If I eat my whole self will I become twice my size or disappear completely?
if you could of course.
I think you would remain the same size you are in right now. There is no way you can eat the whole self in a single serving. You can maybe take like twenty servings to finish up everything.
Technically you would still be the same mass, or at least a bit under it, pending on the amount of time it takes to actually eat yourself.
This question got me thinking (as disgusting as it is) & I still don't know the answer.... I don't think you can eat yourself though. I feel sick...
I don't think your mouth would be big enough... ;)
You would eat a portion of yourself and then die from shock and loss of blood.