We just had a study on cells in my Anatomy class... the only time we build new adipose cells is as a baby and puberty...they never leave unless they are surgically removed or lipo-suctioned out...they just collapse as we lose weight and fill back up if we gain...they can fill with water when we first lose weight and that is what causes the whoosh of weight loss... I have just experienced this myself... stayed right on plan with no loss for over 2 week other than 1 pound and then had 3 pounds leave in the past 2 days.... it happened one other time since I began this WOE in April of this year... then I went down 5 pounds in 2 days after not losing for close to 3 weeks....both time, especially this last time.... I went down inches without the scale budging and my clothes got looser.