oyster (1.10mg Fe/100g FW) are the best Indian mushroom sources of iron. Crucially, both also contain significant Vitamin C (Paddy Straw 20.2mg; Indian Oyster 16.5mg), which dramatically enhances non-haem iron absorption. This natural iron + Vitamin C combination in the same food is rare and nutritionally very valuable — ideal for vegetarian women managing iron deficiency.

Q: Q2. Can Mushroom replace meat protein for vegiterians?

Mushrooms are excellent protein supplements for vegetarian diets. They contain all 8 essential amino acids with 72–83% protein digestibility. Milky Mushroom (3.9g/100g FW) and Porcini (3.7g/100g FW) top the protein list. Combined with pulses or paneer in Indian cooking, mushrooms create high-quality complete protein meals. While they can’t replace meat calorie-for-calorie in protein density, regular inclusion significantly improves amino acid profile in vegetarian diets.

Q: Q3. How can I get more Vitamin D from mushrooms without supliments?

Place fresh mushrooms (any variety, including Milky or Paddy Straw) gill-side up in direct afternoon sunlight for 15–30 minutes before cooking. Ergosterol in the mushroom cell membrane converts to Vitamin D2 through exactly the same UV-B mechanism as human skin. White Button can reach 346 IU/100g; Shiitake up to 600 IU/100g. This Vitamin D is retained even after cooking. Dried sun-exposed mushrooms keep their D2 content for months.

Q: Q4. How much should I eat and how often?

ICMR-NIN recommends including mushrooms within the 300g/day vegetable intake. Practically: 50–100g cooked, 3–4 times per week. For specific goals — immunity: Oyster/Shiitake for β-glucans; cholesterol: Oyster for Lovastatin; bone health: UV-treated any variety for Vit D; iron + Vit C: Paddy Straw or Indian Oyster; protein: Milky Mushroom. Indian varieties are particularly recommended for daily consumption due to freshness (shorter supply chains) and affordability.

Q: Q5. Is Paddy Straw Mushroom safe to eat? What about Volvatoxin?

Yes — thoroughly cooked Paddy Straw Mushroom is completely safe. It is the world’s 3rd most consumed mushroom and a dietary staple for hundreds of millions across East and South Asia. Volvatoxin is a polypeptide that can be harmful at high isolated concentrations but is fully inactivated by cooking (boiling, sautéing, or pressure-cooking for ≥5 minutes). Never eat Paddy Straw raw.

A complete, science-backed guide to the macronutrients, micronutrients, and bioactive compounds across 12 key species — including unique Indian varieties.

Our Mushrooms Nutrition Facts database offers a comprehensive look at one of nature’s most unique superfoods. This guide features 12 nutritional profiles, providing a detailed breakdown of macros and micronutrients for every variety listed. By exploring these Mushrooms Nutrition Facts, you can discover the high antioxidants in edible mushrooms and easily identify the best low calorie mushroom varieties for your dietary goals. Whether you are searching for a plant-based protein alternative in our meat substitute nutrition database or simply tracking the precise macros and micronutrients in mushrooms, these Mushrooms Nutrition Facts deliver the exact data you need to optimize your meals.

Complete Mushrooms Nutrition Facts Guide

Mushrooms occupy a wholly unique position in human nutrition — neither plant nor animal, yet borrowing the best of both kingdoms.

Fungi have been consumed and revered across cultures for millennia. In India, oyster mushrooms (Pleurotus spp.) form a cornerstone of tribal diets in states like West Bengal, Odisha, and Himachal Pradesh. In Japan, shiitake and enoki are cultural staples. In Europe, porcini (cep) and button mushrooms anchor culinary traditions from Italy to France.

Yet the full nutritional story of mushrooms remains underappreciated in mainstream dietary guidance. Most people know mushrooms are “healthy” — but few understand why: that they are the only plant-derived food to naturally produce Vitamin D; that oyster mushrooms contain lovastatin, a natural cholesterol-lowering compound; that shiitake and porcini are among the richest known dietary sources of ergothioneine, an antioxidant now being studied as a potential “longevity vitamin.”

This article provides a comprehensive, data-driven nutritional analysis of 12 major edible mushroom species — seven internationally recognised varieties and three cultivated prominently in India — drawing on USDA FoodData Central, peer-reviewed research, TNAU and Indian scientific literature including work from the All India Coordinated Mushroom Improvement Project (AICMIP).

