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A flat white mushroom has a broad, smooth, off-white cap, a short pale stem and fine cream-coloured gills visible beneath the cap.
●Low GI
★Natural

Flat White Mushroom Calories

Low calorie, source of fiber, rich in B vitamins and minerals

In season: Spring · Summer · Autumn

CALORIES · 100 G

22kcal

GI

15low

POTASSIUM · 100 G

320mg

FIBER · 100 G

1.2g

Quick answer

1 piece (medium) of Flat White Mushroom (40 g) has 9 calories. That works out to 22 calories per 100 g. It contains 1.3 g of carbs, 1 g of protein, 0.1 g of fat and 0.5 g of fiber. Its 6.4 µg of Biotin covers 21% of the Daily Value. Its glycemic index is 15 (low), so it raises blood sugar slowly.

Flat White Mushroom Nutrition Facts

Selected: 1 piece (medium) · 40 g

9

KCAL / 40G

Carbs

1.3g

· 0% DV

Protein

1g

· 2% DV

Fat

0.1g

· 0% DV

Fiber

0.5g

· 2% DV

DV is the share of the daily value covered, on a 2,000 kcal reference diet.

Calories come from: Carbs 51% · Protein 40% · Fat 9%

Flat White Mushroom nutrition facts table · 1 piece (medium) (40 g)

NutrientAmount% DV
Calories9 kcal
Total fat0.1 g0%
Saturated fat0.02 g0%
Trans fat0 g
Sodium2.4 mg0%
Total carbohydrate1.3 g0%
Fiber0.5 g2%
Protein1 g2%

Calories: Calories measure energy. Average daily need is 2,000 kcal. Excess calories are stored as fat, too few cause weight loss.

Carbs: Your body's primary energy source. The brain runs exclusively on carbs. Daily need: 275g.

Protein: Essential for muscle repair and cell growth. Daily need: 50g. Keeps you full and boosts metabolism.

Fat: Needed for hormone production and vitamin absorption. Daily need: 78g. Limit saturated fats, choose unsaturated.

Fiber: Critical for digestive health and satiety. Daily need: 28g. Stabilizes blood sugar, lowers cholesterol.

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How Many Calories in 1 Medium Flat White Mushroom?

ServingAmountCalories
1 piece (medium)40 g9 kcal
1 piece (small)25 g6 kcal
1 cup (small)50 g11 kcal
1 piece (large)60 g13 kcal
1 cup (chopped)70 g15 kcal
2 piece (medium)80 g18 kcal
100 g100 g22 kcal
1 cup (small)100 g22 kcal
1 serving (large)120 g26 kcal
1 cup (large)150 g33 kcal

Calculated from 22 calories per 100 g.

Frequently Asked Questions About Flat White Mushroom

What is a flat white mushroom?

A flat white mushroom usually refers to a white cultivated mushroom with a flatter or more open cap, rather than a universally standardized separate species. The exact meaning can vary by seller, so its size and cap shape may differ.

How do you cook flat white mushrooms?

Cook flat white mushrooms in a hot pan with a little oil, spreading them out so they brown instead of steam. Their broad caps work well grilled, roasted, or sautéed; add salt near the end to limit excess moisture.

Can you eat flat white mushrooms raw?

Yes, fresh flat white mushrooms can be eaten raw, for example thinly sliced in a salad. Cooking softens them and brings out a deeper flavor. Clean them before eating and avoid any that are slimy or smell unpleasant.

Are flat white mushrooms the same as white button mushrooms?

They can be the same cultivated white mushroom, but “flat white” often describes a flatter or more open cap than the familiar closed button stage. The term is not used consistently everywhere, so the name alone does not guarantee a distinct variety.

Do you peel flat white mushrooms before cooking?

No, you generally do not need to peel flat white mushrooms; their thin skin is edible. Wipe away dirt and trim any dry or damaged areas. Peeling is usually unnecessary and can remove edible mushroom flesh.

How do you clean flat white mushrooms without making them soggy?

Wipe flat white mushrooms with a damp cloth or rinse them briefly under running water, then dry them well. Do not leave them soaking: they can hold water and are more likely to steam rather than brown in the pan.

