“'Too much sugar' might be the simplest explanation for the many obesity-linked cancers, but it is not a simple explanation. It is an idea built upon more than a century of science," Sam Apple explains in this excerpt from Ravenous: Otto Warburg, the Nazis, and the Search for the Cancer-Diet Connection. Here, Apple highlights key moments in that century of science, focusing specifically on how sugar and other rapidly digested carbohydrates spike insulin and insulin, in turn, "activates the pathways linked to cancer."