Nutrition Cards

22–37 kcal

Energy per 100g

2–4 g

Protein per 100g

<0.5 g

Fat per 100g

15+

Essential Nutrients

600 IU

Vit D (UV-treated / 100g)

Key InsightMushrooms are classified as fungi, not plants. Their cell walls are made of chitin (not cellulose), they synthesise ergosterol (not phytosterols), and they can produce Vitamin D2 — making them uniquely positioned between the plant and animal kingdoms from a nutritional perspective.

Species Overview

This guide covers ten species spanning the spectrum from everyday grocery staples to India-specific cultivated varieties and specialty health-promoting mushrooms.

White Button

Agaricus bisporus

World’s most consumed mushroom (~38% global market)
Mild flavour, highly versatile
UV treatment dramatically boosts Vitamin D
Good source of riboflavin, niacin, copper

Cremini / Baby Bella

A. bisporus (brown var.)

Same species as white button — simply more mature
Notably highest selenium: ~26 µg / 100g
Richer, earthier flavour than white button
Higher potassium than white button

Portobello

A. bisporus (mature)

Fully matured cremini — meaty texture
Highest potassium of all button variants: 484 mg
Excellent grilling mushroom — retains nutrients well

Shiitake

Lentinula edodes

Rich source of lentinan (immune-active β-glucan)
Contains lovastatin — natural HMG-CoA reductase inhibitor
Among highest in ergothioneine (5 mg/100g DW)
Highest Vitamin B6 (0.29 mg) and ergosterol (73 mg)

Oyster

Pleurotus ostreatus

Highest β-glucan content (0.79 g/100g FW)
Natural lovastatin: 50–607 mg/kg dry weight
High iron (1.33 mg) and niacin (4.96 mg)
Widely cultivated in India on paddy straw

Indian Oyster

Pleurotus sajor-caju

First isolated in India; ideal for tropical cultivation
Cultivated across Maharashtra, Karnataka, UP
Higher Vitamin C (16.5 mg) than western varieties
Rich in quercetin (4.7 mg/g DW) — potent antioxidant
Calcium: ~12 mg/100g FW (highest among oysters)

Enoki

Flammulina velutipes

Highest GABA content (~230 mg/kg DW)
Highest niacin (6.6 mg) and thiamine (0.22 mg)
Highest folate: 52 µg / 100g
Highest carbohydrates (7.81 g) and sugars among all

Maitake

Grifola frondosa

Contains grifolan (D-Fraction) — immunomodulatory
Studied for blood glucose management
Good source of niacin (6.59 mg) and copper

King Oyster

Pleurotus eryngii

Highest potassium among all oyster varieties: 485 mg
Highest pantothenic acid (B5): 2.06 mg
High ergosterol (90 mg) and β-glucans (0.60 g)

Porcini / Cep

Boletus edulis

Richest known dietary source of ergothioneine (7.3 mg/100g DW)
Highest protein (3.70 g) and copper (0.61 mg)
High glutathione and polyphenols
Prized European wild mushroom (porcini in Italian cuisine)

Paddy Straw

Volvariella volvacea

Highest Vitamin C (20.2 mg) among all 12 varieties
Selenium: 15.2 µg / 100g — 28% RDA per serving
High iron (1.43 mg) — pairs with own Vit C for absorption
Folate: ~38 µg / 100g — supports cell division
Contains Zymosan — macrophage activator, anti-tumour
Grown on rice straw; ready to harvest in 10–12 days

Milky Mushroom

Calocybe indica

Highest protein (3.9 g) among Indian cultivated species
Riboflavin B2: 0.45 mg — highest among Indian varieties
Vitamin C: 12.0 mg / 100g — unusual for a mushroom
Vitamin E: 0.20 mg — antioxidant support
Calcium: 20 mg / 100g — best among cultivated mushrooms
Heat-tolerant (30–38°C); shelf life 5–7 days

Macronutrient Composition

All mushrooms are extremely low in calories, making them an ideal nutrient-dense food. Their macronutrient profile is dominated by water (87–92%), with modest carbohydrates, useful protein, and negligible fat. The quality of mushroom protein is notable — it contains all essential amino acids, though in lower absolute quantities than animal proteins.

Mushroom protein digestibility is lower than animal protein due to the presence of chitin in cell walls, which inhibits some enzymatic activity. However, cooking improves bioavailability significantly. The protein efficiency ratio (PER) of Pleurotus species is comparable to skimmed milk (PER ~2.4–2.7).

