Effect of Increased Free Fatty Acids on Leptin Function

Obese people have elevated levels of the hormone leptin. Despite this, they seem to be resistant to the effects of this hormone, which usually regulates appetite and energy expenditure. This is similar to what happens with insulin levels in the obese. Furthermore, the way lipid ingestion versus lipid infusion may impact novel molecules secreted by tissues commonly affected in insulin resistant states such as liver and muscle have not yet been studied. The aim of the present study is to investigate the effect of oral vs. different doses of IV lipid administration on molecular parameters related to glucose and energy homeostasis using a randomized, placebo-controlled design. Additionally, we will examine how increased free fatty acids (FFAs) my impact intracellular leptin signaling such as the STAT3 pathway.