Octopus or squid: which is healthier?
Full comparison · Protein · Calories · Healthier
Neither food is healthier in every way. Per 3.5 oz (100 g), here is where octopus and squid differ against FDA Daily Values, so you can choose for what you need more or less of.
Octopus
- More of: vitamin b12 (833% vs 54% DV), iron (29% vs 4% DV), vitamin a (5% vs 1% DV), potassium (7% vs 5% DV).
- Also more of what the FDA treats as nutrients to limit: sodium (10% vs 2% DV).
Squid
- No nutrient where it is clearly ahead.
- Also more of what the FDA treats as nutrients to limit: cholesterol (78% vs 16% DV).
Beyond the nutrient table
Health effects depend on more than composition: how much you eat, what it replaces, and the studies on each food. These pages grade that evidence:
What the numbers don't tell you
Most searches for this pair ask which animal is smarter or which would win a fight. On the plate the two are close. Raw, they carry similar protein and calories per 3.5 oz (100 g). Octopus has far more iron, 5.3 mg against 0.68 mg, and about five times the sodium, 230 mg against 44 mg. Squid has nearly five times the cholesterol, 233 mg against 48 mg. In a small feeding study from 1990, 18 men ate a squid diet and their blood lipids did not change.
The real difference is allergy. In 48 Spanish patients with shellfish allergy, skin tests with raw and boiled extracts, octopus and squid among them, reacted alike, so boiling did not lower reactivity. Among 45 people with mollusk allergy, cephalopods, squid above all, were the most frequent trigger. With any shellfish allergy, ask your allergist before trying either.
One forensic report describes a man in treatment for depression who choked to death on octopus tentacles. Cut it small for anyone who has trouble chewing or swallowing. In an Italian market survey, squid was among the samples above the EU cadmium limit. In pregnancy and early childhood, a review of 46 studies linked shellfish with higher contaminant markers, mercury above all.
Pick the one you enjoy. Allergy and chewing matter more than the nutrition gap.
Evidence behind this note
- Level C In 18 men fed six kinds of shellfish, a squid diet, higher in cholesterol, did not change blood lipids and raised HDL2 cholesterol. Am J Clin Nutr, 1990
- Level B In 18 normolipidemic men fed six shellfish species in turn, the squid diet left blood lipids unchanged despite carrying more cholesterol than the other shellfish, and it raised HDL2 cholesterol. Am J Clin Nutr, 1990
- Level C In 48 people with shellfish allergy, skin tests with raw and boiled octopus, squid and limpet extracts reacted alike, so cooking does not remove these allergens. Allergol Immunopathol (Madr), 1994
- Level C Among 45 patients with mollusc allergy in northern Spain, 25 (55%) reacted to cephalopods, squid most often of all, and tropomyosin carried the cross-reactivity with dust mites and crustaceans. J Investig Allergol Clin Immunol, 2024
- Level D A forensic case series includes a death from choking on octopus tentacles in a man treated for depression, one of several food bolus deaths in people with impaired swallowing. Clin Ter, 2024
- Level C In Italian market samples, cadmium exceeded the EU maximum level in squid, a close relative of octopus, while mercury stayed highest in predatory fish. Food Addit Contam Part A Chem Anal Control Expo Risk Assess, 2012
- Level D In an Italian market survey cadmium was the single metal that exceeded European maximum levels in squid, while weekly intake of cadmium from all fish and seafood reached 20% of the tolerable weekly intake at the median and passed it only at the 95th percentile of consumption. Food Addit Contam Part A Chem Anal Control Expo Risk Assess, 2012
- Level C A review of 46 studies on molluscs and crustaceans in pregnancy and early childhood found higher contaminant biomarkers, mainly mercury, and a benefit mostly for iodine status. Nutr Res Rev, 2025
Written from the studies and agency guidance we hold for both foods, reviewed by the Bioma editorial system. How we verify.
Keep exploring
Read more about these foods
- Octopus: a modest portion with a very large vitamin B12 number
- Squid: more cholesterol than other shellfish, and blood lipids that did not move
Rankings and guides
- Fiber: what it does and how much you need
- Sodium: what it does and how much you need
- Which foods are highest in potassium?
More comparisons
Where the numbers come from
- Octopus: USDA FoodData Central, Mollusks, octopus, common, raw, FDC ID 174218 · all forms of octopus
- Squid: USDA FoodData Central, Mollusks, squid, mixed species, raw, FDC ID 174223 · all forms of squid
Each food is one USDA entry, chosen as it is usually eaten. Other cuts, brands and preparations differ; the links show them. % DV uses FDA Daily Values for adults. How we verify.