A connoisseur of good food is known as a buongustaio (masculine, plural: buongustai) in Italian. It is made up of the following three parts:
buon (good) + gustare (to taste / savour) + aio (a suffix used to form agent nouns)
Unlike a mangione (a person who eats a lot) or a golosone (a person who cannot resist eating large quantities of certain kinds of foods), a buongustaio has a deep appreciation and understanding of good food but rarely overeats.
Lasciamo decidere al buongustaio che cosa ordinare.
Let the gourmet decide what to order.
An extended meaning of buongustaio is someone who is an expert judge in matters of taste.
Marco è un buongustaio in fatto di sigari.
Marco really knows his cigars.