11 The total number of fat cells in your body remains constant once you reach adulthood. (discovermagazine.com)
However, as more leptin is produced by increasing numbers of fat cells, those same fat cells become less sensitive to the leptin they are working hard to produce, creating leptin resistance. (saragottfriedmd.com)
I actually don't the science behind this but, I would imagine there are a greater number of fat cells in these areas for storage. (liftingrevolution.com)