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Oyster Mushroom

Fungi / Vegetable

Oyster Mushroom

A low-calorie, nutrient-dense edible fungus known for its mild flavor and beneficial beta-glucan content.

Oyster mushrooms are a popular edible fungus recognized by their broad, fan-shaped caps and mild, savory flavor. They are low in calories and carbohydrates while providing beneficial fiber and beta-glucans.

high-volume low-calorie fungi

Typical serving · 100g

Common varieties · pearl oyster, king oyster, blue oyster, golden oyster, pink oyster

85health

Overall context score across nutrition, safety, and diet fit

At a glance

Quick facts

Simple indicators based on nutrition, processing, and diet fit.

Low calorieLow carbLow glycemicWeight lossDiabetes-friendlyGut health

The story

What makes it unique

Oyster mushrooms are fast-digesting, low-energy fungi rich in chitin and beta-glucans, which promote satiety and modulate glycemic response. Their macronutrient profile is dominated by complex carbohydrates and fiber with minimal fat and protein. As a minimally processed whole food, they retain high bioavailability of micronutrients like potassium and B vitamins.

Varieties: pearl oyster · king oyster · blue oyster · golden oyster · pink oyster

#oystermushroom#lowcalorie#lowcarb#betaglucans#guthealth#weightloss#ketovegetable#ediblefungi#plantbased#lowglycemic

Per 100g

Nutrition breakdown

Macro balance and key metrics at a glance.

Energy

33kcal

Density 0.33 kcal/g

Protein

3.3g

Carbs

6.1g

Fat

0.4g

Fiber

2.3g

Sugar

0.6 g

Sodium

5 mg

Potassium

320 mg

Glycemic index

15

Glycemic load

1

Water content

89%

Standout compounds

Nutrient highlights

  • Beta-glucans

    high

    Supports immune function and lowers cholesterol

  • Potassium

    moderate

    Regulates fluid balance and blood pressure

  • Fiber

    moderate

    Promotes digestive regularity and gut health

  • Niacin (Vitamin B3)

    moderate

    Supports energy metabolism and nervous system function

Wellness map

Health scores & processing

Weight loss
90
Satiety
72
Blood sugar
95
Gut health
82
Heart health
80
Fitness
55
Processing
98

NOVA processing scale

1
Min
2
3
4
Ultra

unprocessed · Whole food

Fresh oyster mushrooms are whole, unprocessed agricultural products requiring only washing and cooking.

Diet compatibility

  • Weight loss
  • Muscle gain
  • Diabetes
  • Gut health
  • Low carb
  • High protein
  • Heart health

Relative standing

Food rankings

Qualitative ranks compared to similar whole foods.

  • Satietygood
  • Blood sugarexcellent
  • Nutrient densitygood
  • Fitness fuelmoderate
  • Processing qualityexcellent

Eat with confidence

Food safety profile

Oyster mushrooms are generally very safe due to controlled indoor cultivation. Cooking is recommended to break down chitin and eliminate potential mild gastrointestinal irritants present in raw mushrooms.

90safety

Evidence confidence 90%

  • Pesticideslow
  • Antibioticslow
  • Heavy metalslow
  • Contaminationlow

Watch for

  • soil-borne bacteria
  • spores

Safer choices

Organically grown varieties ensure substrate purity and lack of pesticide residue.

Prep tips

Rinse briefly or wipe with a damp cloth; avoid soaking as they act like sponges. Always cook before eating to ensure digestibility.

Minimal; typically grown in controlled indoor environments on sterilized substrates.

Deep dive

Health analysis

How this food may fit different goals and preparation choices.

  1. Weight loss

    Extremely low energy density allows for high volume eating without excess calories, promoting fullness.

  2. Blood sugar

    Very low glycemic index and load; fiber and beta-glucans slow glucose absorption, preventing spikes.

  3. Fitness & energy

    Not a primary fuel source due to low calories and carbs, but useful for adding volume and micronutrients to meals.

  4. Gut health

    Fiber and chitin support healthy bowel movements and act as prebiotics for beneficial gut bacteria.

  5. Processing quality

    Whole, unprocessed food with no additives or hidden ingredients when purchased fresh.

  6. Food safety

    Safe when cooked; indoor farming methods minimize heavy metal and pesticide exposure risks.

  7. Common mistakes

    Eating them raw, which can cause digestive upset due to chitin, or overcooking them to a rubbery texture.

  8. Best preparation

    Sautéing, roasting, or stir-frying to enhance umami flavor and tenderize the flesh.

Practical guide

Best use cases

When and how this food fits real eating patterns.

  • High-volume low-calorie eating

    Add bulk to meals without adding significant calories to stay full longer.

  • Low-carb recipe base

    Substitute for pasta or rice in keto dishes to reduce carbohydrate intake.

  • Umami flavor enhancer

    Boost savory depth in soups, stews, and stir-fries without extra sodium or fat.

Balance sheet

Pros & cons

Upsides

  • Very low in calories and carbohydrates
  • Rich in immune-supporting beta-glucans
  • Adds significant volume and texture to meals
  • Contains antioxidants like ergothioneine
  • Easy and fast to cook

Trade-offs

  • Not a significant source of protein or fat
  • Must be cooked to ensure digestibility
  • Highly perishable with a short shelf life
  • Can become rubbery if overcooked

Fit check

Who is it for?

Great match

  • weight loss diets
  • diabetic meal plans
  • keto and low-carb diets
  • gut health improvement

Consider alternatives

  • high-protein diets
  • raw food diets
  • calorie-dense bulking phases

Side by side

How it compares

Open the full head-to-head analysis for nutrition, safety, and practical tradeoffs.

