- Omega-3s reduce triglycerides by 15-30% at therapeutic doses.
- EPA and DHA from fish are the most bioavailable forms of omega-3.
- The AHA recommends eating fatty fish at least twice per week.
Types of Omega-3 Fatty Acids
There are three main types of omega-3 fatty acids: ALA (alpha-linolenic acid), EPA (eicosapentaenoic acid), and DHA (docosahexaenoic acid). ALA is found in plant sources like flaxseed and walnuts, while EPA and DHA come primarily from fatty fish and algae.
The body converts ALA to EPA and DHA very inefficiently, with conversion rates typically below 10%. This is why direct sources of EPA and DHA, whether from fish or supplements, are considered more effective for cardiovascular benefits.
- ALA: flaxseed, chia seeds, walnuts
- EPA: salmon, mackerel, sardines, fish oil
- DHA: fatty fish, algae oil supplements
Heart Health Benefits
Omega-3 fatty acids lower triglyceride levels, reduce inflammation, and may help prevent irregular heartbeats. High-dose omega-3 supplements have been shown to reduce triglycerides by 15-30% in people with elevated levels.
The AHA recommends eating at least two servings of fatty fish per week to obtain heart-protective amounts of EPA and DHA. For those with documented heart disease, higher supplemental doses may be recommended under medical supervision.
- Reduces triglycerides at therapeutic doses
- May lower risk of arrhythmias
- Supports healthy blood vessel function
Brain and Inflammation Benefits
DHA is a major structural component of brain cell membranes and is critical for cognitive function. Adequate omega-3 intake has been associated with reduced risk of cognitive decline in aging populations.
EPA has potent anti-inflammatory properties that may benefit conditions driven by chronic inflammation. Research continues to explore omega-3 roles in mood regulation, joint health, and immune function.
- DHA supports brain structure and cognitive function
- EPA helps reduce systemic inflammation
- May support mood and mental health
Food Sources and Supplementation
Fatty fish like salmon, mackerel, herring, and sardines are the richest dietary sources of EPA and DHA. A 3.5-ounce serving of salmon provides roughly 1,500-2,000 mg of combined EPA and DHA.
For those who do not eat fish regularly, fish oil or algae-based supplements can fill the gap. The NIH notes that most adults can safely consume up to 3 grams of combined EPA and DHA daily from supplements.
- Eat fatty fish at least twice per week
- Fish oil supplements typically provide 250-500 mg EPA+DHA per capsule
- Algae-based supplements are a vegan alternative