Food Safety Issues/Yogurt safety


Is it safe to eat yogurt if the lid is bulged if it looks ok? I know bacteria causes this effect, but is it the good bacteria that can create a bulged lid as well, or would it be just the bad bacteria?

Hi Janice,

When a yogurt container is swollen and the lid puffed,, this is an indication that the yogurt may have been improperly stored sometime during it's life.  

Sometimes, if fruit yogurt has not been properly refrigerated at the grocery store or in transit, the fruit can ferment and release gases. This would cause the lid to bulge.  While fermented fruit is not harmful to consume, it’s best to toss the yogurt. It may have an “off“ taste which would not be the tastiest to consume.

Yogurt does not support the growth of harmful (bad) bacteria as the pH of the product is too acidic for their growth.

If your yogurt is within the "best if used by date" I would contact the manufacturer as they will want to know about their product.  Chances are they will give you a coupon to replace this yogurt. If your yogurt is past the date, then I would definitely pitch the product.


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Carol Schlitt


I can answer questions on home food safety, sanitation and home food preservation.


I am a former Extension educator, nutrition, wellness and food safety, having retired August 1, 2010. I am a food safety instructor for the Illinois Department of Public Health, a ServSafe Instructor/Proctor and have my own company, Safe & Savory Solutions, Inc -

National Extension Association of Family and Consumer Sciences (Past President and current Historian), St. Louis Culinary Society.

BS - University of Illinois MS - Southern Illinois University at Edwardsville

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