What happens when you don't eat?

Answer 1

You die, if you stop eating all together. If you are asking about fasting, in many cases this can be very good for you. The human body was designed to be able to withstand periods of being without regular food.

Answer 2

Your body starts using your muscles for energy, including your heart, and eventually you can die of it.
your body will shut down and you will die

then you will be buried in the graveyard. or at the hospital.