We read the articles by Casas-Rojo1 and Suarez2 with interest. It is curious that multiple risk profiles for infection, hospital or intensive care unit admission, and death from COVID-19 have been published since the beginning of the pandemic. In all of them, age, hypertension, male sex, diabetes mellitus, and obesity have been included as risk factors. On the other hand, the recommended therapeutic strategies have changed. Notably, nutritional status is not included in these risk profiles. We strongly agree that several nonmedical factors and conditions can influence health.3 It is a no-brainer to say that nutritional status is considered both a health status indicator and an element of resistance against intercurrent diseases.

Evidence has been reported on the influence that diet has on the immune system and susceptibility to disease. It has been shown that a deficit in specific nutrients affects the immune system through cell activation, changes in the production of signaling molecules, and gene expression. Nutritional deficiencies in energy, protein, and micronutrients have been associated with depressed immune function and increased susceptibility to infection.4 In addition, dietary components are significant determinants of gut microbiota composition and, consequently, can shape the characteristics of immune responses in the body. Nutritional support therapies form part of the care for patients with a high degree of comorbidity and advanced age, factors related to a higher probability of presenting with poor progress (Fig. 1).

Figure 1.

The interrelationship between nutritional status, health, and COVID-19 progress.

Several mechanisms have been implicated in COVID-19 progress. Host-related factors include sex, age, and lung and metabolic diseases. A more unknown aspect is the interrelationship between nutritional status and health at not only the individual, but also the community and global levels. Several factors contribute to nutritional status, including economic stability; medical comorbidities; racism or other discrimination; and food insecurity, as determined by unequal access to essential nutrients or healthy food. All condition community and individual health status such that, through impaired innate and acquired immunity or unhealthy gut microbiota, they predispose individuals to infectious diseases as well as more aggressive and severe COVID-19 disease.

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Just a few small studies have reported on the nutritional status of patients with COVID-19, and, in those works, it was clear that patients with nutritional deficiencies had poor progress.5 We have not found any recommendations regarding treatment and prevention strategies in this regard, only opinion articles. If the nutritional status is a decisive factor in the progress of patients with infectious diseases, it leads us to ask ourselves, Is nutrition the forgotten risk factor in COVID-19 infection?