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“Gulp” by Mary Roach: A great read about the odd science of the digestive system
http://amzn.to/1U4i2N7 (Public library: http://www.worldcat.org/oclc/811599508)
Carpenter, Guy H. "The secretion, components, and properties of saliva."Annual review of food science and technology 4 (2013): 267-276.
Perry, George H., et al. "Diet and the evolution of human amylase gene copy number variation." Nature genetics 39.10 (2007): 1256-1260.
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