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Stress and cortisol have been linked ever since early stress research identified cortisol as the main mediator of stress – that is, the main hormone the body releases when stressed. So, as the so-called “stress hormone,” managing cortisol levels may seem like the key to managing stress. Unfortunately, it isn’t that simple.

As a researcher, I’ve long been interested in how the body responds to stress. And, while cortisol does play...