In California, roughly one in three hospitalized people over 34 years old has diabetes, increasing the complexity and cost of their care, according to a report released Thursday. Hospitalizations for patients with diabetes on average cost about $2,200 more than for patients who didn't have the disease, regardless of the reason they were admitted, according to the report by the UCLA Center for Health Policy Research and the California Center for Public Health Advocacy. "Diabetes … affects most body systems in one way or another," said Harold Goldstein, executive director of the California Center for Public Health Advocacy and one of the authors of the study. "If you have diabetes, it's more challenging to treat anything."