Hi,
You can lose weight by eating just meat BUT it isnt a healthy way.If u go for a diet like atkins you can eat alot of meat but what u are trying to do is an extreme of atkins.it can put your life in jeopardy,i know a man who ate just eggs cheese and meat in a desperate attemp to lose weight mind it he had 200kgs to lose. and he fell really sick and couldn't stick to his diet so moderation is a key.
HTH