Agaricus Bisporus Nutrition: White Button Mushrooms

    Agaricus bisporus is the species behind familiar white button or champignon mushrooms, as well as brown crimini and portabella forms. For plain raw white mushrooms, USDA's reference lists 22 kcal, 3.09 g of protein and 1 g of fiber per 100 g edible portion. They also contribute riboflavin, niacin, copper, selenium and potassium. Their value in a meal is a combination of those contributions and the flavor and texture they bring.

    Fresh weight and ultraviolet treatment deserve particular care. Fresh mushrooms are mostly water, so a large protein percentage quoted on a dry basis should not be read as grams of protein in the fresh food. Vitamin D also varies with the product: ordinary white mushrooms and mushrooms deliberately exposed to ultraviolet light have separate composition records. A white cap is no indication of its vitamin D content.

    For an everyday meal, use mushrooms as a flavorful ingredient and count their actual portion, rather than treating them as a protein-equivalent replacement for another food. For a frozen product, identify the cut, ingredients and preparation state before choosing nutrition data. Raw reference values describe a food composition basis; they are neither instructions to eat a frozen ingredient uncooked nor proof that a finished mushroom dish has the same nutrition.

Which mushroom does the name describe?

    White button, champignon, crimini and portabella are useful names to recognize, but "mushroom" on its own is much broader. USDA researchers identify white button, crimini and portabella as Agaricus bisporus in their work on mushroom vitamin D composition. The numbers used below specifically describe raw white mushrooms. Sharing a species name does not make every color, maturity stage and prepared product nutritionally identical.

    Shiitake is a different mushroom. Its separate shiitake nutrition reference is relevant when that is the ingredient in your recipe, but it should not supply the missing figures for a white-button mushroom calculation. The same applies to a mixed-mushroom bag: identify the components and their proportions instead of choosing the table for the most visible cap in a photograph.

    Food form comes next. Plain fresh mushrooms, plain frozen slices, canned mushrooms in liquid and dried mushroom powder have different descriptions for a reason. Some contain added ingredients; others have lost or gained water during preparation. Write the full ingredient name on a recipe sheet before entering the numbers. "White mushrooms, raw" is already more useful than an unlabeled column headed "mushroom nutrients."

    This is also a practical boundary for product photographs. They can show whole caps, slices and handling arrangements, but they cannot establish nutrient composition or treatment history. The images here are XMSD mushroom product and process views, not identification instructions for gathered mushrooms, batch analyses or evidence of current availability. A scientific name on a commercial description belongs with the product records.

Nutrition per 100 g of raw white mushrooms

    The following values come from USDA FoodData Central record 169251, "Mushrooms, white, raw," in the SR Legacy dataset. They apply to 100 g edible raw mushroom. Nothing else is included: no frying oil, butter, cream, broth, salt or breading. Keep that basis when using the table for an initial recipe estimate.

    The water value helps explain the modest energy figure and the difference between fresh and dry-weight numbers. Mushrooms still contribute the nutrients shown in the table. To estimate a dish containing oil or cheese, include those additions too. They can change the result substantially even when the mushrooms occupy most of the plate.

    A cup needs a description too. This USDA record assigns 70 g to a cup of pieces or slices and 96 g to a cup of whole mushrooms. At the same reference composition, those amounts provide about 15 and 21 kcal respectively. Neither cup is a universal weighing standard: cut thickness, cap size and how the cup is filled can change its actual contents. Use grams for a repeatable recipe.

    The record is a historical reference, not a test of today's delivery. FoodData Central also contains newer white-button data with different sampled values. Keep a chosen record's values together so another person can reproduce the calculation. For a product label or a claim that depends on a minimum nutrient level, use information that properly represents the ingredient and finished product being sold.

Protein: read fresh weight before the percentage

    The raw reference provides about 3 g protein in 100 g of mushrooms. That is a contribution, but the phrase "high protein" can create a very different expectation if it is used without a portion or basis. A serving used as a topping may contain much less than 100 g. Work out its gram contribution before deciding what role it plays in the meal.

    A dry-matter result excludes water mathematically. A fresh-weight result includes the food's water. Since the reference mushroom is 92.4 g water per 100 g, these two denominators are very different. A protein percentage in the tens on a dry basis can coexist with only a few grams per 100 g fresh food. Reading the larger percentage as fresh-food protein would substantially overstate the portion's contribution.

    Dried powder adds another distinction. It is a real product that may retain some moisture, rather than the abstract water-free basis used in a calculation. Ask whether a report describes fresh material, the powder as supplied or dry matter. Also check whether the product contains a carrier or other ingredient. Rehydration changes the weight basis again, so the nutrition in a weighed spoonful of powder is not the nutrition in the same weight of rehydrated mushroom.

