I have found the article, hope it helps !

Why we work so hard, but nothing seems to change...
A biologist at Berkeley shared something very revealing on the low-carb BBS system
about 4 years ago that helps us all through the erratic weight fluctuations you invariably
encounter:

Fat cells are resilient, stubborn little creatures that do not want to give up their actual
cell volume. Over a period of weeks, maybe months of "proper dieting", each of your fat
cells may have actually lost a good percentage of the actual fat contained in those cells.

But the fat cells themselves, stubborn little guys, replace that lost fat with water to
retain their size. That is, instead of shrinking to match the reduced amount of fat in the
cell, they stay the same size! Result - you weigh the same, look the same, maybe even
gained some scale weight, even though you have actually lost some serious fat.

The good news is that this water replacement is temporary. It's a defensive measure to
keep your body from changing too rapidly. It allows the fat cell to counter the rapid
change in cell composition, allowing for a slow, gradual reduction in cell size. The problem
is, most people are frustrated with their apparent lack of success, assume they have
lost nothing, and stop dieting.

However, if you give those fat cells some time, like 4-6 months, and ignore the scale
weight fluctuations, your real weight/shape will slowly begin to show. The moral of the
story - BE PATIENT! Have faith! YOUR APPEARANCE AND SCALE WEIGHT MAY
FLUCTUATE, EVEN BACK-TRACK, BUT YOUR RESOLVE, COMMITMENT AND FAITH
SHOULD NOT!