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　　免??(mian)疫?(yi)系?(xi)統(tǒng)??(tong)的??(de)核??(he)心??(xin)使??(shi)命??(ming)不??(bu)是??(shi)“消?(xiao)滅??(mie)一?(yi)切??(qie)”??，而??(er)是??(shi)識??(shi)別??(bie)敵??(di)我??(wo)、清??(qing)除??(chu)威??(wei)脅??(xie)??。??　　成??(cheng)年??(nian)期??(qi)是??(shi)免??(mian)疫??(yi)系??(xi)統(tǒng)?(tong)的??(de)“黃??(huang)金??(jin)時??(shi)代?(dai)”??，功??(gong)能??(neng)趨?(qu)于??(yu)穩(wěn)??(wen)定??(ding)??，但??(dan)不??(bu)良??(liang)生??(sheng)活?(huo)習??(xi)慣??(guan)可??(ke)能??(neng)引??(yin)發(fā)??(fa)“隱??(yin)形??(xing)危??(wei)機?(ji)”??。??這?(zhe)一??(yi)時?(shi)期??(qi)的??(de)免??(mian)疫??(yi)特??(te)點??(dian)主??(zhu)要??(yao)是??(shi)兩??(liang)個??(ge)方??(fang)面??(mian)??，一?(yi)是??(shi)胸??(xiong)腺?(xian)萎??(wei)縮??(suo)??，新??(xin)生??(sheng)T細??(xi)胞??(bao)減??(jian)少?(shao)??，依??(yi)賴??(lai)記??(ji)憶??(yi)T細??(xi)胞??(bao)應?(ying)對??(dui)病??(bing)原??(yuan)體??(ti)；二??(er)是??(shi)慢?(man)性??(xing)炎??(yan)癥??(zheng)??，吸??(xi)煙??(yan)、肥??(fei)胖??(pang)、壓??(ya)力??(li)等??(deng)導??(dao)致?(zhi)低??(di)度??(du)炎??(yan)癥??(zheng)??，增??(zeng)加??(jia)糖??(tang)尿??(niao)病??(bing)、心??(xin)血??(xue)管??(guan)疾??(ji)病??(bing)風??(feng)險??(xian)??。。