Dr. Holick explains if people living north of Georgia will be able to absorb enough vitamin D from the sun during the winter season.
Well in the wintertime, of course, you wear more clothing. The sun’s rays are weaker, but when we did a study, we found that you have to live below Atlanta, Georgia to be able to make any significant vitamin D in your skin in the winter time. So basically if you live above Atlanta, Georgia, you cannot make vitamin D in your skin from November through February. If you live above New York City, you can’t make any vitamin D in your skin from about mid-October to almost mid-March to early April.
About Dr. Holick, Ph.D., M.D.:
Michael Holick, Ph.D., M.D., is the Professor of Medicine of Physiology and Biophysics at Boston University School of Medicine. He received his medical degree from the University of Wisconsin, Madison and performed his residency and fellowship at Massachusetts General Hospital. Dr. Holick specializes in vitamin D, calcium, bone metabolism, photobiology of vitamin, and osteoporosis. Dr. Holick is also the recipient of the American Skin Associations Psoriasis Research Achievement Award, the American College of Nutrition Award, the Robert H. Herman Memorial Award in Clinical Nutrition from the American Society for Clinical Nutrition, and more.
Visit Dr. Holick at his website