Dr. Jenna Macciochi is a British immunologist, a certified fitness instructor, and a researcher who focuses on how nutrition and lifestyle affect immunity. At a time when many of us are chomping vitamin C gummies and practically nailing garlic above our doors, her new book, Immunity, is a must-read. What is the most common misconception you encounter when it comes to immunity? Jenna: That you can boost your immunity through diet and supplements. Many people think the immune system is an on/off switch with an ability to be given an extra boost, such as through supplements, when needed. The problem is that the immune system is not binary; it’s a whole spectrum of cells, molecules, and organs scattered throughout every part of your body. Some parts fight off infections, while others are the peacekeepers that maintain the status quo. When something allegedly boosts the immune system, we need to ask which part. And often it’s the case that an overshooting of the immune system leads to damage to our own organs and tissues. Good nutrition and lifestyle is, of course, important, but there will always be a ba …