"I had taken several fasts of ten or twelve days' duration, with the result of a complete making over of my health." -Upton Sinclair, The Fasting Cure Upton Sinclair's The Fasting Cure (1911) consists of two essays in which Sinclair discusses the reasons he believes that engaging in regular fasts to remove toxins from the body is a healthy practice. While medically controversial, this book is considered worthwhile as an historical document of the "fasting fever," which occurred around the time of its writing.