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?

do not survive the cooking process, particularly at the temperatures used in slow cooking. If you’ve cooked your meat to the appropriate temperature, it’s very unlikely that any parasites could have survived.

2. Understanding Muscle Fibers And Connective Tissue In Beef

 

Muscle fibers and connective tissues are integral parts of any cut of meat. Muscle fibers are the actual ‘meat’ part of the muscle, while connective tissues hold these fibers together and attach muscles to bones. Beef contains a significant amount of connective tissue, which is largely composed of collagen.