Sardines
Overview
Sardines are small oily fish eaten whole, providing long-chain omega-3 fatty acids EPA and DHA, vitamin B12, selenium, calcium from the softened bones, and highly digestible protein. Because canned sardines typically include the skeleton, they contribute meaningfully to both marine omega-3 intake and calcium alongside B12 and other micronutrients [1]. These intrinsic nutrients support neuronal membrane structure, mitochondrial bioenergetics, and red blood cell formation.
Within the BRAIN Diet framework, sardines are treated as a compact, shelf-stable oily fish that can be used when fresh fish is less practical. Regular intake of oily fish rich in EPA and DHA is associated with reduced cardiovascular risk and may support aspects of cognitive and mood outcomes [1,2]. Compared with larger predatory fish, sardines sit low in the marine food chain and generally accumulate less mercury, which supports their use as a frequent marine omega-3 source in many dietary patterns [3].
Key Nutritional Highlights
- Highest total omega-3 among BRAIN Diet fish and seafood pages (per 100 g).
- Provides complete, highly digestible protein.
- Commonly contributes selenium, iodine, and vitamin B12, though levels vary by species.
- EPA/DHA content is highly species-dependent; oily fish are usually higher than lean fish or shellfish.
- Often lower in saturated fat than many fatty red-meat patterns when minimally processed.
- Nutritional profile and risk context depend on processing method (fresh vs salted/smoked/cured).
Food Context
Sourcing
- Choose sardines from reputable brands and fisheries that publish sustainability and contaminant information; smaller pelagic species such as sardines typically show lower mercury levels than larger predatory fish.
- Canned sardines packed in extra-virgin olive oil or water are preferable to those in refined oils or heavily sweetened sauces, to maintain a healthier overall fat profile.
Preparation
- Sardines can be eaten directly from the can or lightly warmed; avoid prolonged high-temperature frying or charring that can oxidize lipids.
- When tolerated, consuming the bones together with the fillet maximizes calcium intake from the food; combining sardines with vegetables and whole grains helps integrate this dense source of omega-3s into balanced meals.
Recipes
Nutrient Tables (per 100 g)
Core nutrients
| Nutrient | Amount per 100 g | % RDA per 100 g |
|---|---|---|
| Energy | 902 kcal | — |
| Protein | 0 g | — |
| Total fat | 100 g | — |
| Saturated fat | 29.9 g | — |
| Carbohydrates | 0 g | — |
| Fibre | 0 g | — |
Key micronutrients
| Nutrient | Amount per 100 g | % RDA per 100 g |
|---|---|---|
| Iron | 0 mg | 0% |
| Zinc | 0 mg | 0% |
| Magnesium | 0 mg | 0% |
| Selenium | 0 µg | 0% |
| Calcium | 0 mg | 0% |
| Potassium | 0 mg | 0% |
| Folate | 0 µg | 0% |
| Vitamin B12 | 0 µg | 0% |
| Vitamin B6 | 0 mg | 0% |
Bioactive compounds
Values below are often from specialist compositional databases or literature, not the standard USDA panel. Asterisks (*) refer to source notes at the bottom of this section.
| Compound / class | Amount per 100 g | Notes |
|---|---|---|
| EPA | 10137 mg | — |
| DHA | 10656 mg | — |
Note: Bioactive-compound values vary substantially by cultivar, species, cocoa or oil percentage, processing, and brand formulation. Show quantitative values only where a defensible source exists; otherwise prefer qualitative presence statements or ranges in source notes.
Substances
Substances in this food: editorial (Overview / literature) plus analytical (nutrition table).
7 substances in this food
Calcium
Bone health; neurotransmission; interacts with vitamin D and K2
Coenzyme Q10 (CoQ10)
Electron transport chain cofactor and antioxidant relevant to mitochondrial function
DHA (Docosahexaenoic Acid)
Accounts for ~10–15% of total brain fatty acids, 20–30% of neuronal phospholipids (PE, PS), and >90% of brain omega-3 PUFA; critical for membrane fluidity, synaptic vesicle fusion, neurodevelopment
EPA (Eicosapentaenoic Acid)
Potent anti-inflammatory; precursor to E-series resolvins; modulates dopamine and serotonin signalling
Selenium
Antioxidant enzyme cofactor (GPx); supports redox balance
Vitamin B12 (Cobalamin)
Methylation; myelin; mitochondrial odd-chain FA metabolism
Vitamin B3 (Niacin; Niacinamide)
NAD+ precursor; supports mitochondrial biogenesis and ATP production
References
These references link to the BRAIN Diet bibliography page, where the full citation and DOI/external source link are provided.