Your body is designed to have an optimal (long life and health) mode. This includes exercise, nutrition, heart rate, blood pressure, blood sugar and many other features that we don’t fully understand.
Anything else is less than optimal for long life. Fear puts your body into overdrive. If you can outrun that lion or beat down that bully you may live longer than you would without that fear / adrenaline / heart rate boost / and everything else that goes with it.
Generally fear makes your body ignore long term health in favour of short term performance (fight / flight / mate). Stress is just another word for long term fear. It tells you body to ignore long term good health conditions.
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