Comment by hentrep

Here’s the actual USDA article describing the difference between “sell by, “use by”, and “best by” terms: http://www.fsis.usda.gov/food-safety/safe-food-handling-and-...

I don’t have time to find a source that supports this, but I understand that these dates also refer to the durability of the “food safe” container/packaging. Ever drink water from an unopened plastic bottle that has been stored for awhile? That taste is not from the water decaying or otherwise breaking down.