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What foods are good sources of DHA?
Cold water, fatty fish such as cod, salmon, mackerel, sardines, trout and albacore tuna are excellent sources of both DHA and EPA. Fish oils, such as cod liver oil, are also rich in these omega-3 fatty acids. Chicken meat and chicken eggs can be good sources, too, since many chickens are raised on feed consisting of fish.
Many people find the pungent odor of rotting fish to be very unpleasant. In fact, this characteristic "fishy" smell comes from rancid DHA. Recall that DHA is very unsaturated, so it is very susceptible to free radical damage. Such molecular damage is the microscopic reason why fish spoils, resulting in the pungent fishy stench. That is also why you should be very careful in eating only the freshest fish possible. Even the heat of cooking fish will destroy much of this delicate fatty acid. If that bottle of cod liver oil smells too fishy, throw it out and buy a new one. Fresh fish oil has almost no odor whatsoever, and only a slight after-taste.
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