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National Weight Control Registry (NWCR). Brown University and the University of Colorado, 1993.

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Deep Nutrition: Why Your Genes Need Traditional Food. Dr. Catherine Shanahan, Big Box Books, 2008

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Weeks, David & Jamie James. (1998). Secrets of the Superyoung. New York: Berkley Books.

The Happiness Advantage, Shawn Anchor, Random House, 2010.