The Signal with Jonathan Jarecki

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Why Sunlight Beats Vitamin D | Dr. Roger Seheult

August 22, 2026

In this episode, my guest is Dr. Roger Seheult, MD, is a physician quadruple board-certified in internal medicine, pulmonary disease, critical care medicine, and sleep medicine, an Associate Clinical Professor at the University of California, Riverside School of Medicine, an Assistant Clinical Professor at Loma Linda University, and the co-founder of MedCram. Today, he explains why vitamin D levels strongly predicted COVID-19 outcomes while vitamin D supplementation largely failed to reproduc...

Bright Days, Dark Nights: How Light Controls Your Health | Dr. Sean Cain

July 31, 2026

In this episode, my guest is Dr. Sean Cain, PhD, a Harvard Medical School-trained expert in the impact of light on the human circadian system, a Matthew Flinders Professor at Flinders University, and Co-Founder and CEO of Circadian Health Innovations. Today, he discusses how people differ more than fiftyfold in how sensitive their circadian systems are to evening light, that nearly half of modern homes are bright enough at night to suppress melatonin by fifty percent, and that most of us have...

I Never Went to the Doctor Growing Up | My Mom Explains Why

July 27, 2026

My guest is my mom, Rosebud, a mother of four who spent fifty years building a life around preventative medicine. In this episode she tells her whole story: growing up with no money in Ozone Park, Queens; losing her father at three, her brother at thirty-two, and her first husband at twenty-five; and how that grief turned into a set of convictions about how she wanted to raise her children. We talk about the plant-based, vegetable-heavy way we ate growing up, the natural births, the years she...