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7X less risk of influenza if Vitamin D levels higher than 30 ng – Oct 2017

Association of serum 25-hydroxyvitamin D with influenza in case-control study nested in a cohort of Japanese employees.

Clin Nutr. 2017 Oct;36(5):1288-1293. doi: 10.1016/j.clnu.2016.08.016. Epub 2016 Aug 26.
Nanri A1, Nakamoto K2, Sakamoto N3, Imai T4, Akter S5, Nonaka D6, Mizoue T5.

 Download the PDF from Sci-Hub via VitaminDWiki

  • Note: It appears more than 7X risk reduction if >40 ng, but the study does not say how much
    Getting a loading dose of Vitamin D easily boosts Vitamin D levels >40ng for a few days

Several intervention studies have examined the effect of vitamin D supplementation on influenza or influenza-like illness, but their results have been inconsistent. We prospectively examined the association of serum 25-hydroxyvitamin D with influenza among Japanese workers.

We conducted a nested case-control study in a cohort of workers in 4 companies in the Kanto and Tokai areas of Japan. Physician-diagnosed influenza that occurred during the winter season was ascertained using a self-administered questionnaire. Two controls matched by company, sex, and age (and checkup date in 1 company) were selected for each case. Serum 25-hydroxyvitamin D concentrations at baseline were measured using a competitive protein binding assay. Odds ratio of influenza were estimated by conditional logistic regression with adjustment for covariates.

Of 182 cases and 364 controls, 179 cases and 353 controls with complete data were included in the analysis. Serum 25-hydroxyvitamin D concentrations were not associated with a significantly lower risk of influenza; the multivariable-adjusted odds ratio for the highest (≥30 ng/mL) versus lowest category (<20 ng/mL) was 0.77 (95% confidence interval 0.37-1.59) (P for trend = 0.80). In a subgroup of participants without vaccination, vitamin D sufficiency (≥30 ng/mL) was associated with a significantly lower risk of influenza (odds ratio 0.14; 95% confidence interval 0.03-0.74).

Overall, circulating 25-hydroxyvitamin D concentrations were not appreciably associated with influenza episodes. However, the lower influenza risk associated with vitamin D sufficiency among unvaccinated participants warrants further investigation.

23 citations of this study as of Feb 2021

  • Vitamin D and Influenza—Prevention or Therapy? - Aug 2018, https://doi.org/10.3390/ijms19082419, FREE PDF
  • Acute Respiratory Tract Infection and 25-Hydroxyvitamin D Concentration: A Systematic Review and Meta-Analysis
    • Aug 2019 PDF 2.5X more likely to be severe if low vitamin D
    • Image
      • Perhaps >4X if >40ng (Off the chart to the left)

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7X less risk of influenza if Vitamin D levels higher than 30 ng – Oct 2017        
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Attached files

ID Name Comment Uploaded Size Downloads
15053 ARTI Meta.pdf admin 17 Feb, 2021 3.04 Mb 313
15052 ARTI Meta.jpg admin 17 Feb, 2021 49.96 Kb 554
13537 without vaccination.jpg admin 25 Feb, 2020 34.76 Kb 1982
13536 Influenza case-controlled.pdf admin 25 Feb, 2020 638.96 Kb 769