Mushroom: what it contains and why it matters
Mushroom is an edible fungus. This page lists its nutritional content from published sources and explains which lab parameters it relates to.
Last reviewed: 2026-09-04
Nutritional content of mushroom
Per 100 g edible portion, from published composition data.
| Nutrient | Per 100 g | Source |
|---|---|---|
| Energy | 22 kcal | USDA |
| Protein | 3.09 g | USDA |
| Total lipid (fat) | 0.34 g | USDA |
| Carbohydrate | 3.26 g | USDA |
| Dietary Fiber | 1 g | USDA |
| Potassium | 318 mg | USDA |
| Zinc | 0.52 mg | USDA |
| Phosphorus | 86 mg | USDA |
| Selenium | 9.3 µg | USDA |
| Niacin | 3.6 mg | USDA |
Which lab parameters does mushroom relate to?
Potassium
Potassium helps nerves and muscles work and helps balance the body's fluids [WHO].
Zinc
Zinc supports the immune system, wound healing and normal growth [WHO].
Vegetarian and dietary notes
Mushrooms are the fruiting bodies of fungi and are biologically distinct from plants and animals, fitting standard vegetarian and vegan dietary definitions.
Frequently asked questions
What is the primary macronutrient composition of raw white mushrooms?
Raw white mushrooms consist primarily of water (92.45 g per 100 g), providing 3.09 g of protein, 3.26 g of carbohydrate, and 0.34 g of fat per 100 g [USDA].
How much potassium is present in mushrooms, and what role does it serve?
White mushrooms supply 318 mg of potassium per 100 g [USDA]. Potassium functions as a major intracellular cation involved in membrane potential maintenance, fluid balance, and muscle contraction.
What is the zinc content of raw mushrooms?
Raw white mushrooms contain 0.52 mg of zinc per 100 g [USDA]. Zinc acts as a catalytic and structural cofactor for numerous enzymes involved in protein synthesis and cellular division.
Which B-complex vitamins are found in white mushrooms?
Raw white mushrooms contain 3.6 mg of niacin and 0.4 mg of riboflavin per 100 g [USDA], both of which participate as coenzymes in mitochondrial energy metabolism.
How do mushrooms synthesize vitamin D?
Mushrooms contain ergosterol, a fungal sterol that undergoes photochemical conversion to ergocalciferol (vitamin D2) upon exposure to ultraviolet light.
Sources
- USDA — USDA FoodData Central, Agricultural Research Service. https://fdc.nal.usda.gov/
- WHO — World Health Organization — nutrition fact sheets. https://www.who.int/