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Fish oil is widely sold in capsules containing a mixture of omega−3 fatty acids, including EPA and DHA. Oxidized fish oil in supplement capsules may contain lower levels of EPA and DHA. [46] [47] Light, oxygen exposure, and heat can all contribute to oxidation of fish oil supplements.
Mammals are unable to synthesize omega−3 fatty acids, but can obtain the shorter-chain omega−3 fatty acid ALA (18 carbons and 3 double bonds) through diet and use it to form the more important long-chain omega−3 fatty acids, EPA (20 carbons and 5 double bonds) and then from EPA, the most crucial, DHA (22 carbons and 6 double bonds). [2]
The longer-chain EPA and DHA are only naturally made by marine algae and phytoplankton. [4] [5] The microalgae Crypthecodinium cohnii and Schizochytrium are rich sources of DHA, but not EPA, and can be produced commercially in bioreactors for use as food additives. [88] Oil from brown algae (kelp) is a source of EPA. [89]
DHA, an important omega-3 fatty acid, is found concentrated in mammalian brains. For example, according to Nutrition Data, 85g (3 oz) of cooked beef brain contains 727 mg of DHA. [ 7 ] By way of comparison, the NIH has determined that small children need at least 150 mg of DHA per day, and pregnant and lactating women need at least 300 mg of DHA.
The U.S. Food and Drug Administration (FDA) now classifies eggs as a “healthy, nutrient-dense" food, according to a new proposed rule. Registered dietitians react to the change.
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Instead, Dr. Danda offers up these phrases: “Happy you’re home,” “Glad you’re back,” or “I’m happy to see your smiling face.” “Parents can also make observations about ...