Question: What's A Gastronaut?
By: Melissa Peterman
Published: January 14, 2010

I've heard this term before- I'm assuming it's an adventurous eater. Which I think I could consider myself as one.

Answers:
Euclydes Antoni...

It may be an adventurous eater, but I think that's a bit too obvious.
How about "a hungry astronaut"?  Or even better, "a sailing stomach", after all gastro = stomach and the suffix -naut = sailor.  I suppose a "sailing stomach" is a "stomach full of wind", i.e., "an empty stomach". Thus, gastronaut is someone who wants to have his/her stomach filled with food rather than with wind or air, or simply saying, "any hungry fellow", even if he/she is not an astronaut.  Hope that helps ;-)