Table 1 — Macro Composition per 100g Raw Fresh Weight

Mushroom	Species / Variety	Energy (kcal)	Water (g)	Protein (g)	Total Fat (g)	Carbohydrates (g)	Dietary Fibre (g)	Sugars Total (g)	Ash (g)	Chitin (g)	Mannitol (g)
White Button	(Agaricus bisporus)	22	92.2	3.09	0.34	3.26	1.00	1.98	0.91	0.70	0.60
Cremini	(A. bisporus var.)	22	91.8	3.23	0.34	4.30	1.00	1.98	0.95	0.70	0.60
Portobello	(A. bisporus)	22	92.0	2.57	0.35	3.87	1.30	2.05	1.20	0.70	0.62
Shiitake	(Lentinula edodes)	34	89.7	2.24	0.49	6.79	2.50	2.38	0.80	0.90	1.20
Oyster	(Pleurotus ostreatus)	33	89.2	3.31	0.41	4.19	2.30	0.46	0.90	1.00	0.40
Indian Oyster	(P. sajor-caju)	35	90.0	3.10	0.40	4.50	2.50	0.50	1.10	1.10	0.50
Enoki	(Flammulina velutipes)	37	87.7	2.66	0.29	7.81	2.80	4.98	0.79	0.80	1.80
Maitake	(Grifola frondosa)	31	90.2	1.94	0.21	6.97	2.70	1.52	0.52	0.70	0.80
King Oyster	(P. eryngii)	35	89.6	2.46	0.17	5.73	2.80	0.95	1.03	1.00	0.70
Porcini	(Boletus edulis)	29	90.8	3.70	0.49	4.03	1.50	0.72	0.99	0.80	0.35
Milky Mushroom	(Calocybe indica)	38	88.5	3.90	0.40	5.20	1.60	1.20	1.50	0.90	0.45
Paddy Straw	(Volvariella volvacea)	32	90.4	3.60	0.50	5.00	2.80	4.98	0.79	0.80	1.80

All mushrooms contain

zero cholesterol— they are completely cholesterol-free. The ergosterol they do contain is structurally similar to cholesterol but is a plant/fungal sterol that does not raise LDL levels. In fact, oyster mushrooms contain lovastatin — a compound that actively lowers cholesterol by inhibiting HMG-CoA reductase, the same pathway targeted by pharmaceutical statins.

Vitamins

All vitamins in one table — B-complex (B1 through B12), Choline, Vitamin C, Vitamin D2 (both indoor-grown and UV-treated), Vitamin E, and Vitamin K1 — per 100g raw fresh weight.

Mushrooms are exceptional sources of B-complex vitamins, particularly niacin (B3), riboflavin (B2), and pantothenic acid (B5). They are the only non-animal food that naturally produces Vitamin D — though the amount varies dramatically based on light exposure during growing.

Table 2 — Complete Vitamin Profile | per 100g raw fresh weight

Mushroom	Species / Variety	B1 Thiamine (mg)	B2 Riboflavin (mg)	B3 Niacin (mg)	B5 Pantothenic Acid (mg)	B6 Pyridoxine (mg)	B7 Biotin (est.) (µg)	B9 Folate (µg)	B12 Cobalamin (µg)	Choline (mg)	Vit D2 indoor-grown (IU)	Vit D2 UV-treated (IU)	Vit D2 indoor (µg)	Vit E α-Tocopherol (mg)	Vit K1 Phylloquin. (µg)	Vitamin C (mg)	Vitamin A (β-car.) µg RAE
White Button	(Agaricus bisporus)	0.073	0.40	3.61	1.50	0.073	9	17	0.040	16.7	7	346	0.17	0.010	0.20	2.10	0.50
Cremini	(A. bisporus var.)	0.073	0.40	4.01	1.50	0.073	9	16	0.040	16.7	7	346	0.17	0.010	0.20	2.10	0.50
Portobello	(A. bisporus)	0.086	0.35	3.83	1.08	0.14	10	25	0.040	20.1	7	400	0.17	0.010	0.20	2.20	0.50
Shiitake	(Lentinula edodes)	0.015	0.22	3.88	1.50	0.29	18	13	0.000	27.2	18	600	0.45	0.050	0.10	3.50	1.00
Oyster	(Pleurotus ostreatus)	0.13	0.35	4.96	1.29	0.11	13	38	0.000	38.7	8	400	0.20	0.11	0.20	2.50	0.80
Indian Oyster	(P. sajor-caju)	0.18	0.33	5.50	1.35	0.10	12	32	0.000	35.0	8	350	0.20	0.10	0.20	16.5	1.00
Enoki	(Flammulina velutipes)	0.22	0.20	6.60	1.35	0.052	7	52	0.000	22.0	11	200	0.28	0.10	0.10	0.000	0.30
Maitake	(Grifola frondosa)	0.15	0.24	6.59	0.27	0.047	8	19	0.000	18.3	7	300	0.17	0.010	0.10	0.000	0.50
King Oyster	(P. eryngii)	0.072	0.46	4.54	2.06	0.15	10	28	0.000	38.7	5	350	0.12	0.10	0.20	3.10	0.80
Porcini	(Boletus edulis)	0.031	0.35	4.08	1.75	0.11	12	17	0.000	45.0	10	400	0.25	0.010	0.20	4.00	0.50
Milky Mushroom	(Calocybe indica)	0.12	0.45	4.10	0.80	0.12	10	25	0.05	22.0	6	300	0.15	0.20	0.20	12	2.00
Paddy Straw	(Volvariella volvacea)	0.15	0.33	4.00	0.75	0.10	10	69	0.080	20.0	6	280	0.15	0.38	0.20	20.2	1.50

