You raise an eyebrow and decide to pursue this line of dialogue further.
"So....eating is a waste of time?"
The others at the table are looking remarkably sickly, the more you think about it. They certainly aren't getting much Vitamin A, and Vitamins B through E are looking suspect.
The tallest, and arguably gangliest of them all responds. You can't seem to take your eyes off his Marilyn Manson t-shirt. So THEY'RE the ones that buy those records...you always wondered.
"I eat at dinner. I don't need to eat lunch in the cafeteria like I'm part of the machine, dude. Screw that."