Parathyroid response to vitamin D insufficiency: relations to bone, body composition and to lifestyle characteristics

Clinical Endocrinology
Lars RejnmarkLeif Mosekilde

Abstract

Vitamin D insufficiency is very common and is known to cause secondary hyperparathyroidism (SHPT). However, in some subjects the PTH response to low vitamin D levels is blunted, which has been termed functional hypoparathyroidism (FHPT). We compared indices of calcium homeostasis, bone metabolism and body composition in subjects with differential PTH responses to low vitamin D levels. Cross-sectional study. In 405 recent postmenopausal women with vitamin D insufficiency, we compared levels of bone turnover markers, bone mineral density (BMD), body composition, and body weight between subjects with SHPT and FHPT. Plasma 25-hydroxyvitamin D (P-25OHD) levels were slightly higher (P < 0.05) in SHPT compared with FHPT. SHPT was associated with higher levels of osteocalcin and bone-specific alkaline phosphatase, whereas whole body BMD and hip- and lumbar spine-BMD were significantly reduced. Subjects with SHPT had a 7% (P < 0.01) higher body weight and a 23% higher fat mass (P < 0.01) than subjects with FHPT, whereas lean tissue mass did not differ between groups. In SHPT, fat mass was increased by 14% (P < 0.001) at the upper and lower extremities and by 33% (P < 0.001) at the trunk. In a regression model, significant predictors of ...Continue Reading

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