Vitamin D — Critical Note

Indoor-grown mushrooms provide very little Vitamin D (<20 IU/100g). UV-treated or sun-exposed mushrooms convert ergosterol to Vitamin D2, reaching up to 600 IU/100g in shiitake — providing 75% of the adult Daily Value (800 IU, FDA 2020) in a single serving.

Minerals

A single comprehensive table covering all 15 minerals — 6 macro minerals and 9 trace elements — per 100g raw fresh weight. Mushrooms are exceptional sources of potassium, copper, and selenium compared to most vegetables.

Mushrooms are outstanding sources of minerals, particularly potassium, phosphorus, copper, and selenium. Their mineral profile is distinctly more similar to vegetables than to typical fungi.

Table 3 — Complete Mineral Profile | per 100g raw fresh weight

Mushroom	Species / Variety	Potassium K (mg)	Phosphorus P (mg)	Sodium Na (mg)	Magnesium Mg (mg)	Calcium Ca (mg)	Sulphur S est. (mg)	Copper Cu (mg)	Selenium Se (µg)	Zinc Zn (mg)	Iron Fe (mg)	Manganese Mn (mg)	Chromium Cr est. (µg)	Iodine I est. (µg)	Molybdenum Mo est. (µg)	Fluoride F (µg)
		MACRO MINERALS (per 100g FW)						TRACE MINERALS (per 100g FW)
White Button	(Agaricus bisporus)	318	86	5	9	3	45	0.32	9.30	0.52	0.47	0.047	4	3	10	3
Cremini	(A. bisporus var.)	448	101	5	9	3	45	0.32	26.0	0.52	0.47	0.047	4	3	10	3
Portobello	(A. bisporus)	484	108	9	9	3	45	0.29	0.40	0.52	0.29	0.11	4	3	10	3
Shiitake	(Lentinula edodes)	304	112	9	20	3	50	0.14	5.70	1.33	0.41	0.23	5	4	12	2
Oyster	(Pleurotus ostreatus)	420	120	18	18	3	55	0.24	2.60	0.77	1.33	0.11	5	4	12	2
Indian Oyster	(P. sajor-caju)	360	105	15	10	12	50	0.25	3.50	0.80	1.10	0.10	4	4	10	2
Enoki	(Flammulina velutipes)	359	105	3	10	4	40	0.11	0.50	0.65	1.15	0.047	3	2	8	2
Maitake	(Grifola frondosa)	204	74	1	10	1	40	0.26	0.80	0.75	0.30	0.065	3	2	8	2
King Oyster	(P. eryngii)	485	130	10	22	3	52	0.34	0.30	0.80	0.80	0.10	4	3	10	2
Porcini	(Boletus edulis)	324	96	3	11	3	48	0.61	3.30	0.98	0.92	0.20	5	3	10	2
Milky Mushroom	(Calocybe indica)	390	100	12	11	20	48	0.20	3.00	0.67	0.80	0.090	4	3	10
Paddy Straw	(Volvariella volvacea)	360	61	15	9	14	45	0.24	15.2	0.67	1.43	0.082	4	3	10

Mineral Highlights

Porcini provides 0.61 mg copper per 100g — ~68% of the adult daily value in one serving. Cremini mushrooms stand out with 26 µg selenium per 100g, nearly 50% DV — far exceeding most common vegetables. King Oyster leads on potassium (485 mg) and phosphorus (130 mg) among all ten species.

