The Obesity Code is a groundbreaking book by Dr. Jason Fung that explores the root causes of obesity and provides practical solutions for weight loss. Dr. Fung challenges traditional beliefs about diets and calorie counting, instead focusing on insulin as a key factor in weight gain. By understanding how insulin affects our bodies, readers can learn how to effectively lose weight and improve their overall health. The book offers a comprehensive guide to intermittent fasting, meal planning, and healthy eating habits to help readers break free from the cycle of obesity and achieve lasting results.