The Science Behind Omega-3s
Omega-3 polyunsaturated fatty acids reduce inflammation, improve blood flow, lower triglycerides, and stabilize heart rhythm. Populations consuming high omega-3 diets show lower heart disease rates.
Types of Omega-3s
EPA and DHA are long-chain omega-3s found primarily in fatty fish. These show the strongest cardiovascular benefits in research.
ALA is a short-chain omega-3 found in plant sources like flax seeds and walnuts. The body converts some ALA to EPA and DHA, though conversion is inefficient.
Fish Sources
Fatty fish contain the most EPA and DHA:
- Salmon (2.3g per 3.5oz serving)
- Mackerel (2.7g per serving)
- Sardines (2.2g per serving)
- Herring (1.7g per serving)
- Trout (1g per serving)
Eating fatty fish 2-3 times weekly provides adequate omega-3s for most people.
Plant-Based Sources
For vegetarians and vegans:
- Flax seeds (2.3g ALA per tablespoon ground)
- Walnuts (2.5g ALA per ounce)
- Chia seeds (5g ALA per ounce)
- Hemp seeds (3g ALA per ounce)
While these provide ALA, conversion to EPA and DHA is limited. Plant-based individuals may benefit from algae-based supplements.
Supplementation
Fish oil supplements provide concentrated EPA and DHA. Choose quality supplements that have been tested for contaminants. Typical recommendations for cardiovascular benefit are 1-2g combined EPA and DHA daily.
Balance with Omega-6
Western diets are high in omega-6 fatty acids relative to omega-3s, promoting inflammation. Rather than reducing omega-6 dramatically, focus on increasing omega-3 sources to improve the ratio.