The Case Against Sugar

Gary Taubes builds a case, explicitly modeled on a prosecutor's brief rather than a balanced scientific review, that sugar — sucrose and high-fructose corn syrup specifically — is the primary cause of obesity, type 2 diabetes, and a long list of related chronic diseases, rather than simply one contributor among many alongside inactivity and general overeating. His mechanism centers on insulin: sugar consumption drives insulin secretion, and Taubes argues chronically elevated insulin is what actually signals the body to store fat and eventually drives insulin resistance, rather than the reverse. He backs this with a sweeping history — of the sugar and tobacco industries' overlapping economic interests, of researchers who spent decades blaming dietary fat instead of sugar for heart disease, and of populations like the Pima, who developed epidemic rates of diabetes within a generation of adopting a Western, sugar-heavy diet after centuries without it.

The book matters because it crystallizes an argument Taubes had been building across two earlier books into a single, more digestible indictment aimed at general readers and policymakers, and it landed at a moment when public suspicion of sugar (and of the food industry's past manipulation of nutrition science) was already rising. But its reception among nutrition scientists has been sharply divided, and readers deserve to know that clearly: many researchers respect Taubes's historical reporting on industry influence while rejecting his central causal claim, arguing that the evidence for sugar as a unique, singular driver of these diseases — independent of total calories, genetics, and other lifestyle factors — remains circumstantial and unproven, and that obesity and diabetes are better understood as multifactorial. Taubes himself has acknowledged his case is not proven beyond doubt, while arguing the stakes of large-scale chronic disease justify acting on the evidence he has.