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Pritikin, Nathan (29 August 1915–21 February 1985), inventor and nutritionist, was born in Chicago, Illinois, the son of Jacob Pritikin, an outdoor sign salesman, and Esther Leavitt. Nathan’s nurturing parents supported and encouraged their enterprising son. In 1933 he enrolled in the University of Chicago. The ambitious student also owned Flash Foto, a prosperous photography business. In 1935 Pritikin withdrew from college and made a fortune inventing technical gadgets....