  • Oyster Mushroom

    This food

    Oyster Mushroom

    VS95% alike
    Button Mushroom

    Compare with

    Button Mushroom

    Oyster mushrooms offer slightly more protein and fiber than button mushrooms, but both are excellent low-calorie choices.

    Oyster mushrooms provide slightly more protein and fiber than button mushrooms, but both are excellent low-calorie choices.

    Oyster Mushroom vs Button Mushroom
  • Oyster Mushroom

    This food

    Oyster Mushroom

    VS90% alike
    Shiitake Mushroom

    Compare with

    Shiitake Mushroom

    Shiitake mushrooms provide stronger umami flavor and slightly more fiber, while oyster mushrooms are marginally lower in calories.

    Shiitake mushrooms provide stronger umami flavor and slightly more fiber, while oyster mushrooms are marginally lower in calories.

    Oyster Mushroom vs Shiitake Mushroom
  • Oyster Mushroom

    This food

    Oyster Mushroom

    VS85% alike
    Portobello Mushroom

    Compare with

    Portobello Mushroom

    Oyster mushrooms are lower in calories and better for volume eating, whereas portobellos offer a meatier texture for satiety.

    Oyster mushrooms are lower in calories and better for volume eating, whereas portobellos offer a meatier texture for satiety.

    Oyster Mushroom vs Portobello Mushroom
  • Oyster Mushroom

    This food

    Oyster Mushroom

    VS95% alike
    King Oyster Mushroom

    Compare with

    King Oyster Mushroom

    King oyster mushrooms provide a meatier bite and similar low-calorie nutrition to regular oyster mushrooms.

    King oyster mushrooms provide a meatier bite and similar low-calorie nutrition to regular oyster mushrooms.

    Oyster Mushroom vs King Oyster Mushroom
  • Oyster Mushroom

    This food

    Oyster Mushroom

    VS70% alike
    Eggplant

    Compare with

    Eggplant

    Oyster mushrooms are lower in carbohydrates and sugar than eggplant, making them better for blood sugar control.

    Oyster mushrooms are lower in carbohydrates and sugar than eggplant, making them better for blood sugar control.

    Oyster Mushroom vs Eggplant
  • Oyster Mushroom

    This food

    Oyster Mushroom

    VS65% alike
    Zucchini

    Compare with

    Zucchini

    Zucchini is lower in calories, but oyster mushrooms provide more fiber and beta-glucans for gut health and satiety.

    Zucchini is lower in calories, but oyster mushrooms provide more fiber and beta-glucans for gut health and satiety.

    Oyster Mushroom vs Zucchini
  • Oyster Mushroom

    This food

    Oyster Mushroom

    VS50% alike
    Tofu

    Compare with

    Tofu

    Tofu is far superior for protein and muscle building, while oyster mushrooms are better for low-calorie volume eating.

    Tofu is far superior for protein and muscle building, while oyster mushrooms are better for low-calorie volume eating.

    Oyster Mushroom vs Tofu
  • Oyster Mushroom

    This food

    Oyster Mushroom

    VS30% alike
    Chicken Breast

    Compare with

    Chicken Breast

    Chicken breast provides high protein for fitness, whereas oyster mushrooms offer high volume and minimal calories for weight loss.

    Chicken breast provides high protein for fitness, whereas oyster mushrooms offer high volume and minimal calories for weight loss.

    Oyster Mushroom vs Chicken Breast
  • Oyster Mushroom

    This food

    Oyster Mushroom

    VS40% alike
    Lentils

    Compare with

    Lentils

    Lentils provide more protein and sustained energy, but oyster mushrooms are significantly lower in calories and carbohydrates.

    Lentils provide more protein and sustained energy, but oyster mushrooms are significantly lower in calories and carbohydrates.

    Oyster Mushroom vs Lentils
  • Oyster Mushroom

    This food

    Oyster Mushroom

    VS55% alike
    Kale

    Compare with

    Kale

    Kale offers more vitamins K and A, while oyster mushrooms provide unique beta-glucans; both are excellent low-calorie choices.

    Kale offers more vitamins K and A, while oyster mushrooms provide unique beta-glucans; both are excellent low-calorie choices.

    Oyster Mushroom vs Kale

Common questions

FAQ

Answers aligned with how people search for this food.

  • Are oyster mushrooms good for weight loss?

    Yes, they are very low in calories and carbohydrates while providing dietary fiber that increases satiety, making them ideal for weight loss.

  • Can diabetics eat oyster mushrooms?

    Yes, they have a very low glycemic index and contain beta-glucans that help regulate blood sugar levels, making them excellent for diabetic diets.

  • Do oyster mushrooms have protein?

    They contain a small amount of protein (about 3.3g per 100g), but are not considered a high-protein food and should be paired with other protein sources.

  • Can you eat oyster mushrooms raw?

    It is not recommended; raw oyster mushrooms contain chitin which is hard to digest and may cause gastrointestinal upset. Always cook them.

  • What are the health benefits of oyster mushrooms?

    They support immune health, help regulate blood sugar, provide antioxidants, and promote gut health due to their fiber and beta-glucan content.

  • Are oyster mushrooms keto-friendly?

    Yes, they are low in net carbs (about 3.8g per 100g), making them suitable for ketogenic and low-carb diets.

  • How do oyster mushrooms compare to button mushrooms?

    Oyster mushrooms are slightly higher in calories and protein than button mushrooms and offer a more tender texture and milder, sweeter flavor.

Transparency

Data confidence

Estimated confidence for nutrition data, interpretation, safety notes, and comparisons.

95

Nutrition data

90

Health analysis

95

Food safety

90

Comparisons