Immune Boosting Foods The immune system consists of organs, cells, tissues, and proteins. Together, these carry out a complex group of defense responses and bodily processes that fight off pathogens, which are the viruses, bacteria, and foreign bodies that cause infection or disease. Having a strong immune system is critical for preventing and fighting disease, especially with the ongoing COVID-19 pandemic still spreading across the world. But there are everyday factors like stress, smoking, lack of sleep, and spending too...