Abstract
Purpose
The aim is to evaluate the effect of β-carotene for osteoporosis and provide quantitative evidence.
Method
PubMed, Embase, Web of Science, and Cochrane Library were searched for eligible studies. Fifteen studies were included. Random-effect model was applied to pool the odds ratio (OR). The risk of osteoporosis and fracture were compared between low β-carotene intake group and high β-carotene intake group.
Result
The intake of β-carotene was unassociated with the overall risk of osteoporosis [OR = 0.733, 95% Cl (0.528, 1.018), p = 0.064]. Subgroup analysis showed that the intake of β-carotene was negatively associated with the risk of osteoporosis in both male subgroup [OR = 0.7, 95% Cl (0.549, 0.893), I2 = 40.40%, p = 0.004] and female subgroup [OR = 0.684, 95% Cl (0.487, 0.960), I2 = 86.40%, p = 0.028]. There was also a negative association between β-carotene intake and osteoporosis in Asia subgroup [OR = 0.512, 95% Cl (0.403, 0.650), I2 = 0.00%, p = 0], whereas no association was observed in Western subgroup [OR = 1.107, 95% Cl (0.908, 1.350), I2 = 2.30%, p = 0.314]. In addition, random-effect model was adopted to pool the standard mean difference (SMD), and the results showed that β-carotene intake was positively associated with overall bone mineral density (BMD) [SMD = − 0.213, 95% Cl (− 0.391, − 0.034), I2 = 87.30%, p = 0.019]. Subgroup analysis showed that β-carotene intake was positively associated with BMD in Asian participants [SMD = − 0.394, 95% Cl (− 0.461, − 0.328), I2 = 0, p = 0], while unassociated in Western participants [SMD = − 0.047, 95% Cl (− 0.314, 0.219), I2 = 78.9%, p = 0.727].
Conclusion
β-carotene may improve BMD and reduce the risk of osteoporosis and fracture. However, these effects could vary by gender and race and need to be further validated by longitudinal studies.
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Data availability
All data generated or analyzed during this study are included in this published article or are available from the corresponding author on reasonable request.
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Gao, S.S., Zhao, Y. The effects of β-carotene on osteoporosis: a systematic review and meta-analysis of observational studies. Osteoporos Int 34, 627–639 (2023). https://doi.org/10.1007/s00198-022-06593-7
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DOI: https://doi.org/10.1007/s00198-022-06593-7