Are we liable for food poisoning that employee suffers while working out of town?

Q. We have a question regarding our crews that work out of town and stay out for about four days. Can we be held liable if they get sick on a meal that was paid for by the company? We are thinking about paying a per diem instead to resolve this issue. If an employee is working on a road crew and takes off sick and stays in motel room, are we required to supply him the meal per diem?