I don't think any of us knows for sure if starvation hurts, other than the empty feeling we all feel when we haven't eaten for several hours....
I would guess thought , that it is not painful....
but starvation is cruel in that it takes a long time....maybe up two weeks...
My mother can tell you - she was a sharecropper's child during the depression, and she literally nearly starved to death. Yes, starvation hurts.