In addition to activating the parasympathetic nervous system and stimulating eating behavior, the release of NPY and AgRP in the leteral hypothalamus and PVN suppresses the release of two pituitary hormones, thyroid-stimulating hormone (TSH) and adrenocorticotropic hormone (ACTH. TSH and ACTH both increase metabolic rate, so suppressing them slows the body's use of energy, allowing some of the nutrients taken in during feeding to be used to replenish the fat stores. Parasympathetic activity, feeding behavior, and TSH/ACTH suppression work together to allow an animal to find, eat, and store nutrients, As fat stores return to normal levels, more leptin is released, NPY and AgRP are less active, and the feeding cycle tapers off.