Fat is now recognized as a metabolic organ. Leptin is the primary hormone secreted by fat cells, as fully explained in The Leptin Diet. A companion hormone that is also secreted by fat cells is called adiponectin. Adiponectin maintains insulin sensitivity, especially in the liver. When leptin resistance sets in and an individual gains weight, adiponectin levels drop. As they drop a person becomes insulin resistant, thus setting the stage for eventual diabetes.

A new study shows that adiponectin levels and mood are directly linked. Individuals having a psychotic stress attack (mood melt down) have the lowest levels of adiponectin. Apparently there are not as many jolly overweight people as we have been lead to believe. Obesity can now be considered a prime risk for serious behavioral issues. Nutritionally managing the hormone leptin is an important link to a healthier mood.