Hi Kristina,
I let your message sit for a day to let someone else answer it. Since 
nobody has, leptin is a hormone that regulates appetite (among other 
things) primarily through a part of the brain called the hypothalamus. A 
condition of leptin resistance, similar to insulin resistance, is 
thought to be a contributing factor in obesity.

best wishes,
Ron

>>Thanks Ron...I did read a bit about it. Also read about leptin resistance
but got the impression leptin would be elevated if LR is an issue. I did
find articles indicating that low leptin levels could be a problem with
hunger signals or appetite control as you indicated in your second post.

Kristina