Best way to back out of an insult

BAJA FRESH COUNTER DUDE:  You have enough food here to feed a small army
ME: haha...welllll, it's only for me.  Good thing I'm hungry!
BAJA FRESH COUNTER DUDE: Oh. I mean...well you're SO skinny.

Thank you Baja Fresh Counter Dude. Insult turned compliment, accepted.

And by the way, it was just 2 fish tacos and a side salad.  I find it hard to believe that 2 slivers of mahi and an amount of lettuce that fits in the cup of my hand, would satisfy a fleet of soldiers.