The work makes clearer who does and does not benefit from taking supplements of omega-3 fatty acids, the good oils found in fish such as salmon, tuna and sardines.

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Fatty acid content in vegetable oils can vary significantly, a spokeswoman for Spruce Naturals says, depending on factors such as differences in climate, soil, seed variety and how the oil is pressed.

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He searched for years and eventually lighted on a mixture of oleic acid (a fatty acid found in various vegetable oils) and nitrogen-containing compounds called amines.

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Soon it may order a disclosure as well about so-called trans unsaturated fatty acids, made from partially hydrogenated oils used to prepare a lot of junk food and said to be even worse culprits in artery-clogging.

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When it comes to fatty cakes and pastries, chewing gum, chocolates or oils, Harfouch has another trick up his sleeve.

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The American Heart Association recommends consuming both omega-3 fatty acids, found in cold-water fish like salmon and canola oil, and omega-6 fatty acids, found in nuts, seeds and vegetable oils such as corn oil.

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The Mediterranean diet discouraged soda drinks and the low-fat diet discouraged vegetable oils, nuts, fried snacks, visible fat in meats and soup, fatty fish and tomato sauce.

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