"i am not allowed to eat."
Translation:Απαγορεύεται να τρώω.
The να τρώω shows that it the forbidden thing is that "I eat".
For example, Απαγορεύεται να τρως would be "It's forbidden for you to eat" / "You are not allowed to eat".
But Μου απαγορεύεται να τρώω should work as well, stressing that "I have been forbidden to eat" or "One has forbidden me to eat".