Oyster Calories and Nutrition: A High-Protein Low-Calorie Food

Oysters sit near the top of the most nutritious foods per calorie that you can eat. Oyster calories are low—a single medium raw oyster has about 10 to 14 calories—while protein in oysters is meaningful for such a small food. Oysters calories stack up favorably against most animal proteins: a 6-oyster appetizer delivers 70 to 90 calories with 8 to 10 grams of protein and virtually no fat. How many calories in a raw oyster varies slightly by species and size, but the range is narrow. For anyone concerned about fat mons pubis or excess body fat, oysters are one of the few genuinely high-satiety, low-calorie protein sources that take no prep work if eaten raw. This article covers the full oyster nutrition profile, how cooking changes the numbers, and how to use oysters strategically in a fat-loss diet.

Oyster calorie and macro breakdown

Per 6 medium raw oysters (approximately 84g):
Calories: 70–90
Protein: 8–10g
Fat: 2–3g
Carbohydrates: 4–6g (from glycogen stored in oyster tissue)
Zinc: 32–76mg (300–600% of daily value, varying by species)
Vitamin B12: 16–24mcg (600–900% of daily value)
Iron: 5–7mg (30–40% of daily value)
Omega-3 fatty acids: 350–500mg
The carbohydrate content surprises most people—oysters store glycogen, which registers as carbs. This is still very low in absolute terms and doesn’t affect how oysters fit into most diets including low-carb approaches.

Protein in oysters compared to other seafood

Protein in oysters per calorie is excellent. At roughly 1 gram of protein per 9 to 12 calories, oysters compare favorably to: shrimp (1g protein per 7 calories), salmon (1g per 14 calories), and canned tuna (1g per 7 calories). Oysters are more nutrient-dense than salmon in terms of micronutrients per calorie, particularly for zinc and B12. The zinc content alone makes oysters worth eating regularly—zinc supports immune function, testosterone production, wound healing, and taste and smell perception.

Raw vs cooked oyster calories

How many calories in a raw oyster versus a cooked one? The base calorie count from cooking without additions is nearly identical. The preparation method changes calories significantly when oil, breading, or sauces are added. Steamed oysters have essentially the same calorie count as raw. Oysters Rockefeller (baked with butter, spinach, and cheese) can reach 50 to 80 calories per oyster. Fried oysters in breading run 100 to 180 calories per oyster depending on oil absorption and breading thickness. For fat loss purposes, raw on the half shell or steamed with minimal additions delivers all the nutrition without the calorie overhead of cooking preparations.

Oysters in a fat-loss diet

Oysters calories are low enough that eating 12 raw oysters as a meal—something most people find filling due to the high zinc and protein content—delivers only 140 to 180 calories. Zinc specifically may help with fat loss by supporting the function of leptin, the satiety hormone. Low zinc status is associated with increased appetite and reduced leptin sensitivity. The practical implication: people who eat oysters regularly may find appetite management easier, independent of the calorie math. Pair oysters with a salad and sparkling water for a complete lunch under 300 calories that provides 15 to 20 grams of protein.

Food safety considerations

Raw oysters carry risks from Vibrio vulnificus and norovirus, both of which are present in some oyster beds. Immunocompromised individuals, pregnant women, people with liver disease, and those on immunosuppressant medications should avoid raw oysters entirely. Cooked oysters (steamed to an internal temperature of 145F for 15 seconds) eliminate these pathogens. Oysters harvested from certified waters and served at reputable restaurants carry lower risk than those of unknown origin. The date of harvest matters too—summer months in warmer waters carry higher Vibrio risk.

Safety recap: Raw oyster consumption carries a real (if small) risk of foodborne illness for healthy adults. Individuals with compromised immune systems or liver conditions should always eat oysters fully cooked. Choose certified-source oysters from reputable suppliers to minimize risk while preserving the nutritional benefits.