Laughter can make people feel happy and is also good for the heart because it prolongs① life while depression is not good for the health and even increases the risk of an early death.
A good bout of laughter every day provides similar cardiovascular benefits as exercise because it stimulates② the blood flow.
On the other hand， depression—or the lack of laughter—is often linked to unhealthy habits such as smoking and drug addiction③ and increases the risk of death by 44 percent.
Laughter produced a magnitude④ of change in the endothelium⑤， similar to the benefit we might see with aerobic activity， but without the aches， pains and muscle tension associated with exercise.
While laughter should not replace exercise， we should do both regularly at the same time. We do recommend that you try to laugh on a regular basis. 30 minutes of exercise three times a week， and 15 minutes of laughter on a daily basis is probably good for the vascular⑥ system.
① prolongvt. 延长，拉长；拖延
② stimulatevt. 刺激；激励；使兴奋；促使［(+to/into)］ vi. 有刺激之作用；起促进作用
③ addictionn. 沉溺；成瘾；上瘾；入迷
④ magnituden. 重大，重要；巨大，广大
⑤ endotheliumn. 【解】内皮
⑥ vascularadj. 脉管的；血管的；充满活力的
笑让心脏更健康
笑能使人精神愉悦，同时还对心脏大有好处延长寿命；相反，心情沮丧则不利于身体健康，甚至会增加早死的危险。
笑给心血管带来的好处就像锻炼可以给心血管带来好处一样，因为笑可以促使血液流通。
心情沮丧或缺少笑容却常常与诸如抽烟、吸毒等不健康的生活习惯联系在一起，同时还会将死亡的危险增加44％。
笑会在心内膜内引起某种变化，其效果和做有氧运动时差不多，但笑可以使我们远离由运动带来的伤痛和肌肉紧张等不良影响。
笑也不可能取代体育锻炼，两者应该有规律地同时进行。建议人们尝试着有规律的笑。并且一周进行3次体育锻炼，每次30分钟；另外，每天要笑15分钟，这样会对人们的脉管体统大有裨益。
