title: Vitamin B(12) deficiency and depression in physically disabled older women: epidemiologic evidence from the Women's Health and Aging Study.
abstract: OBJECTIVE
  It has been hypothesized that adequate concentrations of vitamin B(12) and folate are essential to maintain the integrity of the neurological systems involved in mood regulation, but epidemiologic evidence for such a link in the general population is unavailable. This study examined whether community-dwelling older women with metabolically significant vitamin B(12) or folate deficiency are particularly prone to depression.
  
  
  METHODS
  Serum levels of vitamin B(12), folate, methylmalonic acid, and total homocysteine were assayed in 700 disabled, nondemented women aged 65 years and over living in the community. Depressive symptoms were measured by means of the Geriatric Depression Scale and categorized as no depression, mild depression, and severe depression.
  
  
  RESULTS
  Serum homocysteine levels, serum folate levels, and the prevalences of folate deficiency and anemia were not associated with depression status. The depressed subjects, especially those with severe depression, had a significantly higher serum methylmalonic acid level and a nonsignificantly lower serum vitamin B(12) level than the nondepressed subjects. Metabolically significant vitamin B(12) deficiency was present in 14.9% of the 478 nondepressed subjects, 17. 0% of the 100 mildly depressed subjects, and 27.0% of the 122 severely depressed women. After adjustment for sociodemographic characteristics and health status, the subjects with vitamin B(12) deficiency were 2.05 times as likely to be severely depressed as were nondeficient subjects.
  
  
  CONCLUSIONS
  In community-dwelling older women, metabolically significant vitamin B(12)deficiency is associated with a twofold risk of severe depression.
authors.affiliation: Epidemiology, Demography, and Biometry Program, National Institute on Aging, Bethesda, MD 20892-9205, USA.
authors.forename: B W
authors.initials: BW
authors.lastname: Penninx
authors.forename: J M
authors.initials: JM
authors.lastname: Guralnik
authors.forename: L
authors.initials: L
authors.lastname: Ferrucci
authors.forename: L P
authors.initials: LP
authors.lastname: Fried
authors.forename: R H
authors.initials: RH
authors.lastname: Allen
authors.forename: S P
authors.initials: SP
authors.lastname: Stabler
mesh_terms: D000367:Age Factors; D000368:Aged; D000369:Aged, 80 and over; D015331:Cohort Studies; D015897:Comorbidity; D003866:Depressive Disorder / Q000175:diagnosis / Q000453:epidemiology*; D006233:Persons with Disabilities / Q000523:psychology / Q000706:statistics & numerical data*; D005260:Female; D005494:Folic Acid Deficiency / Q000175:diagnosis / Q000453:epidemiology; D015577:Geriatric Assessment / Q000706:statistics & numerical data; D006801:Humans; D015995:Prevalence; D011446:Prospective Studies; D012044:Regression Analysis; D012307:Risk Factors; D012494:Sampling Studies; D012720:Severity of Illness Index; D012737:Sex Factors; D014806:Vitamin B 12 Deficiency / Q000175:diagnosis / Q000453:epidemiology*