This latest study rules out the use of SSRIs as a possible cause of osteoporosis, but suggests that an imbalance in the immune or inflammatory systems in women with depression may be to blame.
For the study, the rates of bone loss was examined using x-ray absorptiometry in 89 women who had been diagnosed with mild depression, or had recently suffered a depressive episode, and 44 women without depression. All were aged 21 to 45.
The two groups were similar for all other osteoporosis risk factors.
Over the course of the two-year study, the researchers found that 17 per cent of depressed women had thinner bone in a vulnerable part of the hip called the femoral neck, compared with only 2 per cent of those without depression.
Low bone mass in the lumbar spine was found in 20 per cent of depressed women, but in only 9 per cent of the control group.
Blood and urine samples revealed that depressed women had higher concentrations of pro-inflammatory cytokines and tumour necrosis factor alpha and lower levels of anti-inflammatory factor IL-13, compared with healthy women.
The researchers propose that the imbalances in the levels of inflammatory substances may cause osteoporosis in depressed women.
Archives of Internal Medicine website
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