<prompt> The primary action of leptin is:To increase food intakeTo decrease food intakeTo increase gastric contractionTo increase intestinal motility  <response>: LEPTIN It is a 167 aa peptide secreted from adipocytes, blood leptin level reflects total body fat. Its primary action: To decrease food intake. It in CNS decreases NPY and alpha MSH. Leptin deficiency may lead to obesity. Ref: Sleisenger and Fordtrans, Edition-9, Page-8. 