Have you ever bought a package of ground beef that looked bright red on the outside, only to notice that the meat was gray or brown in the middle? It can be easy to assume something is wrong or that the store is trying to sell old meat. However, the difference in color is often completely normal and does not necessarily mean the beef is spoiled.

The color of ground beef is mainly affected by myoglobin, a protein found in muscle tissue. When the meat is exposed to oxygen, myoglobin creates the familiar bright-red color people associate with fresh beef. The outside of the package gets more oxygen, while the center gets very little, so the inside can naturally appear gray or brown. Once the meat is exposed to air, the color may change again.

Although color can be surprising, it should not be the only thing you use to decide whether ground beef is safe. Pay attention to other warning signs, including a strong unpleasant smell, a sticky or slimy texture, damaged packaging, or meat that has been stored incorrectly. These signs are more concerning than a gray center by itself.

After buying ground beef, refrigerate it as soon as possible rather than leaving it at room temperature. If you are not planning to cook it soon, freezing it is a good option. When kept refrigerated, ground beef should generally be cooked or frozen within one to two days.

Seeing gray or brown meat in the center does not automatically mean the store scammed you. In many cases, it is simply the result of how oxygen interacts with the meat. Instead of judging ground beef by its color alone, check its smell, texture, packaging, and storage history before deciding whether it should be used.