    We would separate the mushroom's culinary role from the meal's protein plan. Slices may give a filling its recognizable mushroom bite, while finely chopped mushrooms may distribute flavor through a sauce. If that change replaces another ingredient, calculate the revised recipe instead of assuming equal nutrition because the cooked texture seems substantial. Keep an appropriate protein-containing component in the meal and evaluate the complete portion.

B vitamins and minerals in a meal

    Riboflavin, also called vitamin B2, helps normal cell function and the body's use of food for energy, according to NIH guidance. The raw-white-mushroom reference contains 0.402 mg per 100 g. Mushrooms can therefore contribute to dietary intake, alongside other foods. This is a normal nutrient role, not evidence that a mushroom serving produces an energy boost or treats fatigue.

    Selenium is needed for normal thyroid function and DNA production, among other roles described by NIH. The table's 9.3 micrograms per 100 g is a food-composition quantity, not a treatment dose. Read the microgram unit carefully: it is much smaller than a milligram. Increasing a portion to pursue a medical effect is a different decision from using mushrooms in a meal.

    Niacin, copper and potassium also appear in the reference. A varied meal can receive small or larger contributions from several ingredients, and the portion determines how much comes from mushrooms. There is no useful single multiplier for saying that mushrooms are several times "more nutritious" than all fruits or vegetables. Different foods bring different amounts of different nutrients, so compare the nutrient that actually matters to the menu rather than ranking foods as a whole.

    Keep claims about cancer, blood pressure or removing heavy metals separate from an ordinary food description. Neither a composition table nor a normal nutrient function establishes those treatment outcomes. For a diagnosed condition or a restricted diet, the relevant professional can assess the complete eating pattern. For normal recipe planning, the useful step is simpler: choose a suitable portion, add the other ingredients and calculate the dish you will actually serve.

Vitamin D depends on ultraviolet treatment

    Ordinary mushrooms should not automatically be described as a dependable high-vitamin-D food. The raw white reference used here lists 0.2 micrograms of vitamin D per 100 g. USDA's separate record 169376, explicitly named "Mushroom, white, exposed to ultraviolet light, raw," lists 26.2 micrograms per 100 g. The treatment words are a crucial part of that second food description.

    USDA researchers explain that ultraviolet exposure can convert mushroom ergosterol into vitamin D2. Their analyses of mushroom types and sampled composites also show why one number should not be assigned to every mushroom. Exposure conditions and the specific product matter. This is a composition and processing distinction; the higher database value is not a guaranteed result from any particular exposure routine or a specification for an XMSD product.

    NIH describes vitamin D's role in calcium absorption and notes that some mushrooms are exposed to ultraviolet light to increase their content. If vitamin D is a reason for choosing a retail pack, read its actual nutrition declaration. If you are developing a product around that nutrient, obtain the treatment description and representative composition information for the proposed ingredient, then assess the finished product and its serving size.

    Color, cap diameter and an IQF description will not resolve the vitamin D question. Nor is a photograph of a mushroom beside a measuring tool a nutrient result. For ordinary cooking with no vitamin D positioning, choose the mushroom for the dish and avoid attaching a special nutrient promise. If a healthcare professional has advised treatment for deficiency, an assumed mushroom value is not a replacement for that plan.

Mushroom measurement context only; no size reading, vitamin D treatment or nutrient value is established by this image.

Example: 85 g of mushrooms in an omelet

    Suppose a home cook or menu developer plans an omelet containing 85 g of raw white mushrooms. This is a hypothetical ingredient calculation, not a recommended serving size or a measured batch result. Using the raw table, the portion factor is 85 ÷ 100 = 0.85.

    The mushrooms contribute an estimated 22 × 0.85 = 18.7 kcal and 3.09 × 0.85 = 2.6265 g protein. Riboflavin is 0.402 × 0.85 = 0.3417 mg. For a practical discussion, that is about 19 kcal, 2.6 g protein and 0.34 mg riboflavin from the raw mushroom input. The extra arithmetic digits do not make the ingredients more uniform or the estimate more accurate.

    Now add the eggs and any oil, butter, milk, cheese or filling ingredients separately. The mushroom-only figure is not the omelet's calorie or protein total. If the recipe is divided into two servings, distribute the complete batch calculation using the actual serving allocation, rather than counting 85 g of mushroom for each plate when only 85 g entered the pan.

    Cooking changes the amount of water and the final weight. A smaller pile of cooked mushrooms is not automatically evidence that the same proportion of every nutrient has disappeared. Conversely, a raw-input calculation alone is insufficient for a precise declaration of all retained vitamins after cooking. Use a suitable cooked-food basis or a justified recipe method when that precision is required.

    The working decision is to measure the raw addition and record the finished dish, with every ingredient included. If the kitchen switches to frozen or already prepared slices, update the ingredient description before reusing the worksheet. The same 85 g figure may then represent a different product state.

Frozen cuts have different jobs in the recipe

    XMSD's frozen champignon product information describes whole, sliced, diced and quartered formats, with blanching status selected for the application. These are useful distinctions for a recipe trial. They are not interchangeable simply because the ingredient species is the same, and blanching should not be treated as a ready-to-eat declaration.