Can you eat the stems of flat white mushrooms?

Yes, flat white mushroom stems are edible. Trim off the dry or dirty ends; if the stems feel firmer than the caps, chop them smaller or give them a little extra cooking time.

Why do flat white mushrooms release so much water when cooked?

Flat white mushrooms release moisture when the pan is crowded or not hot enough. Cook them in batches in a wide, hot pan so the liquid can evaporate and the caps can brown.

How should you store flat white mushrooms in the fridge?

Keep flat white mushrooms unwashed in a breathable paper bag in the refrigerator, and clean them just before use. Trapped moisture can make them deteriorate faster; discard mushrooms that become slimy or develop an unpleasant smell.

Can you freeze flat white mushrooms?

Yes, but sautéing flat white mushrooms before freezing usually gives a better texture than freezing them raw. Cool them first, pack them airtight, and expect thawed mushrooms to be softer than fresh ones.

Flat White Mushroom Vitamins & Minerals

Vitamins

Biotin

6.4µg · 21% DV

B2

0.14mg · 11% DV

B5

0.48mg · 10% DV

B3

1.4mg · 9% DV

Minerals

Copper

0.12mg · 13% DV

Phosphorus

44mg · 6% DV

Selenium

3.2µg · 6% DV

Potassium ⭐

128mg · 4% DV

Sodium

2.4mg · 0% DV

Flat White Mushroom Glycemic Index

GLYCEMIC INDEX

15
Low
0 Low5570100

GLYCEMIC LOAD

0.4
Low

Accounts for portion size — a more realistic measure than GI alone.

How to Burn Off Flat White Mushroom

To burn the 9 calories in 1 piece (medium) (40 g):

🚶

2min

Walking (5 km/h)

🏃

1min

Running (8 km/h)

🚴

1min

Cycling

🏊

1min

Swimming

Times are calculated with the MET equation for a 70 kg adult. Actual burn varies with your weight, age and pace.

What is Flat White Mushroom?

Flat White Mushroom is a white mushroom variety with a broad, relatively flat cap and a mild flavour. Its firm, fleshy texture makes it easy to use on its own or as part of a larger dish.

You can slice and sauté it, roast or grill it, fold it into an omelettes and pasta, or serve it raw in a salad. In many kitchens, mushrooms are used to add savoury depth to vegetables, grains and meat-free meals. Flat White Mushroom is low in calories and provides fibre, B vitamins and minerals; it has 22 calories per 100 g. For a lighter meal, cook it with plenty of vegetables and use oil sparingly.

How Nutritious Is Flat White Mushroom?

Nutrient density

High

70/ 100

How many vitamins, minerals and how much fiber this food carries per calorie. A high score means a lot of nutrition for few calories.

Satiety score

Medium

48/ 100

An EatBetter score computed from fiber, protein and calorie density. A high score means staying full longer on the same calories.

Both scores are calculated per 100 g and do not change with the selected portion. The satiety score is EatBetter's own calculation, not a clinical measure.

Is Flat White Mushroom Processed?

NOVA 1

Unprocessed

1. Unprocessed

2. Minimally Processed

3. Processed

4. Ultra-Processed

NOVA classifies foods into 4 groups by industrial processing. NOVA 1 (unprocessed) is the healthiest.

Does Flat White Mushroom Contain Allergens?

No known major allergens

Gluten free
Dairy free
Eggs free
Peanuts free
Tree nuts free
Fish free
Soy free
Sesame free

Which Diets Is Flat White Mushroom Good For?

Vegan

✓ Suitable

Vegetarian

✓ Suitable

Gluten-Free

✓ Suitable

Dairy-Free

— Not suitable

Mediterranean

✓ Suitable

Paleo

✓ Suitable

Whole30

— Not suitable

DASH

— Not suitable

Keto

— Not suitable

Low FODMAP

— Not suitable

Flat White Mushroom Fat Profile

SATURATED

0.02g

MONOUNSATURATED

0.01g

POLYUNSATURATED

0.02g

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Nutrition data compiled from USDA FoodData Central and scientific sources.