3: The Smartest Doctor in the Room with Dean Mitchell, MD and Prof. Hart

3: The Smartest Doctor in the Room with Dean Mitchell, MD and Prof. Hart

In this eye-opening episode, you'll learn about a different kind of "medicine" that doesn’t come in a pill bottle: carefully controlled UV light. Dr Dean Mitchell chats with Professor Pru Hart, a photoimmunology specialist from Australia’s Kids Research Institute, about narrowband UVB therapy and its surprising effects on autoimmune and inflammatory diseases such as psoriasis and early multiple sclerosis. You’ll hear how dermatologists have used UVB for years on skin conditions and then realised the benefits weren’t just skin deep.

As Hart explains, the skin acts like “a conductor of the orchestra… for whole body homeostasis”, sending signals through the immune and neuroendocrine systems that can influence inflammation throughout the body. The conversation covers Hart’s small but promising trial using whole-body narrowband UVB in people with clinically isolated syndrome, an early precursor of MS. Over 12 months, fewer people in the UVB group progressed to full MS, and blood tests showed reduced inflammatory markers months after treatment.

While the numbers are too small for firm conclusions, the immune changes have sparked plans for larger trials. They also tackle the vitamin D hype. Hart calls it mostly “a biomarker of being in the sun”, suggesting supplementation is useful for deficiency but unlikely to be the magic immune fix many hoped for. Instead, she argues that multiple molecules and pathways triggered by sunlight may be doing the heavy lifting.

For anyone dealing with chronic illness, low mood or just a very indoor lifestyle, the discussion around safe sun exposure, home UVB units and the mental lift people report from light therapy might prompt some reflection. Hart sums up the trade-off bluntly: the internal health benefits of sensible sun and UVB “far outweigh” the manageable risk of treatable skin cancers. It leaves a simple question hanging: are you getting the right kind of light in your life?