Is Peanut Butter Rancid?
Peanut Butter Can Go Rancid in About a Year and Lose Its Flavor. While Fungi and Bacteria Won't Ruin Your Peanut Butter, Oxygenation Eventually Will. the Axiom...
Peanut butter can go rancid in about a year and lose its flavor. While fungi and bacteria won't ruin your peanut butter, oxygenation eventually will. The axiom that tasty foods are fatty foods is certainly true in the case of peanut butter.
How can you tell if peanut butter is rancid?
Signs that your peanut butter has gone bad include a change in texture to dry and hard; changes in aroma, including a loss of aroma; and a more sour or bitter taste.
Why store bought peanut butter is bad?
How do you know if peanut butter is bad? You won't find mold growing on it, but its high fat content means it can go rancid. (That's the same reason we don't recommend buying cooking oil in bulk.) Oxygen is the enemy here, and exposure to air can cause your peanut butter to develop off flavors.