you will loose some of the mass. it is mostly water, but mentally thats where you have to be strong. you can not be a slave to the scale. i do not even use my scale anymore. sometimes i look in the mirror and i say **** i look ****ing great, then i jump on the scale and find out i lost 1 pound...suddenly i look like **** in the mirror. it's all in the mind throw the scale out, it means nothing. and 10 lbs of water means even less.