I haven't eaten
I didn't eat yesterday.
I didn't eat much.
Non ho mangiato tutte le patatine perché erano troppo unte.
I didn’t eat all the fries because they were too greasy.
Non ho mangiato altro che pane e burro.
I ate nothing but bread and butter.
I didn't eat the hamburger.
Non ho mangiato nulla dall'anno scorso.
I haven't eaten anything since last year.
— Ирония судьбы, или С легким паром! (1976)
I didn't eat any rice.
I haven't eaten anything.
I didn't eat the bread.