As an article from FOX Weather reminds us, the time of year has come when much of the U.S. population can no longer produce adequate vitamin D naturally from the sun. Those north of the 37th parallel, or 37 degrees north latitude, will not receive enough direct sunlight to stimulate significant vitamin D production again until the spring. That means anywhere north of San Francisco, across the northern border of the Texas panhandle, to the northern border of North Carolina.

“This vitamin D deficiency is of particular concern for people who live in areas that don’t receive much direct sunlight, particularly when the seasons change. People who bask in plenty of sunlight during the summer end up experiencing a shortage of direct sunlight and vitamin D come fall, when the Northern Hemisphere is tilted away from the Sun,” writes Angeli Gabriel, FOX Weather Digital Content Producer.

Click here to read more from FOX Weather.

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