This article is fascinating and hideous simultaneously. The science regarding addictive aspects of human physiology is fascinationg; the exploitation of this knowledge by the food industry is shameful and criminal. This
very long article is excerpted from a forthcoming book.
http://www.nytimes.com/2013/02/24/magazine/the-extraordinary-science-of-junk-food.html?hpw&_r=0&pagewanted=print