People with severe mental illness more likely to have Type 2 diabetes, shows study

People with severe mental illness are more than twice as likely to have Type 2 diabetes, with even higher risks among patients who are African American or Hispanic, according to a new study led by UCSF.

Among more than 15,000 patients with severe mental illness, 28.1 percent had Type 2 diabetes, the researchers reported in the study publishing June 13, 2018, in Diabetes Care. In contrast 12.2 percent of the general population are estimated to have the disease.

Among racial minorities with severe mental illness, the incidences were 36.9 percent for Hispanics, 36.3 percent for African Americans and 30.7 percent for Asians - versus 25.1 percent for whites.

The study, which was led by first author Christina Mangurian, MD, MAS, associate professor of psychiatry at UCSF, follows her previous research that linked severe mental illness to low levels of testing for diabetes, low rates of HIV testing--despite a significantly higher likelihood of being HIV positive--and, among women, low rates of screening for cervical cancer.

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"Antipsychotic medications prescribed for conditions like schizophrenia and bipolar disorder may cause weight gain and impact cholesterol levels and insulin resistance," said Mangurian, who is Vice Chair for Diversity and Health Equity in the

Prediabetes, in which blood sugar levels are elevated, was also found to be high among people with severe mental illness. Close to half were found to have prediabetes, versus an estimated one-third of the general population. The condition was more common among those who were minorities and tended to emerge as young as age 20, the researchers noted.

The study utilized a database of health information from patients with severe mental illness collected by Kaiser Permanente Northern California. The study included patients who were also in the Kaiser Permanente diabetes registry and assessed the prevalence of prediabetes by analyzing patients' hemoglobin A1C and fasting glucose levels.

"We were able to leverage Kaiser Permanente's extensive electronic health record data to improve our understanding of the burden of diabetes and prediabetes in people with severe mental illness and develop insights on how to address racial/ethnic and age disparities in this high-risk population," said senior author Julie Schmittdiel, PhD, research scientist at the Kaiser Permanente Northern California Division of Research.

"The results of the study indicate that we should be screening all patients with severe mental illness for diabetes," said Mangurian. "I view this as an opportunity to change how doctors think about health screening and to help prevent diabetes. By diagnosing prediabetes early, we can help patients make lifestyle modifications or start medicine so that they don't develop diabetes."

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