Vitamin D Status of a Low-Income Elderly Community in South Africa
Abstract Objectives Previous studies in the same elderly community found poverty, food insecurity and a double burden of malnutrition (iron, zinc and vitamin A deficiencies and chronic non-communicable diseases), however, a paucity of data exists about vitamin D insufficiency/deficiency for South African elderly. The present study aimed to evaluate the prevalence of vitamin D insufficiency/deficiency among the elderly and its relationship to food insecurity, dietary diversity and common symptoms associated with vitamin D deficiency (VDD). Methods This was a quantitative, cross-sectional study in a convenience sample of 79 independently living elderly voluntarily attending an elderly care center in Sharpeville, South Africa. Measurements included socio-demographic (age, gender) and health (symptoms of VDD), physical activity-, dietary diversity- and food insecurity (validated household food insecurity access score) data, as well as 25-hydroxyvitamin D (25[OH]D3) levels ascertained by electrohemiluminescence immunoassay. The respondents were divided into VDD (<25 nmol/L), vitamin D insufficiency (VDI) (≥25 < 50 nmol/L) and vitamin D adequate (VDA) (≥50 nmol/L) groups. IBM SPSS Software, version 26.0 was used for descriptive and inferential statistical analyses. Results VDD and VDI was observed in 3.8% and 32.9% of elderly respectively. Of the total sample, 11.4% were moderately and 21.5% severely food insecure. The mean(±SD) dietary diversity score was 5.88(±3.95). Only 3.8% of the elderly were not physically active. Significant differences were observed between the VDA, VDI and VDD groups for gender (P = 0.004), age (P = 0.011), back/joint pain (P = 0.035), and the dairy food group diversity score (P = 0.008). No other significant differences were observed. Conclusions Vitamin D insufficiency/deficiency is a problem in these elderly community and associated with back/joint pain that may result in impaired functionality/mobility that can exacerbate food access and food insecurity. This study further supports the importance of dairy consumption to prevent VDI and VDD. Funding Sources National Research Foundation (South Africa).