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Omega-3 Fatty Acids

Omega-3 fatty acids (ALA, DHA, EPA, DPA)​

Chemical structure

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

Overview​

Omega-3 fatty acids, particularly EPA (eicosapentaenoic acid) and DHA (docosahexaenoic acid), are essential polyunsaturated fats that are central to the BRAIN Diet. DHA constitutes approximately 14% of brain polyunsaturated fatty acids and is critical for membrane fluidity, neurotransmitter receptor function, and synaptic plasticity. Omega-3s produce specialized pro-resolving mediators (SPMs) including resolvins, protectins, and maresins, which actively terminate inflammation without suppressing immune function. They also support the endocannabinoid system through production of N-acyl ethanolamines, improve vagal tone and heart rate variability, and work synergistically with B vitamins in methylation processes. Phospholipid-bound forms (from krill oil, fish roe) cross the blood-brain barrier more efficiently than triglyceride forms.

Recipes​

5 recipes containing this substance

Mixed-Leaf Tahini Caesar Salad

A Caesar-style mixed-leaf salad with a tahini, anchovy, caper and Parmesan dressing, using extra virgin olive oil retained from oil-packed capers.

Salmon Bowl-pistachio-cacao-nibs

A Mediterranean-style bowl combining salmon, avocado, pistachios, cacao nibs, and early harvest olive oil — rich in omega-3 fats, polyphenols, and fibre.

Foods​

14 foods containing this substance

Anchovies

Small oily fish, typically canned and drained, providing EPA, DHA and niacin

Cockles

Bivalve shellfish providing B12, iron, zinc, selenium, and marine taurine

Cod

Lean fish with omega-3, taurine, and creatine

Herring

Oily fish rich in EPA/DHA omega-3s

Lumpfish Roe

Salted lumpfish caviar — budget-friendly; high salt; lower omega-3 than salmonid roe

Mackerel

Oily fish rich in EPA/DHA, CoQ10, taurine, and vitamin D

Mussels

Nutrient-dense bivalve providing phospholipid-bound omega-3s; accepted by some vegans (ostroveganism)

Oysters

Highest zinc content among common foods; unique source of phospholipid-bound omega-3s; accepted by some vegans (ostroveganism)

Salmon

Oily fish rich in EPA/DHA, protein, and B vitamins

Salmon Roe

Premium salmon (ikura) eggs — phospholipid-bound EPA/DHA and choline

Sardines

Small oily fish rich in EPA/DHA, CoQ10, and calcium

Seaweed

Iodine, EPA (in red algae), magnesium, and trace minerals

Trout Roe

Rainbow trout eggs — phospholipid omega-3s; typically mid-tier vs salmon ikura

Tuna

Fish providing omega-3, niacin, selenium, and complete protein

Biological Mechanisms and Implications​

No biological targets found for substance: Omega-3 Fatty Acids

References​

  • Lipids constitute 50–60% of brain dry weight; DHA ~14% of brain PUFA varies by region; omega-3s influence gene expression, neurotransmission, inflammation resolution, and synaptic plasticity McNamara and Carlson 2006
  • Phospholipid-bound omega-3s (e.g., krill oil, fish roe) enhance brain DHA accretion via LPC transport; APOE4 carriers show reduced brain DHA uptake Arellanes et al. 2020
  • DHA or EPA incorporated into PC and converted into lysophosphatidylcholine (LPC) crosses the blood-brain barrier far more efficiently than free fatty acid or triglyceride-bound forms Patrick 2019
  • Phospholipid-bound omega-3s such as krill oil and fish roe were 1.9-fold more efficacious for brain gray matter DHA accretion in porcine models Liu et al. 2014
  • Specialized pro-resolving mediators (SPMs), derived from omega-3s (DHA and EPA), terminate inflammation without suppressing immune surveillance; include resolvins, protectins, and maresins Serhan and Petasis 2011
  • SPMs modulate endothelial function through nitric oxide release and support neuroprotection by limiting glutamate-induced excitotoxicity Briones et al. 2025
  • In a controlled endotoxemia model, high-dose EPA+DHA (3.6 g/day) attenuated fever and downstream cytokines, suggesting omega-3s reshape the resolution phase of acute inflammation Ferguson et al. 2014
  • SAMe-dependent phospholipid methylation via PEMT converts phosphatidylethanolamine to phosphatidylcholine, altering membrane structure and fluidity Vance 2014
  • Reduced gamma-band activity has been reported in ADHD Wilson et al. 2012
  • While folate is normally considered the primary nutrient for homocysteine reduction, long-chain omega-3 fatty acids and vitamin B12 also contribute meaningfully; B12+fish oil lowered plasma homocysteine by 39% Tao Huang et al. 2015
  • B vitamin supplementation slowed cognitive decline only in participants with adequate omega-3 status, supporting a nutrient synergy model Oulhaj et al. 2016
  • Western diets can skew n-6:n-3 ratio as high as 20:1, contributing to chronic inflammation and neurotransmitter dysregulation Simopoulos 2011
  • Most research showing brain function improvements lean towards higher ratio of EPA to DHA (e.g., 2:1 ratio), with DHA having a more structural role and EPA with a more functional role Pei-Chen Chang 2021