From Dr. Mercola:
Mounting research drives home the importance of animal-based omega-3 fats for heart health. After reviewing this topic carefully, I am now convinced that maintaining a healthy level of docosahexaenoic acid (DHA) may be one of the most important food priorities.
DHA is a 22 carbon omega-3 fat from seafood. Omega-3 fats can be obtained from both marine animal and plant sources, but contrary to popular belief, they are NOT interchangeable.
Alpha-linolenic acid (ALA), an 18-carbon omega-3 fat found in plants like flax and chia seeds does convert to DHA, but typically less than 1 to 3 percent, which is nowhere near the amount you need for brain and heart health.
While plant and animal omega-3 fats are important for health, the animal-based DHA is the one most strongly associated with heart health and other important health benefits.
Additionally, DHA through its electron cloud, has the ability to turn light directly into DC electric current, which is particularly important for establishing your biological clock and circadian rhythm.
DHA and EPA Protect Your Heart Health
Recent research suggests eating fatty fish and other omega-3 rich foods, including certain plant-based sources, may lower your risk of a fatal heart attack (myocardial infarction) by about 10 percent.1,2,3 Taken AFTER a heart attack, omega-3 fats can also significantly improve your odds of survival.
One large trial found that heart attack survivors who took 1 gram of omega-3 fat each day for three years had a 50 percent reduced chance of sudden cardiac death.4 Another recent placebo controlled study5 found that high doses of omega-3 supplementation helps your heart heal after a heart attack.6,7,8,9,<sup …