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Mechanisms of Osteoporosis in Adult and Adolescent Women with Anorexia Nervosa^*

Department of Medicine, Department of Psychiatry and the General Clinical Research Center, Massachusetts General Hospital Boston, Massachusetts 02114

Address requests for reprints to: Dr. Anne Klibanski, Massachusetts General Hospital, Boston, Massachusetts 02114.

Osteoporosis is a known consequence of anorexia nervosa (AN) in adults, but the mechanism of bone loss is not established, and there have been no studies of bone mass in women developing AN before attaining peak bone mass. To investigate the causes of bone loss in AN and to determine the consequences of developing AN during adolescence on bone mass, we compared the effects of AN on cortical and trabecular bone in 26 women with AN (19 adults, 18–42 yr old, and 7 adolescents, 14.9–17.0 yr old) using direct radial photon absorptiometry and both single and dual energy spinal computed tomography. The adult AN patients had marked spinal osteopenia [mean bone density, 120 ± 28 (±SD) mg K₂HPO₄/cm³] compared with age-matched normal women (mean, 176 ± 26 mg K₂HPO₄/cm³; P = 0.0001), which was severe (>2 SD below the normal mean) in 50% of patients. Adult AN patients with the onset of amenorrhea before age 18 yr had significantly (P = 0.04) lower spinal bone density than those developing amenorrhea later (mean, 103 ± 25 vs. 129 ± 25 mg K₂HPO₄/cm³) independent of other variables correlated with bone density (duration of amenorrhea or urinary cortisol excretion). We found a negative correlation between spinal bone density and duration of amenorrhea (P = 0.006; r = –0.53).

To determine the contribution of endogenous cortisol excess to the pathogenesis of the osteoporosis, urinary cortisol was measured. Urinary cortisol/creatinine clearance was significantly (P = 0.001) higher in AN patients than in normal women (mean, 2.7 ± 1.2 vs. 1.0 ± 0.3 nmol/L) and was negatively correlated (P = 0.03; r = –0.43) with bone mass. We conclude that AN affects trabecular bone and that both the onset of AN before attainment of peak bone mass and prolonged duration of amenorrhea result in more severe osteopenia. In addition to the significant contribution of hypogonadism, the cortisol excess that occurs in AN patients may contribute to the development of osteoporosis in these patients.

^* This work was supported in part by Grants HD-21204 and RR-01066 from the NIH.

Received June 20, 1988.

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