

しばし孫育てからの休暇の旅路に夫婦で向かっております。
昨日、102歳の一族の最長老の叔父との会話のことを書き、多くの方から「102歳ですか〜」という驚きの声をいただきました。たしかに平均からは突出しているかも知れませんが、最近のわたしたち70-80年代も実際に平均寿命と「健康寿命」がどんどん伸びてきている。その原因として若年成長期での「栄養状態」の改善が大きいという説があると書きました。それについて読者の方から疑問の声がありましたが、自宅札幌から函館まで、およそ400km弱のゆるゆるあちこち寄り道三昧の旅路・ロングドライブ中で「論拠」的な返信ができずにいました。その意味で、お詫びいたします。で、ホテルで落ち着いて。
わたし的にはこの説に納得しているのですが、ひとつの「説」であることは事実でしょう。
AIの回答を借りれば、〜高齢者の寿命の伸びに成長期(幼少期〜思春期)の栄養状態の改善が大きく関与しているという説は、公衆衛生学や疫学において確実な科学的根拠があるとされる〜とのこと。根拠引用として、理化学研究所HPが紹介されている。
専門的には「DOHaD(健康と疾患の発生起源説)」や「コホート効果(世代効果)」として世界中で研究されており、幼少期の栄養状態が数十年後の高齢期の死亡率を左右することが実証されているとのこと。(理化学研究所の論文解説などでも紹介されている通り)。
かつて日本人に脚気が多かった時代、それを伝染病由来と捉えて対策が遅れた結果、日露戦争では(責任者として森鷗外の名も記されている)戦闘による戦死者を上回るほどの病者・死者を出したという歴史的教訓もあるとされていた。日本の学問の中に「栄養学」という概念がまだ存在していなかった時代の悲劇という認識。
要するに「栄養学」という考え方が日本の学会に存在してこなかったのでしょう。
この情報を知ってわたしは庶民感覚として強い興味を覚えていた。そういうことで叔父の健康ぶりを見ながら、その「枕言葉的な説」引用として書いた次第。この説をどう捉えるかは読者の皆様のご判断にお任せします。
写真は、道南の恵山で見た観音像と、路傍にあった地蔵。
日本人として庶民の、いのちに対しての向き合い方はこういった心象なのでしょう。高齢期になってきてごく自然にこういう心象へ近づいていく次第。とくに「路傍の地蔵」に耽溺させられます。
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English version⬇
[A Trip to Southern Hokkaido to Admire Houseplants; My Heart Is Drawn to Two Buddhist Statues]
I listened to a 102-year-old elder speak about “how to face life” in old age, and my understanding of nutrition and health has deepened. I pray that I may one day become a Jizo statue by the roadside. …
My husband and I are currently on a short vacation together, taking a break from helping raise our grandchildren.
Yesterday, I wrote about a conversation I had with my uncle—the eldest member of our family at 102 years old—and received many surprised reactions from readers saying, “102 years old?!” While that may indeed be well above average, for those of us in our 70s and 80s today, both average life expectancy and “healthy life expectancy” have been steadily increasing. I wrote that one theory attributes this largely to improvements in “nutritional status” during early childhood. Some readers raised questions about this, but since I was on a long, leisurely drive from my home in Sapporo to Hakodate—a journey of just under 400 km filled with plenty of detours—I wasn’t able to provide a well-reasoned response. I apologize for that. Now that I’m settled in the hotel…
Personally, I find this theory convincing, but it is, after all, just one “theory.”
According to an AI response, “the theory that improvements in nutritional status during the growth period (from childhood through adolescence) play a major role in the increase in life expectancy among the elderly is considered to have solid scientific evidence in public health and epidemiology.” As a source of evidence, the RIKEN website is cited.
From a technical standpoint, this is being researched worldwide under the terms “DOHaD (Developmental Origins of Health and Disease)” and “cohort effect (generational effect),” and it has been demonstrated that nutritional status during early childhood influences mortality rates in old age decades later (as described in RIKEN’s paper commentaries and other sources).
There is also a historical lesson from a time when beriberi was prevalent among the Japanese population: because the condition was mistakenly perceived as an infectious disease, countermeasures were delayed. As a result, during the Russo-Japanese War (with Mori Ōgai listed as one of those responsible), the number of people who fell ill or died from beriberi reportedly exceeded the number of combat-related fatalities. This is recognized as a tragedy from an era when the concept of “nutrition science” did not yet exist within Japanese academia.
In short, the concept of “nutrition” likely did not exist within Japanese academic circles at that time.
Upon learning this information, I felt a strong sense of curiosity from the perspective of an ordinary person. That is why, while observing my uncle’s good health, I wrote this as a reference to that “bedtime story-like theory.” I leave it to the readers to decide how to interpret this theory.
The photos show a Kannon statue I saw at Mt. Esan in southern Hokkaido and a Jizo statue by the roadside.
As a Japanese person, I believe this is the kind of mindset ordinary people have toward life. As I enter my later years, I find myself naturally gravitating toward this way of thinking. I am particularly captivated by the “Jizo by the roadside.”
● Announcement
My book, *Writers and Living Spaces*, has been published as an e-book by Gentosha.
Available on Amazon.
Posted on 11月 4th, 2026 by 三木 奎吾
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