You don't. Mangia bene is Italian. In English you say "eat well."
"Now eat! Who eats well lives well. I love you!" is an English equivalent of the Italian phrase Mangiare adesso! Chi mangia bene viva bene. Ti amo!Specifically, the present infinitive mangiare is "to eat". The adverb bene means "fine, good, well". The relative pronoun chi means "who". The verb mangia means "doest eat, eats, is eating" in this context. The verb viva means "does live, is living, lives" in this context. The personal pronoun ti means "(informal singular) you". The verb amotranslates as "(I) am loving, do love, love".The pronunciation will be "mahn-DJAH-rey ah-DESH-soh KEE MAHN-djah BEY-ney VEE-vah BEY-ney tee AH-moh" in Italian.
Eat well is the literal English equivalent of 'Mangia bene'. A looser equivalent is 'Have a good meal' or 'Enjoy your food'. In the word by word translation, the imperative 'mangia' means '[you] eat'. The adverb 'bene' means 'well'.
Abbastanza bene in Italian means "quite well" in English.
Well is a succinct English equivalent of 'bene'. In a good way is a less abbreviated English equivalent. Either way, the word functions as an adverb in a Latin sentence.
bene factum
Mangia happened in 2600.
Mangia was created in 1983.
John Mangia's birth name is John Michael Mangia.
Stai bene con i baffi? in Italian is "You're fine with mustaches?" in English.
Mangia bene! in the singular, Mangiare bene! in the singular and plural, and Mangiate bene! in the plural are Italian equivalents of the English phrase "Eat well!" Context makes clear whether one "you" (cases 1, 2) or two or more "you all" (examples 2, 3) suits even though experienced, native, and newbie language speakers tend to opt for the second-mentioned option. The respective pronunciations will be "MAN-dja BEH-ney," "man-DJA-rey BEH-ney," and "man-DJA-tey BEH-ney" in Italian.
Buon appetito, Mangia bene! and Mangiate bene! are Italian equivalents of the English phrase "Hope you enjoy your food!" Context makes clear whether "Good appetite!" (case 1) or "Eat well!" to one "you" (example 2) or to two or more "you all" (instance 3) suits. The respective pronunciations will be "BWO-nap-pey-TEA-to," "MAN-dja BEH-ney" and "man-DJA-tey BEH-ney" in Pisan Italian.
Yes, 'enjoy' may be the English equivalent of 'mangia' in the sense of 'enjoy [your meal]'. The Italian word also may be translated as the wish to 'have a good meal'. It's the singular command form of the infinitive 'mangiare', which means 'to eat'.