The reason meat has become Magnetic is that Graphene Oxide is being given to livestock in feedlots for a variety of claims, these claims are fictional as you the final consumer of the Meat are the Target for the Graphene Oxide.

https://duckduckgo.com/?q=livestock+feed+with+graphene&t=brave&iax=images&ia=images

https://duckduckgo.com/?q=livestock+feed+with+graphene&t=brave&ia=web