同時也這個研究也沒有探討在年老之前,這些健康生活習慣對壽命的影響。 儘管如此,Gisele Wolf-Kle(a director of geriatric education for the North Shore-LIJ Health System in New Hyde Park, N.Y)說:「這個研究提供一個證明就是,促進健康與延長壽命,縱使你年紀很大了才開始行動,永遠都不會太晚』。且很久以前我們就知道,不論任何年紀,開始調整好生活行為,對健康與壽命都是有益處的。 Gisele Wolf-Kle舉他的老師為例,他的老師有吃一些老人病的藥,且有吸菸,直到他70幾歲時一次重大的心臟病發作後,他戒菸,然後每天花30分鐘騎飛輪車或健身車(stationary bike),直到現在還保持這個習慣,如今他94歲了!」
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費雪兄弟進行廣泛的調查,研究四十多位知名的喜劇演員與小丑,包括席德.西薩(Sid Caesar)、傑奇.梅森(Jackie Mason)、小丑布林可(Blinko the Clown),並出版《假裝世界永遠滑稽》(Pretend the World Is Funny and Forever )一書發表他們的研究。
很多人都曾經對喜劇根本上和憂傷與精神病有關的說法提出質疑,費雪兄弟並不是唯一的學者。佛羅里達國際大學的詹姆斯.羅頓(James Rotton)深入探討霍夫曼(Hoffman)的《過往娛樂名人》(Entertainment Personalities of the Past),了解知名喜劇演員的出生與死亡年份,並以同年出生的非喜劇藝人當對照組註一。
羅頓在名為〈幽默與長壽:搞笑演員較長壽?〉(Trait Humor and Longevity: Do Comics Have the Last Laugh?)的論文中說明研究的結果,他主張喜劇演員和其他藝人的死亡年齡差不多。後續關於喜劇演員死因的研究註二也顯示,他們並沒有比較常因心臟病、癌症、肺炎、意外或自殺而身亡。
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總之,沒有證據顯示每晚必須搞笑演出的明顯壓力會讓他們比較短命。
其他研究顯示,能夠笑看人生可以減少不安,羅頓的研究也呼應了這點。如果喜劇真的有影響,那麼就是有益健康。十三世紀的亨利.德.曼德維爾醫生(Henri de Mondeville)推測笑有助於病人康復,他寫道:「外科醫生應該禁止病人生氣、怨恨與難過,提醒病人歡樂可以讓人心寬體胖,哀傷讓人瘦骨如柴。」