I just bought this pack of ground beef from the store yesterday and put it in the fridge. I went to cook dinner and noticed the plastic film is puffed up like a balloon, but the date is still good. Wh

But the Date Is Still Good…
This is one of the most confusing parts for shoppers.

Food labeling can include:

Sell by date

Use by date

Best before date

These dates are not guarantees of safety. They are guidelines based on ideal storage conditions.

If at any point:

The meat was stored at an unsafe temperature

It sat too long in a warm car

The grocery store refrigeration fluctuated

Your fridge isn’t cold enough

Bacteria can multiply faster than expected — even before the printed date.

Ground beef is especially sensitive because grinding increases surface area, allowing bacteria to spread more easily.

Could It Be Something Else?
There are a few less common possibilities besides spoilage:

1. Modified Atmosphere Packaging (MAP)
Some ground beef is packaged using special gas mixtures (like oxygen or carbon dioxide) to preserve color and freshness.

If the seal weakens or temperature fluctuates, internal pressure changes could cause slight puffing.

However, noticeable ballooning is still not typical and should be treated cautiously.

2. Temperature Changes
If meat freezes slightly and then thaws, internal expansion and contraction can sometimes alter packaging tension.