Why Are Some Food Packages Bloated? The Surprising Difference Between a Normal Bag of Chips and a Potential Food Safety Warning.

product instructions, and when in doubt, discard it.

Can bacteria make food packaging swell?

Yes. Some microorganisms can produce gases as they grow, which can cause pressure to build inside sealed packaging. However, swelling isn’t a universal indicator of harmful bacteria.

Does a lack of air mean food is safer?

No. Vacuum packaging can help preserve certain foods, but removing oxygen doesn’t eliminate all food-safety risks. Some microorganisms can grow in low-oxygen environments.

Should I open a swollen package to release the gas?

If you suspect a perishable food has spoiled, don’t open it simply to investigate or taste it.