how many times do you have the bowels one day?

This is a very strange question. I have bowel movements at least twice a day as my diet consists of a lot fibers. I eat a lot of fruits and vegetables, nuts, etc. What I don't understand is how can you not eat? How can your body sustain itself without any food intake? It is unhealthy and your body will shut down at some point. Do you have a specific reason for not eating or is this something you decided to do in the spur of the moment?