As an Instagram diet war heats up, I wonder, could I be the next Diet Diva? Tuesday night my friend Kristine who blogs at www.dressformfriends.com texted me the article The Great Diet Crash with the message “You need to write about this scandal!!!!”. The diet in question is The F-Factor Diet, an apparently well-known juggernaut of a weight-loss program based in Manhattan and headed by a model-thin, model-beautiful registered dietitian. I had never heard of it or her. But I wa