If you observe the natural cycle of the body, you will find that there is something called a mandala. A mandala is a cycle of forty to forty-eight days that the human system goes through. In every cycle, there will be three days on which your body does not need food. If you are conscious of how your body functions, you will become aware that on a particular day the body does not require food. Without effort, you can go without food on that day. Even dogs and cats have this awareness; on a particular day they often choose not to eat.