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. 2022 Apr 29;9:837458. doi: 10.3389/fnut.2022.837458

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Copyright © 2022 Hou, Su and Chao.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Flow diagram of the study enrollment process. A total of 906 COVID-19 (coronavirus disease 2019) infected patients comprised the eligible study population as of 2021. In order to study vegetarian diets in connection with COVID-19 severity, 319 patients were excluded due to not being evaluated between May 2021 and August 2021. Hence, a total of 587 patients were examined for eligibility. The questionnaire was not completed in detail by 78 patients during admission, which included eight critical, 23 moderate to severe, and 47 uncomplicated (mild) COVID-19 patients. A total of 509 patients with complete follow-up data were included in this study.