Peptide YY (PYY) levels drop when adiposity levels rise, and a drop in PYY levels is linked to obesity. The correct answer is C. decreased PYY level.
Following food ingestion, proximal small intestine cells produce cholecystokinin (CCK). Its effects include reduced appetite, satiation, and insulin and pancreatic enzyme release. Obesity reduces CCK levels. The production of angiotensinogen (AGT), which is elevated in obesity, occurs in the liver and adipocytes. By balancing the conflicting actions of two sets of neurons, the arcuate nucleus (ARC) in the hypothalamus regulates how much food is consumed and how the body uses its energy.
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