"You don't call out (sick) unless you're on your deathbed," says freelance chef Leah Grossman. Indeed, according to a recent study, 58% of salaried New York City restaurant workers reported going to work when sick; the number is even higher for those without benefits.

"A lot of poor, transient people work in restaurants," says Peter Francis, a co-author of industry exposé "How to Burn Down the House." "They're not giving up the $100 they'd make in a shift because they're sick."