The Importance of Habits

Your brain uses up about 10 times its body weight in terms of energy. Because it can't storage energy, so the body can store energy in the form of fat, your brain doesn't have an energy storage capacity. Your brain is constantly trying to save energy and to be as efficient as possible. And that's why we have things like habits. Whenever your brain has to think about something and make a deliberate decision, use as much more energy than to do something that's already automatic. The safest thing in our evolutionary history would be to assume the worst.