Kale
Along with some citrus fruits such as oranges, leafy and dark greens like kale can be a great option to boost the immune function and increase your intake of vitamin A. Recent researches show that regular consumption would lead to a higher number of white blood cells in the bloodstream. This will help your body fight against foreign invaders such as bacteria, viruses, or other pathogens. You can toss kale into pasta dishes, stir-fries, omelets, and salads a couple of times per week. [2]
