A bloated milk carton could be totally harmless, or it could be a sign of spoilage. It's totally harmless when it's the result of air pressure changes due to altitude or temperature.

“It’s supposed to be clean when the carton’s assembled or the bottle is filled,” Schneider points out, and if something is amiss there, the carton could bloat and the milk unsafe to drink.

Mary Anne White is a Professor Emerita in the Department of Chemistry at Dalhousie University. If you are a typical Canadian milk consumer, you probably drink more than 60 litres of milk a year. It ...

Mary Anne White is a Professor Emerita in the Department of Chemistry at Dalhousie University. If you are a typical Canadian milk consumer, you probably drink more than 60 litres of milk a year. It ...