Jason Fung Books

One of the book’s most provocative claims is that obesity cannot be fully explained by the familiar formula of “calories in, calories out.” Fung does not deny that calories matter in a physical sense, but he argues that this model is too simplistic to explain why people gain weight, struggle to lose...

From The Obesity Code

A central insight of The Obesity Code is that insulin functions as a major fat-storage hormone. Every time we eat, especially foods rich in refined carbohydrates and sugar, insulin rises. This hormone helps move glucose out of the bloodstream and into cells, but it also signals the body to store exc...

From The Obesity Code

An especially important idea in the book is that high insulin does not just cause fat storage; over time, it may also contribute to insulin resistance, creating a self-reinforcing cycle. Fung compares this process to the body gradually becoming numb to a signal that is constantly turned on. If insul...

From The Obesity Code

Perhaps the most liberating message in The Obesity Code is that obesity should not be viewed as a moral failure. Fung argues that excess weight is largely driven by hormonal signals and environmental conditions, not laziness, gluttony, or lack of character. This is a powerful shift because shame rar...

From The Obesity Code

A striking argument in the book is that many traditional diets fail because they rely on chronic calorie restriction without addressing hunger hormones or metabolic adaptation. Fung argues that when people cut calories while continuing to eat foods that stimulate insulin, they often end up fighting ...

From The Obesity Code

Fung emphasizes that health is shaped not only by what we eat but also by when we eat. This idea challenges modern habits of constant grazing, late-night snacking, and eating from early morning until bedtime. According to the book, each eating occasion triggers hormonal responses, especially insulin...

From The Obesity Code