our essential handbook to staying well in the modern world The immune system is your constant guardian, fighting around the clock to protect you from disease. There's a lot you can do to strengthen this first line of defense against all kinds of threats, from COVID-19 to cancer. Now, immunologist Dr. Jenna Macciochi gives us a crash course on how the immune system actually worksand how to keep yours in shapewith authoritative guidance on: the best foods to eat to strengthen your immune system the importance of movement, and how often to exercise the essential link between immunity and sleep its surprising connection to your mental health.

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