Allow me to apply some knowledge onto this particular conundrum. If you attempt to consume yourself completely you would die in the process, but for the sake of this we will say that hypothetically if you were to consume without the horrors of "die" you would disappear. The reason for this it because in order to grow, you need to eat more to gain more. Since you are eating yourself, you will be the same mass you were when you have not consumed yourself. BUT you would also not disappear because you would only be digesting yourself and are only changing your physical state. which would be death.