Where does appetite come from?

Appetite and feather are of the same root, at least linguistically. “Craving for food,” from Anglo-French appetit, Old French apetit (13c.) “appetite, desire, eagerness,” from Latin appetitus “appetite,” literally “desire toward,” from appetitus, past participle of appetere “to long for, desire; strive for, grasp at,” from ad- “to” (see ad-) + petere “go to, seek out”.