If you’re chugging orange juice or sipping chicken soup to battle colds, you might’ve been sold a bill of goods. Daniel M. Davis is head of life sciences and professor of immunology at Imperial College London. He joins host Krys Boyd to discuss the facts vs. myths of keeping your immune system healthy, why too strong an immune system might be detrimental, and the surprising remedies that actually work. His book is “Self-Defense: A Myth-Busting Guide to Immune Health.”