Challenges arise during the COVID-19 crisis how to optimally support the immune system in the general population, especially under self-confinement. It is known that an optimal immune response depends on an adequate diet and nutrition status in order to keep infection at bay. Several nutrients, including proteins, vitamins A, D and C, zinc, antioxidants such as polyphenols and carotenoids and finally dietary fiber have been emphasized to aid in reducing inflammation and oxidative stress, in turn benefitting the immune system. In this review, we highlight the importance of an optimal status of relevant nutrients to effectively strengthening the immune system during the COVID-19 crisis.
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