Yes, peanut butter can go bad. Its high fat content makes it susceptible to rancidity.
Recognizing Spoiled Peanut Butter
You can easily identify rancid peanut butter through several key indicators:
- Off-putting Odor: A metallic, bitter, and stale smell is a strong sign of rancidity.
- Altered Appearance: The peanut butter may appear darker and drier than usual.
- Mold Growth (Natural Peanut Butter): Natural peanut butter, lacking preservatives, is more prone to mold growth.
While the provided reference mentions these visual and olfactory cues, it's crucial to remember that the expiration date is a guideline, not a guarantee. Even within its "best by" date, peanut butter can still spoil if not stored properly.
Factors Affecting Peanut Butter Shelf Life
Several factors influence how quickly peanut butter spoils:
- Storage Conditions: Improper storage, like exposure to heat, light, or moisture, accelerates spoilage.
- Type of Peanut Butter: Natural peanut butter, without added preservatives, spoils faster than commercial varieties.
- Opening the Jar: Once opened, the surface area exposed to air increases, speeding up the oxidation process.
By storing peanut butter in a cool, dark, and dry place and properly sealing the jar after each use, you can extend its shelf life.
