NayB,
before undergoing a fast you should at least have done some rudimentary research into the subject.
I agree with the theme of the thread from the other posters: 50 days will most likely allow you to enter the starvation stage with a deficiency of electrolytes and insufficient muscle tissue in catabolizing some of this for amino acids to manufacture glucose, required by some organs during fat-burning (ketosis). Insufficient glucose from muscle can lead to cardiac arrest or heart-failure.
Fat is not the only food reserve that you live from on a fast.
Your very best way to lose weight, and lose weight PERMANENTLY is by adopting the NUTRITARIAN way of eating, where you can have virtually unlimited portions, and do not need to count calories.
You will also lose weight much more quickly than WOF because WOF will lower the metabolic rate. Click on the "SUCCESS STORIES" as well...................... http://www.drfuhrman.com/weightloss/default.aspx