In summary, nutrition can play an important role in the body's immune processes. Thus, there is certainly no single component of nutrition that has an all-encompassing effect.
However, one nutrient may be missing from the diet and our immune processes may be stuck. In the prevention of diseases associated with infectious damage to our body, it is even more important that our diet is sufficiently varied, but quantitatively proportional, to make the best use of all our metabolic capabilities within our immunity (especially defense against infection).