Optimism's benefits for physical health also extend beyond heart health, such as improved immune system function and increased life span.

乐观对身体健康的益处不仅限于心脏健康，还包括改善免疫系统功能和延长寿命。

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However, excessive stress can cause physical symptoms, it can damage your immune system and make you ill.

但是过度的压力会引发身体症状，削弱你的免疫系统，让你生病。

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It boosts your immune system: Smiling really can improve your physical health, too.

笑可以增强免疫系统：笑还能够改善身体健康。

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What happens when we have a strong physical immune system?

如果我们有强大的生理免疫系统会怎样？

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The immune system is stronger, so it also helps in terms of physical health.

免疫系统更强，所以对身体健康也有帮助。

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Over at the excellent British Psychological Society Digest, psychologist Christian Jarrett introduces us to a group of 12 elderly folks whose brains appear to be immune to the physical effects of aging.

FORBES: Meet the "SuperAgers": Elderly People Whose Brains Don't Age

The belief that we are relatively immune to future harms can also put us at physical risk.

CNN: Why we fool ourselves into optimism