In this article, the use of light therapy was shown to fight depression. I would suggest consideration of the possibility that the light therapy also increased the levels of vitamin D in these patients.
Patrick Albright Cresson, Pa.
A review published last year by the Cochrane Library also found evidence that bright-light treatment is effective against depression. The review indicated that light treatment might be useful even for patients with serious nonseasonal depression.
Daniel F. Kripke University of California, San Diego
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