As one who both knows disease intimately, yet is immune to actually catching anything, Zack is about to argue that lots of things aren't meant for eating if a world is easy. But the stranger's question means he probably understands all that.

"I'm always hungry. And thirsty," he admits. "Sometimes it hurts, so I eat what moves. Or doesn't move fast enough." He would have taken some of his catch to the Waystation, but that seems irrelevant now.