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Adding fat-soluble vitamins A, D, E and K to Schwartz's brew didn't make sense, since beer is fat free.

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Fat helps with the absorption of fat soluble vitamins, of which vitamin E may be particularly important for brain health.

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We do need some fat -- it transports fat-soluble vitamins (A, D, E, and K), carries flavors and helps you feel satisfied after eating -- but look for monounsaturated and omega-3 types and avoid saturated and trans fats.

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To create the fuel, the researchers, who were funded by the oil company Shell and the Biotechnology and Biological Sciences Research Council, used a strain of E. coli that usually takes in sugar and then turns it into fat.

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Cottonseed oil is also the primary input in the production of Olestra, a frying fat that glides through humans without leaving a trace of fat or calories, and is also an important source of vitamin E for pharmaceutical producers.

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"More is not necessarily better...some vitamins and minerals can be toxic in high doses, " particularly the fat-soluble ones which the body stores like Vitamins A, D, E and K, explained Claire Williamson, Nutrition Scientist at the British Nutrition Foundation.

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