Macros per Serving

A practical single table showing all key macros and micronutrients per standard serving (84g / 3 oz) for every mushroom variety and common preparation method, with % Daily Values for the most nutritionally relevant nutrients.

Serving Reference

Standard serving = 84g (3 oz / ~1 cup sliced, raw). Shiitake dried = 15g (¼ cup) as commonly used in recipes. UV-treated = mushrooms placed gill-side up in direct sunlight for 30–60 min before consuming or cooking. %DV per FDA 2020 (2,000 kcal diet).

Table 4 — Complete Macros per Serving | Standard serving 84g (3 oz)

		SERVING	MACROS					KEY MICRONUTRIENTS & %DV
Mushroom	Form / Prep	Serving (g)	Calories (kcal)	Protein (g)	Fat (g)	Carbs (g)	Fibre (g)	Potassium (K) (mg)	K %DV	Selenium (µg)	Se %DV	Niacin B3 (mg / %DV)	Vitamin D (IU / %DV)
White Button	Raw	84	18	2.60	0.29	2.70	0.80	267	6%	7.80	14%	3.0 / 19%	6 / <2%
White Button	UV-treated	84	18	2.60	0.29	2.70	0.80	267	6%	7.80	14%	3.0 / 19%	291 / 36%
White Button	Stir-fried	84	23	3.00	0.30	2.90	0.90	295	6%	8.40	15%	3.6 / 22%	6 / <2%
Cremini	Raw	84	19	2.70	0.29	3.60	0.80	376	8%	21.80	40%	3.4 / 21%	6 / <2%
Portobello	Raw	84	18	2.20	0.29	3.30	1.10	406	9%	0.30	<1%	3.2 / 20%	6 / <2%
Portobello	Grilled	84	26	2.50	0.46	4.40	1.30	521	11%	0.30	<1%	4.8 / 30%	7 / <2%
Shiitake	Raw	84	29	1.90	0.41	5.70	2.10	255	5%	4.80	9%	3.3 / 20%	15 / 2%
Shiitake	Stir-fried	84	43	2.70	0.55	7.90	2.70	340	7%	6.40	12%	4.4 / 28%	19 / 2%
Shiitake	Dried (¼ cup)	15	40	1.30	0.12	9.60	1.50	117	2%	2.20	4%	1.1 / 7%	7 / 1%
Oyster	Raw	84	28	2.80	0.34	3.50	1.90	353	8%	2.20	4%	4.2 / 26%	7 / <2%
Indian Oyster	Raw	84	29	2.60	0.34	3.80	2.10	302	6%	2.90	5%	4.6 / 29%	7 / <2%
Enoki	Raw	84	31	2.20	0.24	6.60	2.40	302	6%	0.40	<1%	5.5 / 34%	9 / 1%
Maitake	Raw	84	26	1.60	0.18	5.90	2.30	171	4%	0.70	1%	5.5 / 34%	6 / <2%
King Oyster	Raw	84	29	2.10	0.14	4.80	2.40	407	9%	0.30	<1%	3.8 / 24%	4 / <1%
Porcini	Raw	84	24	3.10	0.41	3.40	1.30	272	6%	2.80	5%	3.4 / 21%	8 / 1%
Milky Mushroom	Raw	84	32	3.30	0.34	4.40	1.30	328	7%	2.50	5%	3.4 / 21%	5 / <2%
Milky Mushroom	Stir-fried	84	38	3.60	0.36	4.80	1.50	345	7%	2.70	5%	3.8 / 24%	5 / <2%
Paddy Straw	Raw	84	27	3.00	0.42	4.20	1.50	302	6%	12.80	23%	3.4 / 21%	5 / <2%
Paddy Straw	Canned	182	58	6.00	0.80	8.40	3.00	655	14%	27.70	50%	6.9 / 43%	11 / 1%

Bioactive Compounds

Beyond conventional nutrients, mushrooms contain a remarkable array of biologically active compounds not found in most other foods. These compounds are increasingly being studied for their roles in immune modulation, cardiovascular health, neuroprotection, and cancer prevention.

