Bryant H. Keirns , Christina M. Sciarrillo , Austin R. Medlin , Samantha M. Hart , Elyse M. Cronic , Sam R. Emerson
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Whole-body bone mineral density and markers of bone homeostasis in adults with normal-weight obesity
Background
Normal-weight obesity (NWO) describes individuals with a normal body mass index (BMI), but high body fat percent. NWO are at-risk for cardiometabolic diseases, but little is known about their bone health.
Methods
Adults (N = 24) were classified as NWO (n = 12; 5M/7F) or low body fat percent controls (Con; n = 12; 6M/6F). Body composition and whole-body bone mineral density (BMD) were assessed using DXA. A serum bioplex assay was performed to examine markers related to bone formation and resorption.
Results
In addition to higher body fat percent and visceral fat, NWO had lower whole-body BMD relative to Con (p's < 0.05). Circulating leptin was higher in NWO than Con (p < 0.05). Two biomarkers generally associated with lower bone mass – sclerostin and parathyroid hormone – were higher in NWO compared to Con (p's < 0.05).
Conclusion
In this preliminary study, adults with NWO displayed lower whole-body BMD alongside evidence of bone resorption. Impaired bone health may be another subclinical risk factor present in NWO.
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