Depression in Elderly Women Linked to Vitamin B-12 Deficiency
WebMD News Archive
The other option is that people with vitamin B-12 deficiency are more likely
to develop depression. Penninx feels there is no strong evidence for this
Jonathan E. Alpert, MD, PhD, of Harvard University, feels differently.
"We know that severe B-12 deficiency can lead to neurological symptoms, so
it's not implausible to think it can contribute to depression, even though that
association hasn't been very strong in previous [studies]," says Alpert,
who reviewed the study for WebMD. He notes, however, that the association
between the women's actual levels of B-12 and their depression was not very
strong in the current study.
Alpert says the study raises the awareness of both physicians and the public
that there may be an association between vitamin B-12 levels and depression.
"If one is severely depressed, you can have your B-12 levels checked,"
he says. "However, it won't tell you if taking B-12 would help or change
your depression. It tells you that you have a nutritional deficiency that
should be corrected."
Noting the 17% incidence of B-12 deficiency in the sample, Penninx agrees.
"In this [elderly, disabled] population, depression is common and vitamin
B-12 deficiency is common. If there's really a causal link between the two, we
should be screening for vitamin B-12 deficiency because it is easily
Alpert says that the study leaves open some important questions: Would
taking vitamin B-12 have prevented the depression, or could it treat the
depression? "It's a reasonable speculation," Alpert says.
Says Lon S. Schneider, MD, of the University of Southern California Keck
School of Medicine in Los Angeles: "There's absolutely no evidence from the
way this study was done that taking vitamin B-12 would prevent depression."
What the study does tend to show, he says, is something many physicians already
know: that depression in the elderly is often accompanied by other medical
Schneider says that normal doses of vitamins contain enough vitamin B-12 to
prevent deficiency, as does a normal diet. People who are deficient in B-12
despite eating well and taking a multivitamin need further evaluation.
"Treating B-12 deficiency isn't automatically giving vitamin
B-12, because some people may not be able to absorb it," he
Alpert says he often recommends that depressed patients take a multivitamin:
"One of the core symptoms of depression is that people eat poorly. Often
I'll advise people both to try to improve their eating habits in general and
take a multivitamin in the hope that will help, along with other treatments.
... It can't hurt."