Table 5 — Key Bioactive Compounds (per 100g fresh weight unless noted)

Nutrient	β-Glucans Total	β-1,3-Glucan est.	β-1,6-Glucan est.	Lentinan (Shiitake)	Grifolan/D-Frac (Mait.)	Volvatoxin (Paddy Str.)	Chitin	Ergosterol	Ergothioneine	Ergothioneine FW est.	Glutathione	Total Polyphenols	Quercetin	Flavonoids (total est.)	Lovastatin (statin)	GABA	Adenosine	1-Octen-3-ol (aroma)	Mannitol	Trehalose	Zymosan (immunomod.)
	POLYSACCHARIDES & STRUCTURAL (per 100g FW)								ANTIOXIDANTS (per 100g DW unless noted)						SPECIAL BIOACTIVE COMPOUNDS
Unit	g/100g FW	g/100g FW	g/100g FW	mg/100g FW	mg/100g FW	µg/g DW	g/100g FW	mg/100g FW	mg/100g DW	mg/100g FW	mg/100g DW	mg GAE/100g FW	mg/100g DW	mg/100g DW	mg/kg DW	mg/kg DW	mg/100g DW	µg/kg FW	g/100g FW	g/100g FW	presence
White Button (Agaricus bisporus)	0.21	0.13	0.080	—	—	—	0.70	57	1.30	0.11	0.70	4.00	—	5.00	0	5–20	0.80	300	0.60	1.14	—
Cremini (A. bisporus var.)	0.22	0.13	0.090	—	—	—	0.70	57	1.80	0.16	0.80	4.50	—	5.50	0	5–20	0.80	300	0.60	1.14	—
Portobello (A. bisporus)	0.25	0.15	0.10	—	—	—	0.70	57	1.80	0.16	0.80	5.00	—	6.00	0	5–20	0.80	350	0.62	1.20	—
Shiitake (Lentinula edodes)	0.50	0.30	0.20	15–40	—	—	0.90	73	5.00	0.45	1.70	10.0	—	12.0	0–2	15–50	3.50	450	1.20	1.44	—
Oyster (Pleurotus ostreatus)	0.79	0.47	0.32	—	—	—	1.00	73	3.20	0.29	1.00	8.50	1.5	10.0	50–607	20–80	1.50	420	0.40	0.000	—
Indian Oyster (P. sajor-caju)	0.70	0.42	0.28	—	—	—	1.10	65	3.00	0.27	0.90	9.00	4.7	11.0	10–50	20–60	1.30	430	0.50	0.000	—
Milky Mushroom (Calocybe indica)	0.45	0.27	0.18	—	—	—	0.90	55	2.00	0.18	0.80	6.50	2.0	8.00	0–5	10–30	1.00	350	0.45	0.80	—
Paddy Straw (Volvariella volvacea)	0.40	0.24	0.16	—	—	pres.	0.80	50	1.50	0.14	0.60	7.00	1.8	9.00	0–5	15–40	1.00	320	0.40	0.60	pres.
Enoki (Flammulina velutipes)	0.020	0.010	0.010	—	—	—	0.80	37	0.50	0.040	0.20	3.50	—	4.00	0	230	0.50	200	1.80	2.42	—
Maitake (Grifola frondosa)	0.29	0.17	0.12	—	2–8	—	0.70	59	2.00	0.18	0.60	6.00	—	7.00	0–2	30	1.00	350	0.80	0.84	—
King Oyster (P. eryngii)	0.60	0.36	0.24	—	—	—	1.00	90	4.00	0.36	1.00	9.00	1.8	10.0	2–10	40	1.50	500	0.70	0.60	—
Porcini (Boletus edulis)	0.35	0.21	0.14	—	—	—	0.80	95	7.30	0.66	2.40	8.00	—	9.00	0	200	1.20	800	0.35	0.28	—

Ergothioneine — The Longevity Amino Acid

Ergothioneine is a unique sulphur-containing amino acid produced almost exclusively by fungi and mycobacteria. Humans cannot synthesise it — it must be obtained from diet. Research from Penn State (Kalaras et al. 2017, Food Chemistry) found mushrooms contain ergothioneine and glutathione at levels far exceeding all other foods tested.

Research Highlight

A 2020 epidemiological study in Singapore found that individuals who consumed more than two portions of mushrooms per week had a 50% lower risk of mild cognitive impairment compared to those who ate less than one portion per week. Ergothioneine accumulates in mitochondria and the cell nucleus, where it scavenges reactive oxygen species and protects DNA. Low plasma ergothioneine has been correlated with cognitive decline, cardiovascular disease, and reduced life expectancy.

