hello...new here .I find the whole waterfasting thing very interesting, just wondering is it safe and does it actually work. Oh and I want to try it out I need to loose about 15 - 20 lbs, but can i still drink coffee?I love my coffee I drink it with skim milk and no sugar.my current weight is 140 Im 5ft3, do you think I can get down to at least 125 by Christmas?