Food safety requires "thinking out of the box," David Acheson, assistant commissioner for food protection with the FDA, said at a meeting this week of the Institute of Food Technologists.
Acheson said consumers' expectations of safe food are also changing.
"Consumers demand a lot," said Acheson. "They are driving the global market and they want fresh, safe food 24 hours a day, 365 days a year."
He said the demand that lettuce be shredded, bagged and delivered is "adding a new dimension to potential food safety problems."