My friend did this before Xmas and lost 3 stone, now she has put back a stone even though she has been very good. Her memory went, she was tired all the time and her hair started to fall out. That being said she was glad she did it although she would'nt do it again. The process of the diet is sending your body into ketosis which the NHS website says is not advised for more than 2 weeks, so 100 days seems excessive. Oh and another thing, everytime my friend weighed herself at home or in Boots she always seemed to be 1/2 stone lighter than when the consultant weighed her.