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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 works—and how to keep yours in shape—with authoritative guidance on: the best foods to eat to strengthen your immune systemthe importance of movement, and how often to exercisethe essential link between immunity and sleepits surprising connection to your mental health.