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In his latest book, neurologist Perlmutter declares war on a common foodstuff, attributing a bewilderingly wide assortment of maladies to the consumption of gluten, a substance found in bread and other stock foods. Contrasting modern humans against idealized humans of the distant past, Perlmutter concludes that the former, whose average life expectancy at birth is about twice that of their Paleolithic ancestors, have gone off the proper track. Lauded by such nonconsensus pundits as Mehmet Oz and William Davis, Perlmutter offers readers a comfortably simplistic model for thinking about carbs.--Publisher's Weekly