Shellfish
King Crab
A premium, low-calorie shellfish packed with protein and essential marine minerals.
A large crustacean prized for its sweet, tender leg meat, commonly harvested from cold ocean waters as a premium seafood delicacy.
protein-dense shellfish
Typical serving · 85g
Common varieties · Red King Crab, Blue King Crab, Golden King Crab, Scarlet King Crab
Overall context score across nutrition, safety, and diet fit
At a glance
Quick facts
Simple indicators based on nutrition, processing, and diet fit.
The story
What makes it unique
King crab is a fast-digesting, high-protein, zero-carbohydrate marine food. It provides high satiety due to its dense protein content and is exceptionally rich in micronutrients like zinc, selenium, and vitamin B12, though it carries a naturally high sodium content.
Varieties: Red King Crab · Blue King Crab · Golden King Crab · Scarlet King Crab
Per 100g
Nutrition breakdown
Macro balance and key metrics at a glance.
Energy
Density 0.97 kcal/g
Protein
Carbs
Fat
Fiber
Sugar
0 g
Sodium
1072 mg
Potassium
241 mg
Glycemic index
0
Glycemic load
0
Water content
79%
Standout compounds
Nutrient highlights
Vitamin B12
highSupports nerve function and red blood cell formation
Zinc
highBoosts immune system and aids wound healing
Selenium
highProvides antioxidant protection for cells
Protein
highEssential for muscle growth and repair
Sodium
highRegulates fluid balance but can raise blood pressure in excess
Wellness map
Health scores & processing
NOVA processing scale
Minimally processed · Whole food
Fresh or frozen king crab legs are minimally processed, typically just cooked and flash-frozen at sea, though some commercial products are pre-brined which adds sodium.
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 fuelexcellent
- Processing qualityexcellent
Eat with confidence
Food safety profile
King crab is generally safe but carries a moderate risk of heavy metal accumulation (specifically cadmium in the brown meat) and microbial contamination if improperly handled. Shellfish allergies are a primary concern for sensitive individuals.
Evidence confidence 85%
- Pesticideslow
- Antibioticslow
- Heavy metalsmoderate
- Contaminationmoderate
Watch for
- Cadmium
- Vibrio parahaemolyticus
- Norovirus
- Shellfish allergens
Safer choices
Sourcing from well-regulated fisheries, such as Alaskan waters, and avoiding the brown meat (tomalley) reduces heavy metal exposure.
Prep tips
Avoid if shellfish allergic. Keep strictly refrigerated and cook thoroughly to mitigate bacterial and viral risks. Discard any crab with an ammonia odor.
Monitored for marine biotoxins and heavy metals; strict cold-chain requirements are mandated to prevent histamine formation and bacterial growth.
Deep dive
Health analysis
How this food may fit different goals and preparation choices.
Weight loss
High protein and low calories promote fullness and support lean mass preservation during calorie deficits.
Blood sugar
Zero carbohydrates result in no glycemic impact, making it highly blood sugar friendly.
Fitness & energy
Excellent post-workout recovery food due to high protein and zinc, though it lacks fast carbohydrates for glycogen replenishment.
Gut health
Lacks dietary fiber, so it does not directly support gut motility or microbiome diversity.
Processing quality
Typically sold as minimally processed frozen legs, though some pre-brined versions add excess sodium.
Food safety
Primary risks are shellfish allergy, histamine toxicity from spoilage, and cadmium accumulation in brown meat.
Common mistakes
Drowning the meat in melted butter drastically increases calorie and saturated fat intake, negating its low-calorie profile.
Best preparation
Steaming or boiling to heat through without adding fat; serving with a light squeeze of lemon instead of drawn butter.
Practical guide
Best use cases
When and how this food fits real eating patterns.
Low-carb seafood dinner
Fits perfectly into ketogenic and low-carb meal plans due to its zero carbohydrate content.
High-protein weight loss meals
Provides maximum protein and satiety for very few calories, aiding weight management.
Post-workout recovery
Rich in amino acids and zinc to support muscle tissue repair and immune function after exercise.
Balance sheet
Pros & cons
Upsides
- Very high in protein
- Zero carbohydrates
- Rich in vitamin B12 and zinc
- Low in calories
- Contains beneficial omega-3 fatty acids
Trade-offs
- Naturally very high in sodium
- Expensive compared to other protein sources
- High risk for severe shellfish allergies
- Contains no dietary fiber
- Often served with high-calorie butter
Fit check
Who is it for?
