In a nutshell, whether you're physically stressed, sick, or sleep deprived, your immune system becomes hyperactive, and starts producing white blood cells — your body's first line of defense against foreign invaders like infectious agents. (articles.mercola.com)
Dr. Sarah Cimperman, ND @DrCimperman Skin is the body's largest organ and it's our first line of defense against foreign invaders like microbes and environmental toxins. (thenatpath.com)
«In order to protect itself, the body needs to defend against foreign invaders. (health.com)