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[ 男と女の物語 ]
Posted;2004年03月11日
閉経後の女性が長生きして得する訳
女性特有の生理と呼ばれる現象がある。そんなつらい生理であっても閉経を迎えた女性は自分が女でなくなったように思い、しばしばショックを受けると聞く。しかし、実は閉経後の人生こそが彼女たちの新たな活躍の場なのかもしれない。つらい生理痛から解放されることだけが、閉経を迎えた女性が得する理由ではないようだ。もしかしたら、人類の未来につながるもっと大きな理由が潜んでいるのかもしれない。
3月1日号のNatureにトルク大学(フィンランド）のM Lahdenperaたちが発表した報告によると、閉経後に長生きした女性ほど孫の数が多く、自分の子供たちが子育てするのを手助けして結果的により多くの遺伝子を後世に残せるらしい。また、自分の子供たちが更年期に達した頃に（安心して？）死亡するのだという。
人間の女性が生殖力を失ったあとも長いこと生き続けるのは、自分の子供を生み続けるよりも孫を育てる方が合理的に子孫を残せるからだと考えられる。
▼Nature 428, 178 - 181 (11 March 2004); Fitness benefits of prolonged post-reproductive lifespan in women [要登録]
▼ネイチャージャパン：長生きおばあちゃんの秘密
ｰｰｰｰｰｰｰｰｰ
我が家のおばあちゃんは孫の面倒を良くみてくれて非常に助かる。新米ママの子育て相談に乗ったり実質的な手助けはほとんどおばあちゃんの役割だ。
じゃあ、おじいちゃんは？
おじいちゃんには生殖能力があったとしても、果たしてどのくらいのおじいちゃんがその能力を発揮しているのだろうか？浮気をしない限り、有効に生殖能力を使うことが出来ないじゃないか。
それを発揮しているおじいちゃんは性欲旺盛な政治家か歌舞伎役者か？
それとも、多くのおじいちゃんはどこかで子供でも作っているのだろうか？
そんな変な疑問が沸いてきた。果たして自分がおじいちゃんになって長生きすると人類にとって何が特になるのだろうか？
おじいちゃんになった時、浮気による隠し子で子孫繁栄に協力するよりも「知識と経験から世のお役に立てるようになっていたいものだ」とそんなことを考えた。
===番外===
Natureの同じ号に、優雅に年をとりましょう。という記事が出ていた。詳しく見ていないが、これからは高齢者の病気を単に治療するのではなく健康に老いる準備も必要だということのようだ。
▼Nature 428, 116 - 118 (11 March 2004); Ageing: Growing old gracefully
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質の高い長生きをしたいものだ。
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