“After the fourth or fifth day of dieting the daily loss of weight begins to decrease to one pound or somewhat less per day, and there is a smaller urinary output. Men often continue to lose regularly at that rate, but women are more irregular in spite of faultless dieting. There may be no drop at all for two or three days and then a sudden loss which reestablishes the normal average. These fluctuations are entirely due to variations in the retention and elimination of water, which are more marked in women than in men.”

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Also stalls happen and discusses reasons for stalls and solutions: http://www.miracleskinnydrops.com/2011/04/12/stalls-happen/