A study conducted by Northwestern University revealed that people who drink one or more cups of coffee a day are less likely to develop the COVID-19 infection— about a 10% decrease as opposed to people who do not consume coffee at all.
The result took into account the survey result of 40,000 British adults in the UK Biobank. The study analysed eating habits, including coffee consumption, oily foods consumption, fish, vegetables, red meat, processed meat, etc. in regards to Covid, and came to this conclusion.
"Coffee consumption favourably correlates with inflammatory biomarkers such as CRP, interleukin-6 (IL-6), and tumour necrosis factor I (TNF-I), which are also associated with Covid-19 severity and mortality," the study read. The study also concluded that coffee consumption lowered the risk of pneumonia amongst the elderly, and that this could be related to the immunoprotective effect of coffee against Covid-19.
The study has also shown that lower consumption of processed foods leads to a lesser chance of contracting Covid, and that a consumption of at least 0.67 servings of vegetables can help to reduce the risk of infection. This includes all vegetables except potatoes.
"Our results support the hypothesis that nutritional factors may influence distinct aspects of the immune system, hence susceptibility to COVID-19. Encouraging adherence to certain nutritional behaviours (eg, increasing vegetable intake and reducing processed meat intake) may be an additional tool to existing COVID-19 protection guidelines to limit the spread of this virus,” the research stated. “Although these findings warrant independent confirmation, adherence to certain dietary behaviours may be an additional tool to existing COVID-19 protection guidelines to limit the spread of this virus.”