What is up with Vitamin D?

What is Up With Vitamin D? The other day I was consulting with a new client (I’ll refer to her as Julie) about her recent lab work. One thing Julie had a concern about was her Vitamin D level…which was considerably low. Julie wondered how these levels could be so low since she played hours of tennis outside every day. She explained how she was out in the sun daily with only SPF 15 sunscreen. She thought she was getting enough sun…yet was she? It seems in today’s world that everyone is deficient in Vitamin D. I live in the sunniest place on earth, San Diego, and everyone I speak with has some level of Vitamin D deficiency. Knowing we can synthesis our own Vitamin D from the sun, why are we all so deficient? Who or what is to blame about this? Is it too much sunscreen? Poor diet? Liver problems? Kidney issues? Some combination of all four factors? Let’s go deeper so we can see…What is up with Vitamin D? What is Vitamin D? Vitamin D is an essential nutrient obtained from food or sunlight. Vitamin D can be attained by plant sources as ergocaliciferol (D2) and animal sources as cholecalciferol (D3). Its main function is to regulate calcium and phosphorous in the bloodstream and to promote healthy bone formation. With adequate amounts of sunlight, the body can synthesize Vitamin D. By definition vitamins must be obtained by the diet since they cannot be synthesized in sufficient amounts by the organism. This makes Vitamin D unique, since it can be obtained from a source outside of food...