There’s one villain you need to watch for: mold. If you see fuzzy green, blue, or white spots, that’s a red flag.
Mold on peanut butter can sometimes produce mycotoxins, which are the real troublemakers. These can cause allergic reactions or make you feel pretty crummy.
But here’s the kicker: mold needs oxygen and moisture. A sealed, commercial jar is a terrible environment for it. If you see mold, it usually means you introduced it with a dirty knife.
Expired Peanut Butter: Risks Of Eating It And When To Toss | CyButter
Pro tip: Always use a clean, dry spoon. Don’t double-dip with a knife covered in jelly or breadcrumbs. You’re basically inviting unwanted guests.
The Texture Time Bomb
Have you ever opened an old jar and found it dry and crumbly? That’s the oil separating and the solids settling. It’s not dangerous, just sad.
You can try stirring it back together, but it’s like trying to uncook an egg. The texture is shot, and your sandwich will feel like eating sawdust.
Compare it to a forgotten chocolate bar. It might get white bloom on it, but it’s still safe to eat—just less enjoyable.
