Fast fix or recipe for disaster?

It's caught the attention of Hollywood with a flurry of tweeting, writing and broadcasting, with Ben Affleck, Jennifer Lopez and Beyoncé shouting about its success, but is the latest diet fad from the UK a quick fix or a dangerous liaison for patients seeking weight loss?  

Despite its growing popularity, the Fast Diet, which is less about what you eat and more about not eating at all, has been the subject of controversy worldwide, especially among eating-disorder and nutrition