A recent study investigated the connection between the consumption of phytochemicals, gut microbiota, and the risk of contracting COVID-19 among healthy individuals aged 25-45 without any underlying health conditions. The results revealed that a higher intake of certain plant-based compounds, such as polyphenols, lignans (secoisolariciresinol and matairesinol), and phytosterols (including stigmasterols and β-sitosterols), was associated with a lower risk of COVID-19.
The significance of this study lies in the recognition that enhancing resilience to infections, even among younger and healthier individuals, is essential, as emphasized by the ongoing pandemic. Previous research has highlighted the role of good nutritional status in fortifying the immune system against pathogens like SARS-CoV-2. Specifically, antioxidants and anti-inflammatory agents found in polyphenols and phytosterols have demonstrated immune-boosting and antiviral properties.
Furthermore, studies have shown that dietary polyphenols can impact immune cells, such as dendritic cells, B cells, and T cells, while also influencing macrophage behavior, thereby modulating the immune response. Phytosterols, on the other hand, have therapeutic potential against oxidative stress, gut dysbiosis, and inflammation.
Plant-based diets rich in phytochemicals have further been acknowledged for their ability to regulate lipid metabolism, which helps counteract virus entry and propagation within cells.
Despite existing research on the relationship between nutrition and COVID-19, little is known about how specific compounds like lignans and phytosterols interact with the immune system and viral infections. This study aims to address this research gap by examining the association between the dietary intake of polyphenols and plant sterols, the abundance of immunomodulatory gut microbiota (Enterococcus spp. and Escherichia coli), and the risk of contracting COVID-19 in physically active, non-obese individuals without comorbidities.
To conduct the study, 95 participants (73 men and 22 women) between the ages of 25 and 45 were observed between July and November 2020. Each participant was asked to maintain their regular daily routine throughout the study, including eating habits and physical exercise patterns. Participants monitored their physical activity, energy expenditure, sleep duration, and maintained dietary records during a 1-week follow-up. Stool samples were collected for gut microbiome testing, and various anthropometry and body composition measurements were recorded. In addition, participants completed a socio-demographic questionnaire.
Dietary intake of polyphenols, lignans, and plant sterols was determined based on the amount of food consumed, analyzed in the laboratory, and cross-referenced with available databases.
Based on the study’s findings, every increase in the tertile of intake category for all investigated polyphenols and phytosterols (except campesterol) was associated with a decrease in COVID-19 contraction risk. The risk reduction ranged from several dozen percent to 70%, depending on the specific plant-based compound. After accounting for basic covariates, statistically significant risk reduction was observed for secoisolariciresinol (OR = 0.28, 95% CI: 0.11–0.61), total phytosterols (OR = 0.47, 95% CI: 0.22–0.95), and stigmasterols (OR = 0.34, 95% CI: 0.14–0.72).
Furthermore, an inverse association was found between increased β-sitosterol intake, total phytosterols, and the occurrence of Escherichia coli in stool samples outside reference values. The highest tertile of phytochemical consumption exhibited reduced odds (72% and 66%, respectively) of abnormal bacteria levels compared to the lowest tertile.
In conclusion, the study supports the hypothesis that a diet rich in polyphenols and phytosterols, including lignans, can reduce the risk of COVID-19 contraction. It is postulated that certain representatives of these compounds, such as β-sitosterol and lariciresinol, may positively impact the presence of commensal bacteria species, like Escherichia coli and Enterococcus spp., which support the immune system.
These findings highlight the need for further research to explore the effects of different phytochemicals on gut microbiome and viral diseases. Understanding the bioavailability of specific phytosterols and lignans is crucial in unraveling the potential of these compounds in combating COVID-19.
For more information, read the full study published in Frontiers in Nutrition: [insert hyperlink].
Authors: Agnieszka Micek, Izabela Bolesławska, Paweł Jagielski, Kamil Konopka, Anna Waśkiewicz, Anna Maria Witkowska, Juliusz Przysławski, Justyna Godos.
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