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Spoiler alert: How to read those ‘sell by’ and ‘use by’ labels on food

“Freezing is an excellent way to halt the aging process and extend the life of foods that might otherwise go bad or get thrown away,” says Tyler Lark, a food-waste researcher at Gibbs Land Use and Environment Lab at the University of Wisconsin at Madison. Frozen foods won’t go bad, because bacteria and other pathogens can’t grow in frozen temperatures.