Can the immune system be prompted to perform better with purposeful nutritional intervention?
While there is little argument that deficiency in both macronutrients and micronutrients can cause impairment of immune function, growing evidence suggests that for certain nutrients increased intake above and beyond recommended levels may help in optimizing immune functions.
Potential intervention agents include polyunsaturated fatty acids, zinc, vitamins D and E, select probiotic strains, compounds found in the tea plant, other phytochemicals, and more.
This study from 2018, published in Frontiers in Immunology provides a good overview on modulation of immune function by selected mainline nutrients.