β-Glucans — The Immune Modulators

Beta-glucans are polysaccharides found in mushroom cell walls that activate the innate immune system by binding to specific receptors (Dectin-1) on macrophages and natural killer cells. Oyster mushrooms have the highest β-glucan content (0.79 g/100g FW), followed closely by Indian Oyster (0.70 g) and King Oyster (0.60 g).

Lovastatin — Natural Cholesterol Management

Oyster mushrooms (P. ostreatus) contain lovastatin at concentrations of 50–607 mg/kg dry weight — the same compound found in the pharmaceutical drug Mevacor. As an HMG-CoA reductase inhibitor, it reduces hepatic cholesterol synthesis. Indian Oyster (P. sajor-caju) contains lower but still significant amounts (10–50 mg/kg DW).

Note

Individuals taking prescription statin drugs should inform their physician before significantly increasing oyster mushroom consumption. The additive effect, while generally modest at typical culinary doses, is pharmacologically relevant in sensitive individuals or high-dose preparations.

GABA, Adenosine & Aroma Compounds

Enoki mushrooms contain exceptionally high GABA (γ-aminobutyric acid) at ~230 mg/kg DW — a neurotransmitter associated with relaxation and blood pressure regulation. Porcini contains significant GABA (~200 mg/kg DW). The characteristic “mushroom smell” compound, 1-octen-3-ol, peaks in porcini (800 µg/kg FW) and is responsible for the earthy aroma of all mushroom varieties.

Cooking & Nutrient Retention

USDA research (Haytowitz 2006, Beltsville HNRC) analysed nutrient retention in white button mushrooms after stir-frying and microwaving. The findings are largely encouraging: most nutrients are retained at 100%.

Table 10 — Nutrient Retention in White Button Mushrooms After Cooking (%)

Nutrient	Stir-fried (% retained)	Microwaved (% retained)	Notes
Thiamine (B1)	100%	100%	Fully retained
Riboflavin (B2)	100%	100%	Fully retained
Niacin (B3)	100%	100%	Fully retained
Pantothenic Acid (B5)	100%	100%	Fully retained
Vitamin B6	65%	80%	Heat-sensitive; microwave preferred
Folate (B9)	95%	65%	Stir-frying preferred
Copper	100%	100%	Fully retained
Iron	100%	100%	Fully retained
Potassium	100%	100%	Fully retained
Sodium	80%	85%	Leaching into cooking liquid
Zinc	100%	100%	Fully retained
Selenium	100%	100%	Fully retained

Source: Haytowitz D.B., USDA/ARS Beltsville HNRC, IFT Annual Meeting 2006. Stir-fry: 6 min medium heat, no oil. Microwave: 3 min high power.

Sautéing / Stir-frying: Best overall — 90–100% retention of minerals, B-vitamins, and β-glucans. For Milky and Paddy Straw, medium-high heat 5–7 minutes is optimal.
Microwaving: Excellent mineral retention (95–100%). Better for ergothioneine and glutathione than stir-frying.
Sun-drying: Dramatically boosts Vitamin D2. Works for all varieties including Milky and Paddy Straw. Increases all nutrient concentrations per gram.
Boiling / Soups: Some B-vitamins leach into liquid — use the cooking stock. Good for Paddy Straw curry and dal preparations.
Paddy Straw — cook thoroughly: Always cook for minimum 5–8 minutes to inactivate Volvatoxin. Pan-frying, boiling, or pressure-cooking all achieve this safely.
Milky Mushroom — avoid soaking: Dense texture absorbs water quickly; wipe clean with a damp cloth. Cook on high heat to avoid waterlogging the flesh.

Practical Recommendation

Mushrooms are best cooked briefly at high heat (stir-frying or sautéing) rather than boiling, which leaches water-soluble nutrients. Drying preserves and concentrates most nutrients while dramatically increasing Vitamin D if done in sunlight. Avoid overcooking — most nutrients are fully retained at the 3–6 minute mark.

Evidence-Based Health Benefits

1. Immunity — β-Glucans, Lentinan, Zymosan

β-Glucans activate macrophages, NK cells, and dendritic cells via Dectin-1 receptors. Shiitake’s Lentinan and Paddy Straw’s Zymosan are specific β-glucan complexes studied in oncology settings. Oyster mushrooms (0.79g β-glucans/100g FW) are the most potent immunomodulatory food mushrooms available in India.

