“Dr. Michael Holick’s enthusiasm for vitamin D can be fairly described as extreme. The Boston University endocrinologist, who perhaps more than anyone else is responsible for creating a billion-dollar vitamin D sales and testing juggernaut, elevates his own levels of the stuff with supplements and fortified milk. When he bikes outdoors, he won’t put sunscreen on his limbs. He has written book-length odes to vitamin D, and has warned in multiple scholarly articles about a “vitamin D deficiency pandemic” that explains disease and suboptimal health across the world.
His fixation is so intense that it extends to the dinosaurs. What if the real problem with that asteroid 65 million years ago wasn’t a lack of food, but the weak bones that follow a lack of sunlight? “I sometimes wonder,” Dr. Holick has written, “did the dinosaurs die of rickets and osteomalacia?”