    For a pizza topping, slices need to spread over the base and remain recognizable after preparation. For a sauce, small pieces may be more useful because they distribute through each spoonful. A soup may retain released liquid as part of the recipe, while a topping preparation may remove it. Record that choice because it changes the material reaching the finished dish.

    We would run the proposed cut through the actual preparation method before comparing packs. Use the same starting quantity, appliance loading, draining procedure and point of weighing. Otherwise, a difference attributed to the mushrooms may come from one sample sitting in a sieve longer or being cooked in a more crowded pan. Assess surface wetness and eating texture alongside the scale reading.

    For a food-processing application, carry those trial conditions into the product discussion. Specify whether a reported yield means cooked solids, solids with liquid or the entire finished sauce. That short definition prevents a seemingly favorable percentage from referring to material the recipe will discard. It also keeps a texture trial from being mistaken for a nutrition analysis.

XMSD mushroom handling context, not a release record for a particular lot or evidence of current availability.

Example: enough prepared slices for 250 pizzas

    A hypothetical pizzeria needs 20 g of prepared mushroom slices on each of 250 pizzas, giving a total requirement of 5,000 g, or 5 kg. It compares two frozen-slice samples using the same preparation and draining method. Suppose each starts at 1 kg, with sample A producing 700 g and sample B producing 800 g of usable prepared slices. These yields are illustrative, not XMSD specifications.

    The measured usable yields would be 70% and 80%. To obtain 5 kg under those trial conditions, the corresponding starting quantities are 5 ÷ 0.70 = approximately 7.14 kg and 5 ÷ 0.80 = 6.25 kg. These are calculated input requirements before any separate production allowance. They are not universal purchase quantities for frozen mushrooms.

    Next, compare the slices on the baked pizza: coverage, recognizable shape, surface moisture and the eating texture all matter. A higher drained yield is useful only if that material performs as intended. Equally, a lower pack price may be less attractive when more input is needed for the same acceptable topping portion. Compare cost per usable portion using the actual offer and observed trial result.

    Keep the nutrition review separate from this yield comparison. A 70% usable weight result is not a 70% retention factor for protein, riboflavin or vitamin D. It records mass under a defined preparation, including whatever liquid or solids were discarded. If the selected mushroom or preparation changes, reassess both the serving calculation and the product's nutrition basis.

    Approve the cut and preparation together, keeping the trial method with the chosen product description. Repeat the assessment when the supplied form or preparation changes. A photo of a tidy frozen slice can start the discussion; the topping on the finished pizza decides whether that cut does the required job.

Mushroom measurement context only; no size reading, vitamin D treatment or nutrient value is established by this image.

Keep preparation instructions with the ingredient

    For household storage, FDA advises a freezer at 0°F (-18°C) and a refrigerator at or below 40°F (4°C). Its guidance also explains that freezing stops most bacterial growth without killing most bacteria, and that commercially frozen foods should be prepared according to their package cooking instructions. A frozen state is therefore not, by itself, permission for uncooked use.

    Follow the identified product's storage and preparation directions rather than borrowing a cooking time from a different cut or dish. Whole mushrooms, thin slices and mushrooms already included in a sauce present different preparation conditions. For commercial production, use the relevant controlled process; a small kitchen trial establishes application performance, not the safety of every larger production batch.

    Appearance checks have a limited but useful role. XMSD's sorting and inspection equipment information provides context for discussing the controls used for a proposed product. Ask how those controls are recorded and connected to its lot. An inspection view shows an activity or arrangement, not the release status of a particular delivery or its nutritional composition.

XMSD mushroom handling context, not a release record for a particular lot or evidence of current availability.

    The inner-pack and carton options matter when a kitchen uses only part of the outer pack. Retain product identity, lot details and preparation instructions with the remaining ingredient after the carton is opened. A plain inner bag without that information makes it harder to distinguish similar-looking cuts or prepared forms later in the shift.

    When selecting Agaricus bisporus, start with its real strengths: a useful cooking ingredient with a modest protein contribution, B vitamins and minerals. Weigh the portion, read vitamin D on the actual product basis, and include the rest of the recipe. Those habits give a more reliable answer than a dramatic percentage or a list of medicinal promises.

References

• USDA FoodData Central: Mushrooms, white, raw, SR Legacy record 169251
• USDA FoodData Central: Mushroom, white, exposed to ultraviolet light, raw, SR Legacy record 169376
• Phillips et al. (2011), USDA ARS: Vitamin D and sterol composition of ten types of mushrooms from retail suppliers in the United States
• NIH Office of Dietary Supplements: Riboflavin
• NIH Office of Dietary Supplements: Selenium
• NIH Office of Dietary Supplements: Vitamin D
• FDA: Are You Storing Food Safely?
• XMSD operational perspective on mushroom cuts, recipe trials, usable yield and packing records.