Vitamin D status and obesity markers in older adults: results from West China Health and Aging Trends study

Abstract

Backgrounds Vitamin D deficiency and insufficiency in older adults seems to be common, but the prevalence estimates are lacking in West China. Previous studies suggested that low vitamin D status was associated with obesity. However, most of them evaluated obesity based on body mass index (BMI) and there are no studies at present exploring the association between vitamin D status and different obesity markers. The present study aims to investigate the prevalence of low vitamin D status and evaluate the association between the vitamin D status and different obesity markers among older adults in West China. Methods Data was based on the baseline of West China Health and Aging Trends study (WCHAT). All of the participants were older than 60 years old in the present study. Vitamin D status was based on laboratory data, and obesity markers were assessed by bioelectrical impedance analysis (BIA) using the InBody 770 analyzer. Multiple linear regression was performed to find the association between the vitamin D status and various obesity markers. Results The study included 2661 individuals (mean age: 67.7 ± 6.0 years; males: 41 %). The mean vitamin D level was 18.8 ± 6.3 ng/ml (range: 5 to 59 ng/ml); 5.2 % of participants had a sufficient level of vitamin D, 31.8 % had vitamin D insufficiency, and 63.0 % had vitamin D deficiency. Our results showed that vitamin D status was negatively associated with fat mass index (FMI), visceral fat area (VFA), and waist-hip ratio (WHR) in both sexes. Comparing to other obesity markers, WHR had the strongest correlation with vitamin D status in both sexes (β = -6.090, P = 0.046 in males; β = -11.253, P < 0.001 in females). No significant association was found between vitamin D status and BMI in males. Conclusion The prevalence of vitamin D insufficiency and deficiency among older adults in West China was high. Among the older adults in west China, WHR showed stronger association with vitamin D status and was better for the prediction of vitamin D insufficiency or deficiency in both sexes, compared to BMI. Trial registration Chinese Clinical Trial Registry: ChiCTR1800018895.

Effect of Vitamin D3 on Changes in Muscle Mass in the Elderly in Nursing Homes: Double-Blind Controlled Randomized Trial

“…(Pinkas et al, 2017) In the elderly population in general, similar findings were also put forward by Araghi et al, Zhao et al, and Vitezova et al in studies in the elderly population, where vitamin D status was inversely related to fat mass. (Oliai Araghi et al, 2015;Vitezova et al, 2017;Zhao et al, 2021) Although vitamin D status was found to be associated with fat mass, findings related to the effect of vitamin D3 supplementation on fat mass varied. The study by Chou et al found no significant impact between vitamin D3 supplementation and body composition in the elderly population.…”

The Synaptic and Circuit Functions of Vitamin D in Neurodevelopment Disorders

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