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The next time you feel stress and anxiety riding on your shoulders, pick up a coloring book. Seriously, they're not just for kids anymore. Adult coloring books are the new way to unwind, and many health experts are on board.

A handful of studies have shown that the effects of coloring could be positive: Participants in one study took a baseline test to measure anxiety levels, and then increased their anxiety levels by describing a scary experience. Immediately after, they were randomly assigned to color either a blank page, a design, or intricate...