Genetic Variability in Taste Receptors and Its Influence on COVID-19 Symptom Severity

The COVID-19 pandemic has impacted global health, economy, and society, highlighting the need for a deeper understanding of viral mechanisms and immunity enhancement strategies. This study investigates the relationship between genetic variability in taste receptors, particularly TAS2R38, and COVID-19 susceptibility, as well as the role of nutrition in modulating immune function. Influenced by genetic diversity, taste perception plays a role in food preferences, which may affect immune responses. We collected data from 21 participants regarding their food preferences, COVID-19 history, and phenotypic classification of taste perception using phenylthiocarbamide (PTC) strips. Our findings indicate a non-significant negative correlation between body mass index (BMI) and COVID-19 symptom severity, with supertasters experiencing milder symptoms compared to tasters and non-tasters. Additionally, participants with a history of COVID-19 preferred sweeter foods, while those without a history favoured bitter-tasting foods. These results suggest that genetic variations in taste receptors and dietary choices may influence individual immune responses to viral infections. Although this study faced limitations due to sample size and genotyping challenges, it emphasises the potential role of personalised nutrition and genetic factors in enhancing immunity against COVID-19 and future health crises. Further research is recommended to explore genotypic variations and their interactions with dietary patterns in shaping immune responses.