The Wonder Files

Omega-3

Omega-3 fatty acids (EPA, DHA, ALA) are essential nutrients critical for cellular function but cannot be synthesized by the body. Found in fatty fish, algae, and supplements, they are renowned for their roles in heart health, cognitive function, and inflammation regulation.

Cardiovascular Protection

  • Reduced Mortality in Heart Patients: GISSI-Prevenzione Investigators found a 20% reduction in total mortality and a 30% reduction in cardiovascular death / 45% reduction in sudden cardiac death

  • Mechanism: EPA/DHA reduce inflammation, improve lipid profiles, and inhibit platelet aggregation.

  • Dosage: 1–3g EPA/DHA daily for cardiovascular protection.

  • Sources: Fatty fish (salmon, mackerel) 2–3x/week or supplements.

Brain & Cognitive Function

  • DHA and Dementia: Framingham Heart Study, Schaefer et al. (2006) (Arch Neurol), found that participants in the top quartile of plasma DHA had a 47% reduced risk of developing all-cause dementia

  • Cognitive Performance:: Yurko-Mauro’s 2010 MIDAS trial evaluated age-related cognitive decline in healthy older adults using 900 mg DHA/day for 6 months. Found reduction in learning errors was equivalent to individuals 3 to 7 years younger.

  • Mechanism: DHA is a major structural component of brain cell membranes and supports neurotransmitter function.

  • Dosage: 200–500mg DHA daily for brain health.

  • Sources: Algal oil (vegan) or fish oil.

Anti-Inflammatory Effects

  • Rheumatoid Arthritis: Kremer et al. (1990, Arthritis & Rheumatism) found statistically significant reductions in tender joint counts and morning stiffness in patients taking 3g EPA daily.

  • Meta-analyses (e.g., Goldberg & Katz, 2007) show omega-3s act primarily as NSAID-sparing agents, reducing joint tenderness rather than eliminating pain by a set percentage.

  • Dosage: 1–2g EPA/DHA daily for inflammatory conditions.

  • Sources: Cod liver oil or concentrated supplements.

Mental Health & Depression

  • Adjuvant Therapy: A meta-analysis (Appleton et al., 2015, Cochrane Database) found omega-3s produced a small to modest improvment in depression symptoms when combined with antidepressants.

  • The 2015 landmark meta-analysis by Appleton et al. was published in the Cochrane Database of Systematic Reviews, not JAMA Psychiatry. Additionally, Cochrane’s conclusion found a small-to-modest symptom reduction

  • EPA vs. DHA: Sublette et al. (2011, J Clin Psychiatry) showed EPA (1g/day) was more effective than DHA for major depressive disorder.

  • Mechanism: May enhance serotonin synthesis and reduce neuroinflammation.

  • Dosage: 1–2g EPA daily for depression support.

  • Note: Not a standalone treatment; consult a healthcare provider.

Metabolic Health & Weight Management

  • Insulin Sensitivity: Flachs et al. (2005, Diabetes) demonstrated omega-3s activate PPAR-α receptors, improving fat metabolism.

  • Dosage: 1g EPA/DHA daily.

  • Sources: Fish oil or plant-based alternatives.

MDPIDocosahexaenoic Acid and Cognition throughout the LifespanDocosahexaenoic acid (DHA) is the predominant omega-3 (n-3) polyunsaturated fatty acid (PUFA) found in the brain and can affect neurological function by modulating signal transduction pathways, neurotransmission, neurogenesis, myelination, membrane receptor function, synaptic plasticity, neuroinflammation, membrane integrity and membrane organization. DHA is rapidly accumulated in the brain during gestation and early infancy, and the availability of DHA via transfer from maternal stores impacts the degree of DHA incorporation into neural tissues. The consumption of DHA leads to many positive physiological and behavioral effects, including those on cognition. Advanced cognitive function is uniquely human, and the optimal development and aging of cognitive abilities has profound impacts on quality of life, productivity, and advancement of society in general. However, the modern diet typically lacks appreciable amounts of DHA. Therefore, in modern populations, maintaining optimal levels of DHA in the brain throughout the lifespan likely requires obtaining preformed DHA via dietary or supplemental sources. In this review, we examine the role of DHA in optimal cognition during development, adulthood, and aging with a focus on human evidence and putative mechanisms of action.
Cochrane Database of Systematic ReviewsOmega-3 fatty acids for depression in adultsKatherine M Appleton, Philip D Voyias, Hannah M Sallis et al. · 2021
The LancetDietary supplementation with n-3 polyunsaturated fatty acids and vitamin E after myocardial infarction: results of the GISSI-Prevenzione trialDietary supplementation with n-3 PUFA led to a clinically important and satistically significant benefit. Vitamin E had no benefit. Its effects on fatal cardiovascular events require further exploration.
PubMed Central (PMC)The Age-Related Eye Disease Study 2 (AREDS2): Study Design and Baseline Characteristics (AREDS2 Report Number 1)The Age-Related Eye Disease Study (AREDS) demonstrated beneficial effects of oral supplementation with antioxidant vitamins and minerals on the development of advanced age-related macular degeneration (AMD) in persons with at least intermediate AMD ...
Psychiatrist.comMeta-Analysis of the Effects of Eicosapentaenoic Acid (EPA) in Clinical Trials in DepressionObjective: Randomized trials of omega-3 polyunsaturated fatty acid (PUFA) treatment for depression have differed in outcome. Recent meta-analyses ascribe discrepancies to differential effects of eicosapentaenoic acid (EPA) versus docosahexaenoic acid (DHA) and to diagnostic heterogeneity. This meta-analysis tests the hypothesis that EPA is the effective component in PUFA treatment of major depressive episodes.