One out in four adolescent girls reports suffering from symptoms of major depression. Girls and young women are twice as likely as boys and young men to suffer from anxiety. The girls are not okay, and there is an emerging neurobiological explanation for these troubling numbers. Donna Jackson Nakazawa, author of "Girls on the Brink: Helping Our Daughters Thrive in an Era of Increased Anxiety, Depression, and Social Media," discusses the crisis facing today's youth.

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