Leptin, as opposed to lipten, is a hormone which is produced in
adipose (fat) tissue.  It is involved with regulation of body weight.
 The release of leptin has been found to be greater in obese adults
and has been noted be decreased during fasting.

In Sweden, Leptin levels in a group of exclusively breastfed newborns
were followed.  Levels were found to positively correlate with amount
of fat tissue and negatively correlated with amount of weight loss (in
other words, the more weight lost the lower the leptin levels, over
time).  The reference is: Pediatrics March 1998;101:429-32.

Danny Hirsch, MD, FAAP, CLC
Director, Lactation Institute of Westchester
Division of Newborn Medicine
Westchester & Sound Shore Medical Centers
Assistant Professor of Pediatrics
New York Medical College
Valhalla, NY, USA
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