Kefir
Kefir is a fermented food that contains a lot of probiotics, which are live bacteria that can help with your immune system and gut health. A specific probiotic type in this food called Lactobacillus reuteri is proved to stimulate the production of white blood cells. Thus, frequent consumption of kefir would aid in fighting common infections, both viral and bacterial. However, keep in mind that not all types of kefir have this strain. Make sure to do your research before adding to daily meals. Try including kefir at least several times on a weekly basis. [3]
