Upton Sinclair was not only a prolifc and much admired author, but also a follower of Bernarr MacFadden's Physical Culture movement (see his Physical Culture Cook Book, 1901) and a member of the editorial staff of Physical Culture Magazine.
Dedicated to MacFadden, this volume advocates the benefits of systematic fasting in producing long-lasting health benefits.
This book is a reprint of two articles written by Mr. Sinclair on the general subject of fasting for health, as well as many testimonies from letter he received from people who tried fasting with fantastic results including results such as cures for a great number of diseases and ailments including cancer.
Mr Sinclair gives general outlines for fasting but at least that every person is biologically a little different and result vary from one person to the next.
Almost all results in the book are positive and the negative results seems to be from people who did not fast correctly or came off the fast incorrectly.