I have just read The Obesity Code by Jason Fung. This is not going to be so much a review as much as a reflection on the text, weight loss and wellness in general. I am sure I won't do justice to the book so I highly recommend you find yourself a copy and give it a read!
The author makes an interesting and compelling case. Weight loss is an hormonal problem and not a calorie imbalance problem. The main hormonal culprit being insulin. He defines obesity as persistent high blood insulin levels coupled with a state of insulin resistance.
Calorie imbalance is the proximal cause of obesity. More energy stays in the system then leaves therefore one gets fat. The distal cause is the aforementioned hormonal imbalance that make it near impossible to maintain calorie balance.
The solution is twofold: