In fact, retail stores often discount red meat products that have changed color but are still safe and wholesome — and well within their shelf life. However, exposure to store lighting as well as the continued contact of myoglobin and oxymyoglobin with oxygen leads to the formation of metmyoglobin, a pigment that turns meat brownish-red.
Changes in color can be an indicator that the process is beginning, but color change alone does not mean the product is spoiled. A use-by date on a package can also be a good guideline.
How to tell if ground meat has gone bad
Here's How To Tell If Ground Beef Has Gone Bad
But, as my busy days go by, sometimes I'll forget about that package until I pull it out again Illustration for article titled If my ground beef has turned brown, should I put it And if you're within the date, you're probably good. it's within its use by date, bought 2 days ago and been in fridge since purchase. what happened? still safe to eat?