No you are wrong. In order to get there (build successful brand) you have to take care of your self. With coding marathons, buckets of coffee and fast food (because "I don't have time to cook") you will end up with heart attack before you achieve what you planned.
Not only that but adequate sleep, regular exercise and healthy eating contribute enormously towards healthier cognition. As a developer, I tend to find myself far more productive and successful in a shorter period of time when I am living on the healthy side of things. Everything that is me just works better when I go for a run three days a week, eat clean foods and get in a solid 8 hours of rest a night.