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Erschienen in:
29.05.2019 | Original Article
Dietary inflammatory index® and cortical bone outcomes in healthy adolescent children
Erschienen in: Osteoporosis International | Ausgabe 8/2019
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Summary
Diet is thought to modulate inflammation. This study shows no relationships between the dietary inflammatory index (DII) and biomarkers of inflammation or bone after adjusting for covariates. Monocyte chemoattractant protein-1 was inversely associated with peripheral tibia cortical thickness and prospective childhood studies should be conducted to better understand this relationship and to determine if there are long-term consequences in adulthood.
Introduction
Examine the relationships between the DII-scores and bone and biomarkers of inflammation in 290 adolescents, ages 9–13 years.
Methods
DII-scores were calculated from 3-day diet records and categorized into tertiles, low (< − 1.34), medium (− 1.34 to 1.41), and high (> 1.41) inflammation. Radius and tibia bone were assessed via peripheral quantitative computed tomography (Stratec XCT 2000) at the 66% site relative to the distal growth plate. Fasting serum was measured for tumor necrosis factor alpha (TNF-α), interleukin-6 (IL-6), vascular endothelial growth factor (VEGF), and monocyte chemoattractant protein-1 (MCP-1). The relationships between DII-scores and bone and biomarkers of inflammation were assessed using bivariate and partial correlations adjusting for sexual maturation, sex, race, muscle cross-sectional area, and height. ANOVA/ANCOVA models were used to compare DII-tertiles with dependent variables.
Results
DII-scores were negatively associated with tibia trabecular area (TtAr; r = − .141, P = .019), periosteal perimeter (PsPM; r = − .145, P = .016), endosteal perimeter (r = − .145, P = .016), strength strain index (SSI; r = − .129, P = .032), and radius TtAr (r = − .140, P = .020), PsPM (r = −.138, P = .027) and SSI (r = −.131, P = .036) but nullified when adjusting for covariates. Tibia PsPM was higher in the low DII group compared to the medium (P = .050) and high (P = .046) groups but nullified after controlling for covariates. DII-scores were not associated with TNF-α, VEGF, or IL-6, but were associated with MCP-1 only in the unadjusted model (r = .125, P = .042). In the adjusted model, MCP-1 was inversely associated with tibia cortical thickness (r = −.150 P = .030).
Conclusion
The DII-scores were not related to biomarkers of inflammation or bone; however, the biomarker of inflammation, MCP-1 was negatively associated with tibia CtTh. Future prospective pediatric studies should be conducted to better understand this relationship and determine if there are long-term implications in adulthood.