This English sentence is ambiguous:
He ate his food.
The word his can refer to the He at the start, or another man.
Él comió su comida.
Does the ambiguity still remain or does su always refer to the Él. If ambiguous, is this the proper way to resolve the ambiguity?:
Él comió su propia comida. (his own)
Él comió comida de otra persona. (someone else's)
EDIT - propio is now propia (thank you Javi)