A facsimile reprint of the original can be found in this rare antiquarian book. It might have flaws like stains, notes, marginalia, and crooked pages due to its age. We have made this work available as part of our commitment to protecting, preserving, and promoting the world's literature in accessible, top-notch, contemporary editions that are faithful to the original work because we think it is significant from a cultural standpoint.This book is a reprint of two articles that Mr. Sinclair wrote for Cosmopolitan Magazine on the general topic of fasting for health. It also includes the most interesting of the many newspaper comments that they inspired, as well as the most significant letters that private individuals wrote to him asking for his advice and outlining their own experiments along similar lines. Additionally, there are excerpts from some of the author's Physical Culture Magazine articles, as well as articles responding to them and other replies in rebuttal.