Diet Quality and Risk of SARS-CoV-2 Infection or COVID-19: A Systematic Review of Observational Studies.

"Conflict of interest LI reports financial support was provided by a grant of the Umberto Veronesi Foundation (Bando Covid-19, linea 1, Research project ‘Burden of SARS-CoV-2 infection in populations with high or low risk of infection’). All other authors report no conflicts of interest."

"Funding The present analyses were partially supported by the Italian Ministry of Health (Ricerca Corrente 2022-2024) and the Fondazione Umberto Veronesi (Bando Covid-19, linea 1, Research project ‘Burden of SARS-CoV-2 infection in populations with high or low risk of infection’). SS was supported by the Joint Platform Umberto Veronesi Foundation-Department of Epidemiology and Prevention at IRCCS Neuromed in Pozzilli, Italy. The funders had no role in study design, collection, analysis, and interpretation of data, nor in the writing of the manuscript or in the decision to submit the article for publication. All authors were and are independent from funders."

"This systematic review was performed according to the PRISMA guidelines [] (see the PRISMA checklist in ) and was registered at PROSPERO (reference CRD42023397371). This study was registered at PROSPERO as CRD42023397371."