食魚會使人變得更聰明,這句說話很大程度上可能是建基於不少魚類含有大量OMEGA3脂肪酸。680Please respect copyright.PENANAKAfHQpWVr2680Please respect copyright.PENANA7hU9PEyqHr
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DHA是OMEGA3脂肪酸的一種,有實驗證據(Ref1)顯示有助老鼠大腦發展,故此被推算能預防人類腦退化症的發生,又或者輾轉被認定可以使人變得更加聰明。680Please respect copyright.PENANA2DHXilcYGS
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無論如何,媒體廣告經常渲染DHA對人體非常有益,尤其是標榜魚肝油產品含有好多DHA,非常值得進食,這究竟可不可信呢?680Please respect copyright.PENANAAhFyxbo8aQ
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(圖2)基於個別某幾種蛋白酶數量不足的關係,我們的腦部只能產生極為微量的DHA,而肝臟亦只能夠產生相對少量DHA,因此DHA的獲取來源主要均依靠飲食得來。680Please respect copyright.PENANAJ8AJ0IINQU680Please respect copyright.PENANAGJJBD0zMjy
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但有研究發現(Ref1,2),餵飼老鼠DHA的話,血液、心臟及肝臟DHA含量雖然的確有所提高,但腦部的DHA水平則無任何大變化。680Please respect copyright.PENANAMAbwvMNLXq
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若然DHA無法進入腦部的話,亦沒能夠為大腦帶來正面影響。680Please respect copyright.PENANAbIe4KLanfO
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(圖3)經過一系列的研究後,科學家發現Mfsd2a是腦部負責從血管接收DHA的蛋白質(Ref3,4),它傾向接收與磷脂LPC結合的DHA,而不太傾向接納其他狀態的DHA。680Please respect copyright.PENANAcQkeixRpnr680Please respect copyright.PENANAJpYCEf2l2N
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這亦解釋得到,為何單獨餵飼老鼠DHA並不會引起腦部的DHA水平提升,原因是它並不是處於與LPC連結的狀態。680Please respect copyright.PENANAWw0QaFb9Mk
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然而,這個機制僅是腦部獨有,因此心臟、肝臟以及脂肪組織均能輕易有效攝取DHA,以及與磷脂LPC結合的DHA。680Please respect copyright.PENANAV9cZPNp4Qk
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(圖4)有研究(Ref5,6)指出,DHA與磷脂LPC的sn-2位置結合的話,DHA進入腦部的效果會更好。但亦有研究(Ref1)指sn-1或者sn-2均無任何大影響。680Please respect copyright.PENANAsCpZxt9PF8680Please respect copyright.PENANAVx9KzNSR1q
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這些在老鼠大腦進行的研究,能否百分百套用在人類身上還是未知之數。680Please respect copyright.PENANASJBueXoEF0
但若然初心是想讓大腦攝取DHA的話,選購健康產品的時候還是留意一下究竟相應的DHA究竟是處於甚麼狀態為好。680Please respect copyright.PENANArseAPbHq37
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至於日常飲食的話,磷蝦油(Krill Oil)則對比魚油相對上含有較多與磷脂結合的DHA。680Please respect copyright.PENANAchfFukcike
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吃魚會使人變得更聰明,日後可能要改寫成為磷蝦了。680Please respect copyright.PENANAtYBF04MqTn
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Ref1:https://www.nature.com/articles/s41598-017-11766-0680Please respect copyright.PENANA1I3lC3JvZ5
Ref2:https://www.sciencedirect.com/science/article/pii/S0098299717301358#bib304680Please respect copyright.PENANAmVt97MEWRT
Ref3:https://www.nature.com/articles/nature13241680Please respect copyright.PENANAPPZMo2VrBU
Ref4:https://portlandpress.com/biochemj/article-abstract/345/1/61/34800/Characterization-of-plasma-unsaturated?redirectedFrom=fulltext680Please respect copyright.PENANAtFk7fXv9KE
Ref5:https://onlinelibrary.wiley.com/doi/abs/10.1111/j.1471-4159.1992.tb08353.x680Please respect copyright.PENANAatkibqi6eI
Ref6:https://journals.physiology.org/doi/abs/10.1152/ajpregu.1994.267.5.R1273?casa_token=1ZAjjbsr9IUAAAAA:GSyyUhEOi025bD-GJBWZFJqa8JrLt4HV9a9z3qqxJug7nP8x9bOoPUa1xJcixYkRJWXBWQ6ohZGHhw680Please respect copyright.PENANADwEoSpc38e