Some people are going to ding him for including exercise, and it's true that the physical calorie expenditure of exercise won't achieve much for weight loss unless you make cycling a major hobby. However, I think exercise goes a long way towards loosening the mental trap. It helps you build an identity as a healthy person, it relieves the guilt about not taking care of yourself, and it takes the edge off of emotions like anxiety. All of these things make it easier to avoid excessive eating. I don't think exercise is a must-have for everybody for weight loss, but I think more people should try it, and I think it gets overlooked because most of the claims about the calorie burn aspect of it haven't stood up.