Snow crab is one of the most nutritious shellfish you can eat. A 100-gram serving (about 3.5 ounces) delivers 18.5 grams of protein for just 90 calories, with barely a gram of fat and zero carbohydrates. It’s packed with B12, selenium, zinc, and omega-3 fatty acids, and it carries very low mercury levels. For most people, snow crab is an excellent addition to a healthy diet.
Protein and Calorie Breakdown
Snow crab is remarkably lean. According to NOAA Fisheries data, a 100-gram raw serving contains 90 calories, 18.5 grams of protein, 1.18 grams of total fat (of which only 0.14 grams is saturated), and no carbohydrates or sugar. That protein-to-calorie ratio puts it on par with chicken breast, making it one of the most efficient protein sources available. If you’re managing your weight or trying to increase protein intake without extra calories, snow crab fits naturally into that goal.
Key Vitamins and Minerals
The standout nutrients in snow crab are vitamin B12, selenium, and zinc. B12 is essential for nerve function and red blood cell production, and many people, especially older adults, don’t get enough of it. Selenium supports thyroid function and acts as an antioxidant, while zinc plays a role in immune defense and wound healing. Snow crab is rich in all three, along with folate, iron, and niacin.
Omega-3s for Heart Health
Snow crab provides between 200 and 500 milligrams of the omega-3 fatty acids EPA and DHA per 3-ounce cooked serving, according to the National Lipid Association. These are the same heart-protective fats found in salmon and sardines, though in somewhat smaller amounts. Eating seafood with these fats is associated with a lower risk of heart attack, stroke, and death from heart disease. Snow crab won’t match a fatty fish like mackerel for omega-3 content, but it contributes meaningful amounts, especially if you eat it regularly as part of a varied seafood diet.
Mercury Levels Are Very Low
One of the biggest concerns people have about seafood is mercury, and snow crab performs well here. FDA testing data from 1990 to 2012 shows crab (including snow, king, and blue varieties) has a mean mercury concentration of just 0.065 parts per million. For comparison, swordfish averages close to 1 ppm and tuna ranges from 0.12 to 0.69 ppm depending on the species. Snow crab is firmly in the low-mercury category, making it a safe choice for frequent consumption, including for pregnant women and young children following standard seafood guidelines.
Considerations for Gout
Snow crab contains about 136 milligrams of purines per 100 grams. Purines are compounds your body breaks down into uric acid, and excess uric acid can trigger gout flares. That purine level is moderate, not as high as organ meats or anchovies, but not negligible either. Most well-balanced diets land around 300 to 400 milligrams of total purines per day, so a single serving of snow crab could account for a third or more of that daily intake. If you have gout or elevated uric acid levels, you don’t necessarily have to avoid snow crab entirely, but portion size matters.
How You Prepare It Matters
The nutritional profile of snow crab can shift dramatically depending on how you eat it. Steamed or boiled crab legs keep the calorie count low and preserve the natural nutrient balance. The problems start with what you dip them in. A quarter cup of melted butter adds roughly 400 calories and 28 grams of saturated fat to what was otherwise one of the leanest proteins on your plate. If you want to keep things light, try lemon juice, a small amount of garlic butter, or a vinegar-based cocktail sauce instead.
Breading and deep-frying crab meat changes the equation even more, adding refined carbohydrates and inflammatory oils. The closer you stay to simple preparation methods, the more of the original nutritional benefits you retain.
Shellfish Allergy Risks
Snow crab is one of the more potent shellfish allergens. The primary trigger is a protein called tropomyosin, which is present in virtually all crustaceans and mollusks. More than 60% of shellfish-allergic patients react to this protein, and reactions can be severe, including anaphylaxis. Symptoms typically appear within two hours, though late reactions have been documented up to eight hours after eating snow crab specifically.
Cross-reactivity is common. Tropomyosin in crab shares 95 to 100% of its amino acid structure with the same protein in shrimp and lobster, so an allergy to one crustacean usually means reacting to others. There’s also a less well-known crossover: people sensitized to dust mites or cockroaches sometimes react to shellfish tropomyosin as well. If you’ve never eaten snow crab before and have known allergies to other shellfish or a history of dust mite sensitivity, that’s worth being aware of before your first serving.