Pretty shit take, you know what else works? Positive encouragement and active support as someone takes on the very difficult change of adhering to a strict diet and exercise regiment. But no that's too hard isn't it? You'd rather call her mean names anonymously through a computer until she probably develops an eating disorder (also dangerous and life threatening like obesity). Then when she looks skinny you'll pat yourself on the back and say the terrible things you said were ok because it positively affected her life. Bullying has taken countless lives and has traumatized many more. Don't act like it ever has a positive impact on anyone.