CHICAGO (WLS) -- About 70 percent of the world's population is vitamin D deficient, even those who live in sunny climates like Florida.
In her new book, "Vitamin D is the Key," Alice Branton says vitamin D is critical to good health. A lack of Vitamin D can lead to poor immunity, digestive issues, mood disorders and more.
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Branton, CEO of Trivdei Effect, sat down with ABC7 to talk about the importance of the vitamin in one's diet.