title: [Type 2 diabetes mellitus and depressive symptoms: what is the cause of what? A systematic literature review].
abstract: BACKGROUND
  Diabetes mellitus type 2 and depressive symptoms are statistically associated. The question is if one of the two diseases is causal for the other.
  
  
  METHODS
  Systematic review using Medline and searching for prospective controlled population based observational studies and meta-analysis in English or German language.
  
  
  RESULTS
  Patients with type 2 diabetes have a higher incidence of depressive symptoms - compared to patients having no diabetes. And patients with depressive symptoms have a higher incidence of type 2 diabetes; however the findings for the first relation are only weak.
  
  
  CONCLUSIONS
  Knowing about this - even causal - co-morbidity is important in care, including a routine diagnostic approach to find out if the other disease is also present.
authors.affiliation: Abteilung für Allgemeinmedizin, Heinrich-Heine-Universität, Universitätsklinikum Düsseldorf.
authors.forename: G
authors.initials: G
authors.lastname: Wagner
authors.forename: A
authors.initials: A
authors.lastname: Icks
authors.forename: B
authors.initials: B
authors.lastname: Albers
authors.forename: H-H
authors.initials: HH
authors.lastname: Abholz
mesh_terms: D015897:Comorbidity; D003863:Depression / Q000150:complications* / Q000453:epidemiology; D003924:Diabetes Mellitus, Type 2 / Q000150:complications* / Q000453:epidemiology / Q000523:psychology; D006801:Humans; D015994:Incidence; D012307:Risk Factors