Vitamin D May Lower Blood Pressure in Overweight Seniors

TOPLINE:

Supplementation with vitamin D and calcium can reduce systolic and diastolic blood pressure in older individuals with overweight, particularly in those with a body mass index (BMI) > 30 and those diagnosed with hypertension.

METHODOLOGY:

• Large cohort data have provided epidemiologic evidence linking vitamin D deficiency to a higher risk for cardiovascular disorders, including hypertension; however, evidence on the beneficial effects of vitamin D supplementation on blood pressure outcomes remains inconclusive.
• A post hoc analysis of a randomized controlled trial was conducted to investigate the effect of two doses of cholecalciferol (vitamin D3) on blood pressure in individuals aged 65 years or older with a BMI > 25 and serum vitamin D levels of 10-30 ng/mL.
• A total of 221 participants were recruited through outpatient departments, clinics, and advertisements in the greater Beirut area and received calcium supplementation in combination with either a low dose (600 IU/d, as recommended by the Institute of Medicine [IOM]) or a high dose (3750 IU/d) of vitamin D3.
• Blood pressure measurements were taken at baseline, 6 months, and 12 months using a SureSigns VS3 monitor.
• Participants were also stratified by BMI and hypertension status to assess the effects of vitamin D and calcium on blood pressure.

TAKEAWAY:

• Systolic and diastolic blood pressures were significantly reduced with vitamin D supplementation in the overall cohort (mean difference, 3.5 and 2.8 mm Hg, respectively; P = .005 and P = .002, respectively), with the effect more prominent in those in the high-dose vitamin D group.
• Participants with a BMI > 30 experienced reductions in both systolic and diastolic blood pressures in the overall cohort (P P = .01, respectively); although the systolic blood pressure was significantly reduced with both high- and low-dose vitamin D, the diastolic blood pressure decreased in the high-dose group only.
• Patients with hypertension benefited from all doses of vitamin D, regardless of the BMI.
• Systolic blood pressure at 6 and 12 months was significantly predicted by BMI and baseline systolic blood pressure measurements, although not by the dose of vitamin D received.

IN PRACTICE:

“Our study found vitamin D supplementation may decrease blood pressure in specific subgroups such older people, people with obesity, and possibly those with low vitamin D levels,” said study author, Ghada El-Hajj Fuleihan, MD, MPH, of the American University of Beirut Medical Center in Beirut, Lebanon, in a news release. “High vitamin D doses compared to the IOM’s recommended daily dose did not provide additional health benefits.”

SOURCE:

This study was led by Maya Rahme, Department of Internal Medicine, Division of Endocrinology, Calcium Metabolism and Osteoporosis Program, World Health Organization Collaborating Center for Metabolic Bone Disorders, American University of Beirut Medical Center in Beirut, Lebanon. It was published online in Journal of the Endocrine Society.

LIMITATIONS:

This study’s limitations included the exploratory nature of the analyses and the low power of the subgroup analyses. Additionally, the study focused on older individuals who were sedentary and had overweight, many of whom had prediabetes — conditions known to influence blood pressure. The possible effect of calcium alone on blood pressure reduction was also unclear.

DISCLOSURES:

This study was supported by grants from the American University of Beirut, St Joseph University, and the Lebanese Council for National Scientific Research. No relevant conflicts of interest were disclosed by the authors.

This article was created using several editorial tools, including AI, as part of the process. Human editors reviewed this content before publication.