Most headlines about vitamin D focus on the same question: “Does it prevent cancer or heart disease?”And most headlines give the same answer: “No benefit shown.”But what if we’ve been asking the wrong question? In today’s episode, we take a deeper look at the data including the massive VITAL trial of 25,000 adults and explore why a 5-year study may simply be too short to measure the effects of a nutrient that works on decades-long biological processes like atherosclerosis, neurodegeneration, cancer development, and immune aging.