Great match
- keto and low-carb diets
- high-protein weight loss
- post-workout muscle recovery
- vitamin B12 supplementation
Consider alternatives
- low-sodium diets
- shellfish allergy sufferers
- strict budget meal planning
Side by side
How it compares
Open the full head-to-head analysis for nutrition, safety, and practical tradeoffs.
This food
King Crab
VS95% alike
Compare with
Snow Crab
King crab is larger, sweeter, and higher in protein, while snow crab is leaner, lower in sodium, and more affordable.
King crab has larger legs and sweeter meat, while snow crab is lower in sodium and more budget-friendly.
This food
King Crab
VS90% alike
Compare with
Lobster
Lobster is slightly higher in protein and lower in sodium, but king crab offers a sweeter taste and more zinc.
Lobster is lower in sodium and higher in protein, but king crab provides more zinc and a sweeter flavor.
This food
King Crab
VS85% alike
Compare with
Shrimp
Shrimp is lower in sodium and calories, making it better for weight loss, while king crab is richer in zinc and vitamin B12.
Shrimp is lower in calories and sodium for weight loss, while king crab offers more zinc and B12.
This food
King Crab
VS85% alike
Compare with
Dungeness Crab
Dungeness crab is lower in sodium and more affordable, but king crab yields more meat per leg and has a more delicate texture.
Dungeness crab is lower in sodium, but king crab provides larger pieces of sweeter, more tender meat.
This food
King Crab
VS70% alike
Compare with
Salmon
Salmon is much higher in omega-3 fats and lower in sodium, while king crab is lower in calories and nearly fat-free.
Salmon provides far more omega-3s and healthy fats, while king crab is lower in calories and fat-free.
This food
King Crab
VS75% alike
Compare with
Scallops
Scallops are lower in sodium and cholesterol, making them more heart-friendly, while king crab is richer in zinc.
Scallops are much lower in sodium and better for heart health, while king crab is higher in zinc and vitamin B12.
This food
King Crab
VS60% alike
Compare with
Chicken Breast
Chicken breast is lower in sodium, cheaper, and higher in protein, but king crab provides far more vitamin B12 and selenium.
Chicken breast is higher in protein and lower in sodium, but king crab offers vastly more vitamin B12 and zinc.
This food
King Crab
VS55% alike
Compare with
Steak
Steak offers more iron and fat for satiety, while king crab is much lower in calories and saturated fat.
King crab is much lower in calories and saturated fat than steak, but steak provides more iron and sustained energy.
This food
King Crab
VS70% alike
Compare with
Tuna
Tuna is higher in protein and lower in sodium, but king crab has significantly less mercury risk and more zinc.
Tuna is higher in protein and lower in sodium, but king crab has lower mercury levels and more zinc.
This food
King Crab
VS65% alike
Compare with
Oysters
Oysters are lower in sodium and extremely high in zinc, while king crab offers more protein and a meatier texture.
Oysters are vastly higher in zinc and lower in sodium, while king crab provides more protein and a heartier meal.
Common questions
FAQ
Answers aligned with how people search for this food.
Is king crab good for weight loss?
Yes, king crab is excellent for weight loss. It is very low in calories and high in protein, which increases satiety and helps maintain muscle mass while in a calorie deficit.
How many calories are in king crab legs?
There are approximately 97 calories in 100 grams of king crab meat, making it a highly low-calorie protein source.
Is king crab high in mercury?
No, king crab generally has low mercury levels compared to large predatory fish, making it a safer seafood choice for regular consumption.
Can diabetics eat king crab?
Yes, king crab contains zero carbohydrates and will not spike blood sugar. However, diabetics should be mindful of the high sodium content.
Why is king crab so high in sodium?
King crab naturally accumulates sodium from its marine environment. Additionally, commercial processing often involves brining or saltwater boiling, which further increases the sodium content.
Is king crab healthy to eat?
Yes, it provides high-quality protein, vitamin B12, zinc, and selenium. It is healthy in moderation, though its high sodium level means it should be balanced with lower-sodium foods.
What is the difference between red and golden king crab?
Red king crab is larger, sweeter, and more prized for its tender meat, while golden king crab is smaller, more affordable, and has a slightly less rich flavor profile.
Does king crab have omega-3s?
Yes, king crab contains beneficial omega-3 fatty acids, though in lower amounts compared to fattier fish like salmon or mackerel.
Transparency
Data confidence
Estimated confidence for nutrition data, interpretation, safety notes, and comparisons.
Nutrition data
Health analysis
Food safety
Comparisons