Sorry, but Dr. Mao gets low marks for writing about fats, when he is, unfortunately, uninformed. This essay is full of errors. Fish oils are not mono-unsaturated, they are entirely polyunsaturated. Unsaturation refers to the presence of double bonds in the carbon chain of the fatty acid. Carbon chains are typically anywhere from 12 to 20 carbons long, with some examples outside this range, and they have anywhere from zero to 5 or so double bonds. Or 6 for DHA. See http://www.scientificpsychic.com/fitness/fattyacids.html for some examples. Or google fatty acids. To summarize, a monounsaturated fatty acid has one double bone, saturated have none, and polyunsaturated have more than one.
It is true that monounsaturated oils are healthy, but many polyunsaturated oils, like fish oils, are healthy, too. Super healthy, in fact. All essential fatty acids are polyunsaturated. All of them. Not a single one is monounsaturated. And omega-3 fatty acids are polyunsaturated.
It is also true that saturated fats are bad for you, but peanut oil contains a mixture of fatty acids, the minority of which are saturated. Peanut oil is never classified as a saturated fat. It is mostly a mixture of monounsaturated (oleic acid) and polyunsaturated (linoleic acid) fatty acids.
And true, polyunsaturated fats can have a high proportion of trans fats, but only if they have been subjected to catalytic hydrogenation, a process that makes polyunsaturated fats have a higher melting point (eg, margarine). Polyunsaturated fats of natural origin, not subjected to catalytic hydrogenation, do not contain trans fats.
So eat those fish oils! They contain essential polyunsaturated fatty acids, with no trans fat content. And eat that olive oil. It is high in monounsaturated fatty acids, And don't be afraid of peanut oil, although it's not as good for you as olive oil.
Don't you just hate it when someone writes about something, but fails to learn about it first?
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