Last reviewed: July 2026 · SecondFyre Alkemy Kitchen
Omega-3 fatty acids are essential — meaning your body cannot make them and must obtain them from food. There are three main types: EPA (eicosapentaenoic acid), DHA (docosahexaenoic acid), and ALA (alpha-linolenic acid). EPA and DHA are found in fatty fish and marine sources. ALA is found in flaxseed, walnuts, chia seeds, and hemp seeds. The body can convert ALA to EPA and DHA, but inefficiently — roughly 5-10% conversion. If you’re not eating fish, you need to know this.
What They Do That’s Relevant to Midlife
Brain and cognitive function. DHA is a structural component of brain cell membranes — literally the material from which neurons are built. The brain is approximately 60% fat, and DHA makes up a significant portion of that. Adequate DHA intake is associated with slower cognitive decline and better memory performance. For women experiencing brain fog in perimenopause, this is directly relevant.
Inflammation. EPA is the primary anti-inflammatory omega-3. It competes with arachidonic acid (an omega-6 fatty acid that promotes inflammation) for the same enzymatic pathways, reducing the production of pro-inflammatory compounds. Joint pain, skin inflammation, mood dysregulation — all have inflammatory components that omega-3s address at the biochemical level.
Mood and depression. Meta-analyses have found omega-3 supplementation (particularly EPA) reduces depressive symptoms, with effects comparable to some antidepressants in mild-to-moderate depression. The mechanism involves both anti-inflammatory effects and direct effects on neurotransmitter function. For perimenopausal mood changes, omega-3s are worth taking seriously.
Cardiovascular health. Post-menopause, cardiovascular risk increases substantially. Omega-3s reduce triglycerides, modestly lower blood pressure, reduce platelet aggregation, and have anti-arrhythmic effects. The cardiovascular case for omega-3s is one of the strongest in nutritional research.
Bone health. Emerging research suggests omega-3s support bone density by reducing the osteoclast activity (bone breakdown) that accelerates in menopause. The effect is modest but consistent and adds to the case for adequate omega-3 intake in midlife.
How Much and From Where
The target for EPA + DHA combined is approximately 500mg-1g daily for general health; 2-3g daily for therapeutic anti-inflammatory effects.
Fatty fish is the most bioavailable source. Salmon, mackerel, sardines, anchovies, and herring are the richest sources. Two servings of fatty fish per week provides roughly 500mg-1g of EPA+DHA daily — enough for general maintenance. For therapeutic effects, supplementation is more practical.
Fish oil supplements are the most common form. Algae-based omega-3 supplements provide DHA (and increasingly EPA) from the same marine algae that fish eat — making them vegan-appropriate and avoiding the heavy metal concerns of some fish sources. For women not eating fish, algae-based omega-3 supplements are the correct alternative.
ALA from plant sources (walnuts, flaxseed, chia) is valuable but not a substitute for marine omega-3s for most people, due to the poor conversion rate. Include them. Also either eat fish or take a supplement.
Last reviewed: July 2026 · SecondFyre Editorial
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