Omega-3 fatty acids—especially eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA)—are well-studied nutrients linked to brain function, cardiovascular health, and the regulation of inflammatory signaling. In a nutrition “cheat sheet” style approach, foods such as herring and salmon are commonly highlighted because they deliver EPA and DHA in bioavailable form, supporting multiple organ systems simultaneously.
1) Chemical and biological roles of EPA/DHA
EPA and DHA are long-chain polyunsaturated fatty acids incorporated into cell membranes, including neuronal membranes and cardiomyocyte membranes. DHA is particularly enriched in the central nervous system and contributes to membrane fluidity, synaptic function, and receptor signaling. EPA and DHA also serve as substrates for specialized pro-resolving mediators (SPMs), including resolvins, protectins, and maresins, which actively terminate inflammatory responses rather than merely suppress them.
2) Brain and cognitive mechanisms
The brain depends heavily on membrane phospholipids; DHA is a structural component that influences ion channel behavior, neurotransmitter release, and synaptic plasticity. Observational and interventional research associates higher omega-3 intake with improved aspects of cognitive performance and mood regulation in some populations, though effects vary by baseline status, dosage, and study design. Mechanistically, omega-3s may support neurovascular function, reduce pro-inflammatory cytokines (e.g., tumor necrosis factor-alpha, interleukin-1β), and modulate microglial activation toward a less reactive phenotype. These effects are relevant because chronic low-grade inflammation can impair synaptic function and contribute to mood and cognitive symptoms.
3) Mood and neuroimmune regulation
While omega-3s are not a stand-alone treatment for psychiatric disorders, EPA-predominant formulations have been evaluated as adjunctive therapy in major depressive disorder and other mood conditions. The hypothesized pathway involves shifting the balance of eicosanoids and cytokines, reducing neuroinflammation, and influencing serotonergic and dopaminergic signaling indirectly through inflammatory mediators. In clinical practice, dosing often targets a meaningful EPA exposure rather than minimal “fish-flavor” intake.
4) Cardiovascular protection
Omega-3 fatty acids contribute to cardiovascular health through multiple mechanisms: (a) triglyceride lowering via reduced hepatic very-low-density lipoprotein (VLDL) production and enhanced fatty-acid oxidation; (b) improvement of endothelial function and microvascular perfusion; (c) modulation of platelet aggregation and vascular inflammation; and (d) effects on cardiac electrophysiology that can reduce arrhythmogenic risk in certain settings. High-quality evidence supports omega-3 therapy for hypertriglyceridemia and suggests potential benefits for secondary prevention, although results depend on formulation, baseline risk, and the use of concomitant guideline-directed therapies.
5) Anti-inflammatory and “resolution” biology
A key contemporary concept is inflammation resolution. EPA and DHA are converted into SPMs that promote clearance of cellular debris and limit further neutrophil recruitment. This is distinct from non-steroidal anti-inflammatory drug strategies, which often reduce inflammatory signaling but may not actively promote resolution. In metabolic and vascular disease, chronic inflammation contributes to insulin resistance, atherosclerotic progression, and tissue dysfunction; omega-3-driven resolution pathways may mitigate these processes.
6) Practical dietary sources and bioavailability
Herring and salmon are dense sources of EPA and DHA. Dietary omega-3s also compare favorably to some supplements because whole-food matrices can influence absorption and adherence. However, real-world intake varies by species, portion size, and preparation method. For people who do not consume fish, algae-derived DHA or fish oil supplements are alternatives, but clinicians often consider the EPA:DHA ratio and total dose.
7) Safety considerations and contraindications
Omega-3 fatty acids are generally well-tolerated at dietary levels and at evidence-based supplemental doses. Potential adverse effects include gastrointestinal discomfort and, at higher doses, an increased bleeding tendency in certain individuals—particularly those on anticoagulants or antiplatelet agents. People with known bleeding disorders should seek individualized guidance. Omega-3 supplements can also vary in purity and concentration; choosing products with third-party testing can reduce risk of contaminants such as heavy metals.
8) Evidence-based framing for a “cheat sheet”
Nutrition patterns that elevate omega-3 intake often coincide with other beneficial dietary elements (e.g., lower ultra-processed foods, higher micronutrient density). Therefore, omega-3 benefits should be viewed as part of a broader cardiometabolic and neuroimmune strategy that includes adequate protein, fiber, micronutrients, and overall caloric balance. For medical conditions like hypertriglyceridemia or depression, omega-3s are best considered an adjunct to evidence-based therapies.
Source: Siim Land (creator) via X post by @siimland (Jul 23, 2026).
Siim Land: Health food cheat sheet🥘🫐: Brain – herring, olive oil, walnuts, eggs Eyes – carrots, liver, blueberries Skin – gelatin/collagen, citrus fruits Heart – salmon, beetroot, olive oil Liver – cruciferous vegetables, cranberries, onions Bones – kefir, Greek yogurt, dried prunes,. #breaking
— @siimland May 1, 2026
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