Professor Daniel M. Davis is a leading immunologist at Imperial College London, and he's here to set the record straight on what actually keeps us well through winter.

He reveals the truth about vitamin C (spoiler: you might want to rethink that morning glass of orange juice), why the phrase "boost your immune system" makes him wince, and the one lifestyle factor that's genuinely proven to affect your immune response.

He also chats to Liz about what really happens when you train for a marathon, the science behind allergies and autoimmune disease, and whether those probiotic yogurts are doing anything at all.

Links mentioned in the episode:

Self-Defense: A Myth-Busting Guide to Immune Health by Professor Daniel M. Davis
Follow Professor Daniel M. Davis on Instagram
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Orange juice won't cure your cold (but this might) – with Professor Daniel M. Davis