As explain in Jessica Booth's article:
Staying healthy isn't just about regular doctor visits and taking your daily dose of vitamin C. To keep your immune system strong and prevent illness, you need to focus on what you're eating, how you're spending most of your time, and even how you're feeling throughout the day. Few people know more about how to boost your immune system than nurses - it's literally their job to keep people healthy. A few nurses have shared their secrets on how to keep your health in tip-top shape, whether we're in the midst of a global pandemic or not.
Link to full article: Redbook Mag