年轻人的十大死因──包括机动车事故、他杀和自杀──都是可以预防的问题，牵涉到判断力，与疾病无关。

Adolescent and 20-something brains are also particularly vulnerable to trauma, abuse, alcohol and drugs. Brain scans have shown that heavy drinking, defined as 20 or more drinks a month, in young people can lead to decreased cognitive function, memory and attention.

青少年和20来岁青年的大脑也尤其容易受到心理创伤、虐待、酒精和毒品的侵害。脑部扫描显示，年轻人酗酒（界定标准为一个月喝酒达20瓶及以上）可以导致认知功能、记忆力和注意力的减退。

Some 20-somethings also are laying the groundwork for later health problems. About three-quarters of young adults are overweight, raising their risk of later obesity, and about 25% smoke cigarettes.

一些20来岁的年轻人正在为自己以后的健康问题埋下隐患。大约3/4的年轻人体重超标，增加了今后患肥胖病的危险，吸烟的年轻人约占25%。

Some severe mental illnesses also become apparent between ages 15 and 25. Early warning signs of schizophrenia include hallucinations, sudden hostility and suspiciousness, blank stare and incoherent conversation. Bipolar disorder involves cycles of depression with recklessness and impulsivity, such as excessive spending.

一些严重的精神疾病在15-25岁年龄段也开始变得明显起来。精神分裂症的早期征兆包括幻觉、突发敌意与疑心、茫然盯视及说话语无伦次。躁郁症则是在心情抑郁与鲁莽冲动（比如过度消费）之间交替循环。

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