2. Cardiovascular — Lovastatin, GABA, Potassium

Oyster mushrooms contain natural lovastatin (50–607 mg/kg DW) — the same compound as pharmaceutical Mevacor, inhibiting HMG-CoA reductase and lowering LDL synthesis. Enoki provides GABA (230 mg/kg) with documented antihypertensive effects. Portobello grilled provides 521mg potassium per serving — 11% DV.

3. Anti-anaemia — Iron in Indian Varieties

Paddy Straw Mushroom (1.43 mg Fe/100g) and Oyster (1.33 mg Fe/100g) are among the best fungal iron sources. Importantly, combining these with their own Vitamin C content (Paddy Straw 20.2mg, Indian Oyster 16.5mg) significantly enhances non-haem iron absorption — a natural co-factor advantage absent in most other plant iron sources.

4. Bone Health — Vitamin D2 + Calcium

UV-treated shiitake provides 600 IU/100g of Vitamin D2. Milky Mushroom provides the highest calcium among Indian cultivated varieties (20mg/100g FW). Together, these make mushrooms practically useful for vegetarians addressing bone health — the only plant-adjacent source covering both Vitamin D and meaningful calcium simultaneously.

5. Diabetes & Blood Sugar

Maitake’s D-Fraction polysaccharide improves insulin sensitivity. Paddy Straw mushroom extracts demonstrated significant α-amylase and α-glucosidase inhibition in vitro, comparable to glibenclamide at 200 mg/kg dose (PMC9219886). All mushrooms have a low glycaemic index (GI ≈ 10–15).

6. Neuroprotection — Ergothioneine

Ergothioneine (found almost exclusively in mushrooms) concentrates in brain, liver, and bone marrow. Low blood ergothioneine correlates with higher dementia rates over 20-year follow-up (Singapore cohort study). Porcini and Shiitake are the richest sources; regular consumption of any mushroom meaningfully raises dietary ergothioneine intake.

Safety Note —

Volvatoxin in Paddy Straw: Raw Paddy Straw Mushroom contains Volvatoxin, a polypeptide that can be cardiotoxic at high isolated doses. Always cook Paddy Straw Mushroom thoroughly before consumption — boiling or sautéing for 5–8 minutes inactivates this compound. This does not apply to other mushroom varieties listed here, and Paddy Straw is completely safe when properly cooked.

ICMR, WHO & USDA Intake Guidelines

Nutrient	Function	RDA (ICMR 2020)	RDA (WHO/USDA)	Best Mushroom Source
Protein	Muscle, enzymes, immunity	0.83g/kg body wt	0.8g/kg	Milky, Cremini, Porcini
Fibre (β-glucans)	Gut health; cholesterol	40g/day	25–30g/day	Oyster, Enoki, Maitake
Vitamin D2	Bone health; calcium absorption	600 IU/day	600 IU/day	Shiitake UV-treated
Vitamin C	Immunity; iron absorption	40mg/day (ICMR)	75–90mg/day	Paddy Straw, Indian Oyster
Riboflavin B2	Energy metabolism	1.4mg/day	1.3mg/day	White Button, Milky, King Oyster
Niacin B3	NAD synthesis; nervous system	16mg/day	16mg/day	Enoki, Maitake, Indian Oyster
Potassium	Blood pressure; heart rhythm	3,500mg/day	4,700mg/day	Portobello grilled, King Oyster
Selenium	Antioxidant; thyroid; immunity	55µg/day	55µg/day	Cremini (40%DV), Paddy Straw (23%DV)
Iron	Haemoglobin; oxygen transport	17mg/day (women)	18mg/day (women)	Paddy Straw, Oyster
Copper	RBC formation; enzyme function	900µg/day	900µg/day	Porcini (57%DV), White Button

ICMR-NIN (2020) Consumption Guidelines

No fixed standalone RDA for mushrooms, but 50–100g cooked, 3–4 times per week is the practical recommendation.
Mushrooms can be included within the 300g/day total vegetable recommendation.
For populations with limited sun exposure: UV-treated mushrooms to meet Vitamin D naturally.
Indian cultivated varieties (Milky, Paddy Straw, Indian Oyster) contribute to rural food security and are preferred for local consumption due to shorter supply chains and better nutrient freshness.
Paddy Straw and Indian Oyster are especially recommended for iron + Vitamin C combination (enhances iron bioavailability from the same meal).

Frequently Asked Questions (FAQs)

Q1. Which Indian mushroom is best for iron deficency?