I can't speak for others but I can tell you mine and my husbands experience on our 8 day fast. I lost a total of 14.6 pounds in 8 days and my husband lost a total of 21.4 pounds in 8 days.
Through the years whenever we go on any kind of diet or fasting he has always lost more weight than I have. I chock this up to the fact that he is larger than I am to start with and also that I've always heard that men lose faster than we do. I don't think its fair but it seems to be a fact.