However, do keep in mind that for whatever reasons many are not absorbing from the sun either ... in these cases a thorough workup needs to be done with one's doctor to rule out other areas such as parathyroid disease, etc.
C~
Vitamin D isn't obtained from food -- it's obtained from exposure to the sun. Some foods have Vitamin D added to it, but the way we're supposed to get it is to get outside on a sunny day.