How does the fight-or-flight response affect aging?

We humans have a natural, built in defense mechanism -- the "fight-or-flight" response in which the body primes itself to respond successfully to a dangerous situation, and come out alive. Perhaps surprisingly, these huge but fleeting stresses do not age you. You are simply using one of your body's systems as it was meant to be used.

When you have an important-but-manageable life event (IBMs) such as a near-miss which is scary but from which you don't suffer an injury, it does not affect your rate of aging. The problem arises instead when you are in a "fight-or-flight" state not just occasionally and briefly, but constantly. The important issue, therefore, is not whether you experience stress, but over how long a period of time.

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