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For those asking: NY times article extract: nytimes.com/2013/02/24/magazine/the-extraordinary-science-of-junk-food.html?pagewanted=all and book by Michael Moss: amazon.co.uk/Salt-Sugar-Fat-Giants-Hooked/dp/0753541459/ref=sr_1_1?ie=UTF8&qid=1363690461&sr=8-1