Omega-3s: Healthy Fats for a Healthier Brain

More fat for better health? It may sound surprising, but the right kind of fat can be an important part of a healthy diet—and a healthy brain!

Omega-3 fatty acids are healthy polyunsaturated fatty acids (PUFAs) that play an important role throughout the body. Research increasingly supports a diet rich in omega-3s as part of a broader approach to maintaining heart and brain health and promoting healthy aging.

There are several types of omega-3 fatty acids, but the three most important are alpha-linolenic acid (ALA), docosahexaenoic acid (DHA), and eicosapentaenoic acid (EPA), with each having a unique role in supporting overall health.

So how might omega-3s support an aging brain?

Omega-3s, Inflammation, and the Aging Brain

Chronic inflammation and oxidative stress are linked to cognitive decline (Alzheimer’s disease), as well as cardiovascular disease, cancer, and diabetes. A diet rich in omega-3s and antioxidant-rich foods may help support the body’s defenses.

ALA is an essential omega-3 fatty acid — the body cannot produce it and must obtain it through the diet. It is incorporated into cell membranes throughout the body and serves as a precursor for small amounts of EPA and DHA. Because this conversion is limited, dietary sources of preformed EPA and DHA remain important.

DHA is the main omega-3 fatty acid in the brain and helps keep membranes fluid so neural signals travel efficiently.

EPA plays an important role in regulating inflammatory signaling and can contribute to the production of specialized molecules that help the body resolve inflammation.

Together, ALA, EPA and DHA play important roles in maintaining a healthy brain and regulating the body’s inflammatory response. Chronic, low-grade inflammation can increase with age and may negatively affect many aspects of brain health, including memory, cognitive function, mood, and overall brain resilience. Omega-3 fatty acids may help support a more balanced inflammatory response by influencing the signaling pathways involved in inflammation and its resolution. While omega-3s are not a treatment for neuroinflammatory or neurodegenerative diseases, getting enough of these essential fats as part of an overall healthy diet may help support healthy brain function and aging.

Food First, Supplements When Needed

Getting omega-3s through food is the preferred approach to supporting a nutrient-dense, brain-healthy diet. A Mediterranean-style diet rich in vegetables, fruits, whole grains, legumes, nuts, seeds, olive oil, and seafood can provide a variety of nutrients that support overall health, including omega-3 fatty acids.

Omega-3 Food Sources

ALA is primarily found in plant foods and is the most common form of omega-3 in the typical American diet. Dietary sources of ALA include flaxseeds and flax oil, chia seeds, walnuts and walnut oil, hemp seeds, and hemp oil, mustard oil, most leafy green vegetables, and tofu.

EPA and DHA are found primarily in fish and seafood. Fatty, cold-water fish, such as salmon, trout, herring, mackerel, and sardines, as well as shellfish such as shrimp, oysters, clams, and scallops are all good sources. For general health, many dietary guidelines recommend eating fish, particularly fatty fish, about two times per week.

For those who don’t eat fish, algae-based foods and supplements can provide omega-3s. Algal oil supplements are a particularly useful vegetarian source of DHA, and some provide EPA as well.

When Supplementation Might Be Appropriate

When diets don’t meet the mark for individual nutritional needs, supplementation may be recommended, but should always be done under the supervision of a qualified health professional. This is especially important if you have cardiovascular disease, a history of atrial fibrillation, take anticoagulant or antiplatelet medications, or are taking other supplements or medications. Recent evidence suggests that high-dose EPA/DHA supplementation—particularly doses above 1,500 mg per day—has been associated with an increased risk of atrial fibrillation in people at high cardiovascular risk.

In sum, Omega-3s can be an important part of a brain-supportive diet, but lasting brain health depends on the bigger picture that includes nutrition, exercise, sleep, stress management and metabolic health. Food should always be the first source of omega-3 fatty acids. Whole foods provide omega-3s alongside protein, vitamins, minerals, fiber, and other beneficial compounds that supplements don’t provide. For some individuals, however, supplementation may be appropriate based on dietary intake, health status, triglyceride levels, cardiovascular risk and other individual factors.

Research