Findings from the state of Maine illustrate the latter problem.  Relative to individuals without SMI, Maine Medicaid beneficiaries diagnosed with serious mental health conditions (fiscal year 2004) experienced significantly higher rates of medical illnesses:

       SMI     non-SMI

   skeletal      59%     ~43%
   gastrointestinal     33.9%     ~20%
   obesity/high lipids   30%       20%
   COPD     28.6%     ~18%
   hypertension     22.8%     ~18%
   diabetes     17.4%       10%


Sources of data:
Freeman, E. and Yoe, J.T. The Poor Health Status of Consumers of Mental Healthcare: Behavioral Disorders and Chronic Disease, Presentation to NASMHPD Medical Directors Work Group, May 2006;Yoe, JT and Freeman, E.  (June 19, 2009).  The Interdependence of Mental Health and Physical Health. Presented at the SAMHSA National Grantee Conference – Washington, DC; and NRI (summer 2008), “Using Data, Changing Practice.”