Summary of The Obesity Code by Jason Fung Includes Analysis Preview: The Obesity Code addresses the history, causes, and treatments of obesity and today's rising obesity rates. By understanding it through scientific and social study, obesity becomes less of a blanket term for metabolic complications and a more tangible problem with real, though not widely practiced, solutions. The main problem with treating obesity is that many doctors and their obese patients don't know what actually causes obesity. Often, health experts believe that weight gain results from consuming too many calories while not expending enough calories, a theory known as "calories in, calories out." However, decades of research has proven that this obesity model is problematic and oversimplified. Calorie consumption and expenditure are not independent of each other. If people decrease calorie consumption in an effort to lose weight, their body compensates by slowing down processes such as metabolism to expend fewer calories. Also, exercise is not nearly as instrumental in weight loss as was once thought... PLEASE NOTE: This is key takeaways and analysis of the book and NOT the original book.