Are you D-ficient?

... walk in the sun, are African-American and otherwise dark-skinned, are older, or overweight, you don't get enough vitamin D. Vitamin D is necessary for the absorption of calcium and phosphorus for bone health. Rickets (a softening and weakening ...

http://www.triplicate.com/Northcoast-Life/Northcoast-Life/Are-you-D-ficient