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This volume is a survey of a five year experiment of diet and efficiency carried on at the University of Chicago. It provides a controlled experiment on fletcherization, indicating that overchewing decreased muscular endurance, typewriting accuracy and basal metabolism; that it had no significant effect on blood pressure, pulse, oral temperature, sleeping time, mental multiplication and typewriting speed. The book provides complete data concerning such factors as were investigated in the course of this study.
Diet and Efficiency: A Five-Year Controlled Experiment on Man.. JAMA. 1931;96(15):1257. doi:10.1001/jama.1931.02720410067047