The hottest topic in medicine isn't the newest drug or the latest surgical device. It's vitamin D.
What brought the simmering debate to a boil was a 2007 study showing that people taking normal vitamin Dsupplements were 7% less likely to die than those who didn't take the daily supplements.
A year later, a major study found that when women with low vitamin D levels get breast cancer, they have a much higher chance of dying from their cancer than women with normal vitamin D levels.
That was surprising...