I am very much with Lizzy on this one and I'll leave it at that.
I wrote just the sentence above, and then decided to share a bit more of my perspective on this...
I was anorexic (and skinny) many moons ago as a young adult (16-17 y/o) and doing so only gave me more food/weight/body image demons, as if that were possible! Now, for the first time in my life, food is not my issue. I am losing weight slowly, but I'm losing weight and feel better than I have in years despite still having a long way to go.
I don't know if being anorexic (I "lived" like that for a bit over a year before my family intervened) screwed up my metabolism or not; I'm 29 and it's harder to lose weight now than it was when I was younger, but I think that's just the nature of getting older.
So... just my 2 cents from my experience - unless you are under constant doctor supervision because you could literally die at any moment from being morbidly obese, I hardly think "VLCDs" (I think 'anorexia' is the more apt term) is a good idea.