A person with a keen appreciation for food.
For confirmation, just think of the millions of people who, after watching Keith, were inspired to cook, eat, drink; to become a gastronaut and savour — truly relish — every morsel, every drop, every bloody bit of it!
A person whose whole focus is narrowly directed to the enjoyment of fine food.
From gastro- + -naut, by analogy with astronaut.
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