[JR1427]

A large living meatball wont be able to stay alive.

It would need a circulatory system, to get oxygen in to it, and waste products out.

As others have pointed out, it would also be very prone to infection, without a protective outer later (skin), and specialised cells that will destroy pathogens (immune system).

I could go on and on!

There is a reason why giant meatballs didn't evolve.