High prevalence of vitamin D deficiency (VDD) justifies a cost-effective and sustainable strategy to combat VDD in the community. This study was undertaken for the first time to evaluate the efficacy of daily consumption of vitamin D fortified sunflower oil with a meal.
This single-blind trial was conducted in two separate institutions: one as intervention (D-fortified sunflower oil) group (DO, n1 = 39) and the other as control (unfortified sunflower oil) group (SO, n2 = 33). Participants consumed their lunches cooked either with D-fortified or unfortified cooking sunflower oil (500 IU/30 g) for 12 weeks. Dietary, anthropometric and biochemical assessments were done for all participants before and after the intervention.
A total of 65 subjects from both sexes aged 32.5 ± 4 years completed the intervention period. Serum 25(OH)D showed a significant increase in DO and a decrease in SO group (8.8 ± 9.3 vs. − 7.4 ± 6.4 ng/mL, p < 0.001). The rise in serum 25(OH)D in DO group was accompanied by a significant decrease in iPTH (DO: − 10.2 ± 29.4 vs. SO: + 9.2 ± 29.5 pg/mL; p = 0.009). A significant reduction in weight (p = 0.004), BMI (p = 0.029), waist girth (p < 0.001), serum total cholesterol (p = 0.0290) and LDL-C (p = 0.010) was observed in DO, as compared with SO group.
Cooking oil can be considered as an efficacious vehicle for mass fortification program to combat VDD. The improvement of vitamin D status may bring about betterment of certain cardiometabolic risk factors.
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Present study was supported by Shahid Beheshti University of Medical Sciences. Both D-fortified and regular sunflower oils were produced and donated by Kourosh Industry with the special assistance and support of the managing director, Mr. Kourosh Montasar. We thank all the participants who sincerely helped us to conduct this project. All laboratory bench works were performed at the Laboratory of Nutrition Research, NNFTRI. We also appreciate Mrs. Marjan Rismanchi for her assistance in laboratory tests.
Conflict of interest
On behalf of all authors, the corresponding author states that there is no conflict of interest.
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Nikooyeh, B., Zargaraan, A., Kalayi, A. et al. Vitamin D-fortified cooking oil is an effective way to improve vitamin D status: an institutional efficacy trial. Eur J Nutr 59, 2547–2555 (2020). https://doi.org/10.1007/s00394-019-02103-4
- Vitamin D
- Sunflower oil
- Efficacy trial