Ketogenic diet could also prove to be a valuable measure in the threatening situation of the current COVID‐19 pandemic, as dysregulation and exhaustion of both CD4+ and CD8+ T cells as well as impairment of classical CD8+ T effector memory cells have been reported as central elements of COVID‐19 immunopathology (Chen & John Wherry, 2020; Habel et al, 2020). Here, CD4 is linked to COVID-19.