The food industry uses these special bags, he said, to extend the product's shelf life. In this case, the quality and the safety have no relationship. The product can look really good and be bad for you. In this case, Brackett said, spoilage also works to the consumer's benefit. If the product's bag says 'Use by Oct. 20,' use it by that date.
Some pathogens can grow at refrigerated temperatures.
The longer you keep the product, the more chances the harmful bacteria have to grow in populations.