Food and nutrition experts explain how long peanut butter lasts and how to tell if it's gone bad.
can last 6-9 months in your pantry and does not require refrigeration.An open jar of peanut butter, stored in the refrigerator"The best temperature to store peanut butter is in a cool, dry place, typically around room temperature ," advises Baker."However, once opened, storing it in the refrigerator can help extend its shelf life.
If you're an occasional peanut butter eater who still likes to have it in the house, when in doubt of how fast you may consume it, opt for powdered peanut butter, which lasts for a year, according to Wirtz.There are a few telltale signs that a jar of peanut butter has taken a turn for the worse. But the good news is that most of these can be deciphered with a little help from your five senses.
"Oxygen from the air can react with the fats in peanut butter to form aldehydes, which give metallic off-flavors and off-odors," explains Dr. Quoc Le."Moisture from the air, the peanut butter itself, or from transferring other spreads like jam into the peanut butter can speed up the hydrolysis of fats, which generate fatty acids. These compounds also exhibit negative flavor and mouthfeel.
"Higher temperatures and the presence of microorganisms that contaminate the surface of the peanut butter will accelerate these processes," adds Dr. Quoc Le."Incomplete roasting during the heat treatment process can allow native enzymes in the peanuts, known as lipoxygenase, to remain active and accelerate the fat oxidation process."
"Signs that peanut butter has gone bad include a change in smell, taste, or color," adds Baker."It may develop a rancid or sour smell, or the taste may be off. If you see any signs of mold or if the texture has become extremely hard or dry, it's best to discard the peanut butter."
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