Compare the consequences of the stress response for people living in the modern world versus ancient times
In ancient times, stress usually involved physical danger, and the response to it was violent physical exertion. In the modern world, stress is seldom physical, but the body reacts the same way. Modern stresses may be a pop quiz or financial trouble. Under these stresses, you are not supposed to fight or run, as ancient ancestor did. But still, the heart races, and hormones flood the bloodstream with glucose and fat. A common enemy today is not a saber-toothed tiger but a disease of modern civilization: heart disease. In modern times, stresses that strain the heart often lead to heart attacks, especially when a body accustomed to chronic underexertion experiences sudden high blood pressure.
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