You don't absorb calcium (which results in Ricketts or Osteoporosis)
What is Vitamin D mediated by?
The amount of solar radiation received and amount of melanin in skin
At higher ladititudes, what happens to people with darker skin?
They have a higher chance of developing Ricketts and Osteoporosis due to the lack of solar radiation. Lower solar radiation leads to less absorption of Calcium, which leads to Ricketts and Osteoporosis.
Where is darker skin favorable to have?
In areas with higher solar radiation or lower latitudes
What seems to mediate the quality of Folic acid?
The amount of solar radiation received and the color of skin.