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Maria Gomez

Maria Gomez

Professor

Maria Gomez

Modest effects of dietary supplements during the COVID-19 pandemic : Insights from 445 850 users of the COVID-19 Symptom Study app

Author

  • Panayiotis Louca
  • Benjamin Murray
  • Kerstin Klaser
  • Mark S. Graham
  • Mohsen Mazidi
  • Emily R. Leeming
  • Ellen Thompson
  • Ruth Bowyer
  • David A. Drew
  • Long H. Nguyen
  • Jordi Merino
  • Maria Gomez
  • Olatz Mompeo
  • Ricardo Costeira
  • Carole H. Sudre
  • Rachel Gibson
  • Claire J. Steves
  • Jonathan Wolf
  • Paul W. Franks
  • Sebastien Ourselin
  • Andrew T. Chan
  • Sarah E. Berry
  • Ana M. Valdes
  • Philip C. Calder
  • Tim D. Spector
  • Cristina Menni

Summary, in English

Objectives Dietary supplements may ameliorate SARS-CoV-2 infection, although scientific evidence to support such a role is lacking. We investigated whether users of the COVID-19 Symptom Study app who regularly took dietary supplements were less likely to test positive for SARS-CoV-2 infection. Design App-based community survey. Setting 445 850 subscribers of an app that was launched to enable self-reported information related to SARS-CoV-2 infection for use in the general population in the UK (n=372 720), the USA (n=45 757) and Sweden (n=27 373). Main exposure Self-reported regular dietary supplement usage (constant use during previous 3 months) in the first waves of the pandemic up to 31 July 2020. Main outcome measures SARS-CoV-2 infection confirmed by viral RNA reverse transcriptase PCR test or serology test before 31 July 2020. Results In 372 720 UK participants (175 652 supplement users and 197 068 non-users), those taking probiotics, omega-3 fatty acids, multivitamins or vitamin D had a lower risk of SARS-CoV-2 infection by 14% (95% CI (8% to 19%)), 12% (95% CI (8% to 16%)), 13% (95% CI (10% to 16%)) and 9% (95% CI (6% to 12%)), respectively, after adjusting for potential confounders. No effect was observed for those taking vitamin C, zinc or garlic supplements. On stratification by sex, age and body mass index (BMI), the protective associations in individuals taking probiotics, omega-3 fatty acids, multivitamins and vitamin D were observed in females across all ages and BMI groups, but were not seen in men. The same overall pattern of association was observed in both the US and Swedish cohorts. Conclusion In women, we observed a modest but significant association between use of probiotics, omega-3 fatty acid, multivitamin or vitamin D supplements and lower risk of testing positive for SARS-CoV-2. We found no clear benefits for men nor any effect of vitamin C, garlic or zinc. Randomised controlled trials are required to confirm these observational findings before any therapeutic recommendations can be made.

Department/s

  • Diabetic Complications
  • EXODIAB: Excellence of Diabetes Research in Sweden
  • Genetic and Molecular Epidemiology
  • EpiHealth: Epidemiology for Health

Publishing year

2021-06-01

Language

English

Pages

149-157

Publication/Series

BMJ Nutrition, Prevention and Health

Volume

4

Issue

1

Document type

Journal article

Publisher

BMJ Publishing Group

Topic

  • Nutrition and Dietetics

Keywords

  • COVID-19
  • nutritional treatment

Status

Published

Research group

  • Diabetic Complications
  • Genetic and Molecular Epidemiology

ISBN/ISSN/Other

  • ISSN: 2516-5542