What are tips on becoming anorexic?

Don't become anorexic. Anexoria and Bulimia are eating disorders. They are generally found in people, more often women, with more deeply seated issues that could be approached with counseling and/or medical attention.

Looking for advice on how to have a life threatening condition is not a good approach. Pleaes seek professional help immediately. Permanent body damage and death are more common outcomes of anorexia than anything positive.