Why zebra does not have a heart attack. Psychology of stress

It turns out that evolutionarily people are predisposed to react and avoid the threat, as the zebras do. We must relax most of the day and run as crazy only when the danger approaches.
Zebra from time to time an acute stress reaction (physical threats) arises. On the contrary, we have a chronic stressful reaction (psychological threats) rarely reaches such quantities as Zebra, but does not disappear anywhere.
zebras die quickly, falling into the paws of predators. People die more slowly: from coronary heart disease, cancer and other diseases that occur due to chronic stressful reactions. But when stress is predictable, and you can control your reaction to it, it does not affect the development of diseases so much.
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