Pulled my beef roast out of the slow cooker and saw these weird white stringy things poking out of the meat. They look like little worms or parasites. Is the meat infested?

Parasites, on the other hand, would appear as distinct, separate entities embedded within the meat. They typically have a more uniform shape and are not as easily broken apart. Additionally, parasites are rare in commercially sold beef due to stringent inspection and safety measures.

While the white strings themselves are usually harmless, there are other indicators that can tell you if your meat is spoiled. Check for an off-putting odor; fresh beef should have a clean, slightly metallic smell. A sour or rancid smell is a red flag.