Patients with T1DM are more at risk of developing osteoporosis than healthy individuals, and vitamin D supplementation alone may not be sufficient to affect BMD, suggesting patients with type 1 diabetes should receive higher doses of vitamin D than healthy adults and control their calcium, magnesium and phosphates serum concentrations.
Key Findings
Results
Significant differences in BMD, Z-score, and T-score were observed between patients with T1DM and healthy controls at both the femoral neck and lumbar spine.
The study included 66 adults with T1DM and a control group of 66 healthy adults matched for age and weight.
Densitometric measurements were performed at the lumbar spine (L1-L4) and femoral neck (FN) using dual-energy X-ray absorptiometry (DXA).
Significant differences were observed in BMD, Z-score, and T-score for both FN and L1-L4 between diabetic and non-diabetic subjects.
Patients with T1DM were found to be at greater risk of developing osteoporosis than healthy individuals.
Results
A substantial proportion of T1DM patients failed to achieve optimal vitamin D concentrations regardless of osteopenia status.
Only 50% of participants with diabetes and osteopenia showed optimal vitamin D concentration.
Only 40% of diabetic patients without osteopenia showed optimal vitamin D concentration.
All patients completed a questionnaire regarding vitamin D supplementation and symptoms associated with osteoporosis.
Results
Vitamin D supplementation did not produce significant differences in BMD, T-score, or Z-score at the femoral neck or lumbar spine in T1DM patients.
There were no differences in BMD, T-score, and Z-score of FN between subjects who supplemented and those who did not supplement vitamin D.
Similarly, no differences were found in L1-L4 BMD measures between supplemented and non-supplemented groups.
These findings suggest that vitamin D may not be the only factor affecting BMD in T1DM patients.
Methods
The study assessed serum concentrations of vitamin D, calcium, phosphates, and magnesium as significant factors in bone metabolism in T1DM patients.
Blood concentrations of vitamin D, calcium, phosphates, and magnesium were measured in both T1DM patients and healthy controls.
The study evaluated the impact of vitamin D supplementation on both vitamin D serum levels and BMD in T1DM patients.
The authors concluded that patients with T1DM should control their calcium, magnesium, and phosphates serum concentrations in addition to vitamin D.
Conclusions
The authors recommend that patients with type 1 diabetes should receive higher doses of vitamin D than healthy adults.
Standard vitamin D supplementation was insufficient to achieve optimal vitamin D concentrations in a large proportion of T1DM patients.
The recommendation was based on findings that vitamin D supplementation alone did not significantly affect BMD outcomes in T1DM patients.
Patients with T1DM were also recommended to be screened for osteoporosis and other complications.
Zawada A, Michalak M, Naskręt D, Grzelka-Woźniak A, Ratajczak-Pawłowska A, Rychter A, et al.. (2026). Vitamin D, calcium, phosphates, and magnesium serum level and bone mineral density in patients with type 1 diabetes.. Acta biochimica Polonica. https://doi.org/10.3389/abp.2026.15388