CalciumNEW2026-08

[Associations of serum micronutrients with osteoporotic fracture].

Liu T, Li Z H, Xia H X, Fan M Y et al. — Zhonghua liu xing bing xue za zhi = Zhonghua liuxingbingxue zazhi

Summary

This study investigated the relationship between blood levels of certain nutrients and the risk of bone fractures in people with osteoporosis. It found that individuals with lower blood calcium levels were more likely to have experienced an osteoporotic fracture. Maintaining sufficient calcium might be important for reducing fracture risk in those with weakened bones.

AI-generated summary — read the original

Key points

Lower blood calcium levels were associated with a higher risk of bone fractures in people with osteoporosis.
This link between calcium and fracture risk remained even after considering other health factors.
Other nutrients like phosphorus, iron, and vitamin D did not show a clear association with fracture risk in this study.
Maintaining adequate calcium levels might help reduce the risk of fractures for those with osteoporosis.

What the study looked at

What question did the study ask? Researchers wanted to understand if the levels of certain nutrients in the blood, including calcium, phosphorus, iron, and vitamin D, were connected to the likelihood of experiencing a bone fracture in individuals with osteoporosis. How was it studied? This study looked back at the medical records of nearly 6,000 patients hospitalized for osteoporosis. They compared nutrient levels in patients who had experienced a fracture with those who had not. Statistical methods were used to analyze these relationships, adjusting for other factors like age, sex, and existing health conditions. What did it find? The study found a significant inverse relationship between blood calcium levels and osteoporotic fractures. This means that patients with lower blood calcium were more likely to have experienced a fracture. This association remained strong even after accounting for other variables. Interestingly, the study did not find a clear link between blood levels of phosphorus, iron, or vitamin D and fracture risk. Bone mineral density did not appear to explain the connection between these nutrients and fractures.

Dietary takeaway

This research suggests that maintaining adequate calcium levels in your body might be important for reducing the risk of bone fractures, especially if you have osteoporosis. While this study looked at blood levels, ensuring you get enough calcium through your diet—from sources like dairy products, leafy greens, and fortified foods—is a practical step. Remember, this is one study, and more research is always needed to confirm these findings.

Abstract

To evaluate the relationship between serum micronutrient levels, including calcium, phosphorus, iron, and 25-hydroxyvitamin D, and the incidence of osteoporotic fracture. A retrospective analysis was performed in 5 984 patients hospitalized in the Department of Osteoporosis, West China Fourth Hospital, Sichuan University, from December 2017 to October 2024. The patients with osteoporotic fracture were divided into case group and those without osteoporotic fracture were divided into control group. Missing data were addressed using multiple imputation. Logistic regression model was used to analyze the association between different micronutrient levels and fracture risk, and mediating effect of bone mineral density was further evaluated. Model discrimination was evaluated using receiver operating characteristic curve and area under the curve (AUC), and differences in AUC were compared by DeLong test. The calcium, phosphorus, and iron levels were significantly lower in patients with osteoporotic fracture than in controls, the difference was significant (all <0.05). After adjustment for age, sex, BMI, and comorbidity, including diabetes, coronary heart disease, and hypertension, the logistic regression analysis showed that calcium level was significantly inversely associated with osteoporotic fractures, and phosphorus, iron, and 25-hydroxyvitamin D were not significantly associated with osteoporotic fractures. After additional mutual adjustment for phosphorus, iron and 25-hydroxyvitamin D, the association between calcium and fracture remained stable (=0.88, 95%: 0.82-0.94, <0.001). This relationship was consistent in different subgroups, with no significant interactions. Bone mineral density had no effect to mediate the association between micronutrients and fracture. Using calcium level in the baseline model significantly increased the AUC, enhancing its discriminative ability (=0.002). In patients with osteoporosis, the serum calcium levels showed an inverse association with fracture risk, and maintaining adequate calcium may help reduce this risk. The etiological roles of other serum micronutrients, including phosphorus, iron, and 25-hydroxyvitamin D, remain to be further analyzed.

View on PubMed →DOI: 10.3760/cma.j.cn112338-20251124-00847