How the diets react
Diet Ratings
Crab is nearly carb-free (0-1g net carbs per 100g), high in protein, and provides moderate healthy fats. Excellent keto-compatible shellfish option.
Crab is a crustacean and animal flesh. Completely incompatible with vegan diet.
Shellfish consumed by Paleolithic coastal populations. Unprocessed, protein-rich, and nutrient-dense with no excluded ingredients.
Shellfish providing lean protein, minerals, and omega-3s. Crab is consumed in Mediterranean coastal regions. Low saturated fat content aligns with diet principles.
Crab is a pure animal-derived shellfish with excellent protein content, zinc, and B vitamins. Low carbohydrate and widely accepted across all carnivore protocols.
Crab is a whole, unprocessed shellfish with no excluded ingredients. Explicitly compliant with Whole30.
Crab is low in fermentable carbohydrates. Monash University confirms shellfish as low-FODMAP at standard serving sizes (approximately 100g).
Lean protein and good nutrient profile, but naturally higher in sodium (especially canned/processed varieties). Fresh crab is better than canned. Cholesterol moderate. Acceptable in moderation.
Good protein but contains moderate carbs (~0.5-1g per 100g depending on species) and slightly higher fat than white fish. Usable in Zone but requires careful portioning and fat accounting.
Some practitioners rate crab higher due to minimal carb content and nutrient density. Carb levels vary significantly by crab type (blue crab vs. king crab).
Provides lean protein, zinc, and selenium, but low in omega-3 fatty acids. Acceptable occasionally but not a primary anti-inflammatory protein source.
Crab's micronutrient profile (zinc, selenium, B12) supports immune function. Some nutritionists view it as neutral rather than cautionary.
High protein (17g per 3oz), low fat (2g), nutrient-dense (zinc, selenium, B12). Slightly higher sodium in some preparations but not clinically problematic. Portion-friendly and easy to digest.
Controversy Index
Score range: 1–9/10. Higher controversy = more disagreement between diets.