The Hunger Code: Resetting Your Body’s Fat Thermostat in the Age of Ultra-Processed Food

Dive into the science of hunger and metabolic dysfunction with “The Hunger Code” by Dr. Jason Fung — essential reading for anyone trying to understand why eating less and moving more still isn’t working in a world built around ultra-processed food.

Dr. Jason Fung turns his attention in this volume to the way industrially processed food has been engineered to override the body’s natural hunger and satiety signals — and what that means for the millions of people who feel out of control around food despite their best efforts. He explains how ultra-processed products manipulate dopamine pathways, insulin response, and appetite-regulating hormones in ways that make overeating feel involuntary rather than chosen. Each chapter builds a clear picture of how the modern food environment works against the body’s fat thermostat — the biological system designed to keep weight stable — and what it takes to reset it. His approach combines the hormonal framework from his earlier books with practical strategies for navigating food choices in a world where the default is almost always processed.

Whether you are a patient, a clinician, a nutritionist, or simply someone exhausted by the cycle of dieting and regain, this book reframes the problem in a way that finally makes sense of the struggle — and points toward solutions that work with the body rather than against it.