Effect of Antipsychotics on Appetite Regulation

Severe weight gain and glucose dysregulation are serious problems in patients treated with
second-generation ('atypical') antipsychotics (SGA). These side effects frequently interfere
with medication compliance and necessitate discontinuation of treatment. Although the causal
mechanisms for weight and glucose dysregulation are not well understood, one promising area
of investigation targets SGA-induced disturbances in appetite and in appetite-regulating
hormones. Findings from our group (and others) demonstrate SGA treatment-related increases
in fasting levels of the appetite-stimulating hormone, ghrelin, as well as increases in
self-report hunger. This novel study will examine prospective changes in ghrelin and in the
'satiety-signaling' peptide YY (PYY) as measured before and after participants consume a
standard mixed-macronutrient meal. Data are obtained at baseline (within 4 weeks of
beginning medication), and again 2 months and 4 months later.