発酵食品を食べると、体調がいい。
そういうお声はよく聞きます。発酵が終わっているので、消化器への負担も少なくて済むのだとか。
Today we received a reader’s question regarding yogurt.
質の良いヨーグルトを毎日食べるようになり、汗臭さを感じなくなりました。（汗の中の雑菌どこいった？）
ヨーグルトを食べているときは肌がモチモチします。何故でしょう？
Mr. C.
Thank you for your question.
I will answer loosely and not too rigidly today.
Table of Contents
- Yogurt and sweat odor
- Yogurt and beautiful skin
- Yogurt and Bacteria
- Yogurt bacteria do not live in the intestines Problem
- It doesn’t matter if you don’t inhabit it.
- The relationship between the Japanese and yogurt
- Call for Questions
Yogurt and sweat odor
I see that yogurt has reduced the smell of sweat. I am very envious.
I often say to my sister, “It smells like a gymnast’s club room. I think it might be arousal. Kim Taku had armpit cancer, too, and it seems it can be easily cured with surgery,” and she would recommend surgery from afar.
We live apart now, but when we see each other and hug, we hug with our armpits tightened (not very effective, apparently). (I hear it doesn’t work so well.)
では、私もヨーグルトを食べればいいんでしょうか？
残念ながら、数年前まで1日600gほど無糖ヨーグルトを食べていましたが、脇臭はピンピンしています。（その後自分の中でブームが去り、現在3日で1パックぐらい食べる）
Now, why does sweat smell?
You wrote in your question, “Where are the germs in the sweat?” but in fact, the sweat itself is almost odorless.
There are two types of sweat glands, of which apocrine glands, which are abundant in the armpits and other parts of the body, produce a mixture of lipids, proteins, carbohydrates, and ammonia, which produce odor when they are broken down by bacteria. (1)
The other type, eccrine glands, are sweat glands located throughout the body. From here, water and salt-based sweat is produced. This is why sweat from the neck and arms is less smelly.
So it seems possible that by changing what we eat, we can change the ingredients that appear in our sweat and thus prevent the bacteria from producing too many smelly ingredients.
ただ、効果が出るかどうかは人それぞれっぽい。質の良いヨーグルトってのが肝なんやろか。
私は「その時スーパーで安いやつ」を食べてただけなんで。
Yogurt and beautiful skin
Yogurt and chewy beautiful skin.
That’s nice.
The only article I could find on this relationship was about yogurt makers, so I’ll leave the details to the next paragraph.
There is also a paper (2) that collected and analyzed papers on fermented foods and beautiful skin, but concluded that the number of studies was too small to be accurate.
However, there were lots of articles about how applying yogurt to the face makes the skin beautiful.
It’s a waste, but if you eat it after the pack, you kill two birds with one stone, right?
No, you don’t eat.
Yogurt and Bacteria
Now, there are many discourses about yogurt and health, and they are complex.
In this section, I will focus on the bacteria in yogurt in terms of their effect on intestinal bacteria.
In other words, we will consider “the possibility that the balance of intestinal bacteria has been improved by eating yogurt, resulting in reduced sweat odor and improved skin quality.
18世紀後半〜19世紀前半に活躍したロシアの微生物学者メチニコフは、ブルガリア人が長寿なのはヨーグルトのおかげだと信じ、毎日たっぷりヨーグルトを食べていました。
彼は71歳で心不全で亡くなりましたが、細菌にはエエ働きをする人たちもいると信じていました。(3)
残念ながら、その思想は1928年に抗菌薬（抗生物質）が誕生したことで一旦忘れられてしまうんですが…
In fact, there are quite a few studies showing that eating yogurt has changed the composition of intestinal bacteria.
Yogurt bacteria do not live in the intestines Problem
Have you ever seen a study showing that eating yogurt increases the ratio of lactobacilli and bifidobacteria among the intestinal bacteria in a person’s feces?
Yogurt makers are paying for this kind of research.
My poop did not increase those ratios at all, even in the days when I was eating 600 grams of yogurt a day, but some people certainly do.
Why?
That is because the yogurt they ate went into their stomach, into their intestines, and came out in the form of poop.
Bacteria killed by stomach acid can also be detected in the intestinal flora test (in the case of the 16S rRNA test).
Unlike the “zutto-friend” bacteria we acquired as infants and toddlers, the bacteria in yogurt are our one-summer love partners that we met during our summer vacation part-time jobs.
When you stop eating, the lactobacilli and bifidobacteria disappear.
When you stop working part-time, your summer romance ends.
That is what you meant when you said in your question “when I eat yogurt”.
It doesn’t matter if you don’t inhabit it.
Now, what’s the point if it doesn’t dwell?
That is not true.
食べたものに含まれる菌たちは、うんちとして出ていくまでにいろんな仕事をします。（彼らを通過菌と呼ぶ）
だいたいは胃酸で死んでしまいますが、彼らの死骸は他の腸内細菌たちのごちそうになります。
And some of the bacteria survive and reach the intestines, where they multiply and produce beneficial substances called “metabolites.
This metabolite may help you feel better.
ほな、代謝産物だけ食べたらいいんちゃう？ という発想で作られているのがポストバイオティクスです。
たしかに理にはかなっています。
However, as mentioned above, not only the metabolites of yogurt bacteria are good, but also the metabolites produced by intestinal bacteria that eat their carcasses, so some people feel yogurt is more effective.
Incidentally, there are also a few fungi that take up residence by chance. This is the pattern of a one-summer romance that ends in a goal.
The relationship between the Japanese and yogurt
Nationality and race are important to note when considering the issue of intestinal bacteria.
When did Japanese people start eating yogurt?
It should be very recent.
Japan lost the war, so from the postwar period until now, Japan has been educated to consume wheat and dairy products under the U.S. initiative.
The speed of evolution of bacteria is so fast that perhaps yogurt bacteria may have already fit the Japanese constitution. (Yogurt is less likely to cause symptoms of lactose intolerance than cow’s milk.)
On the other hand, the Bacillus subtilis in natto, the lactic acid bacteria in pickles, and the yeast and lactic acid bacteria in miso may perhaps be more suitable for the body.
Try it if you like.
I’m not a huge fan of pickles, so I prefer yogurt.
Call for Questions
We invite questions from our readers!
Anything related to intestinal bacteria, or more broadly, microorganisms, scientific research, or the company!
Your question is from the X (formerly Twitter) account, which is run by another staff member, or from there,
From the comments section of NOTE!
Column] My armpits may be smelly! How to prevent armpit odor that bothers you right now. Rohto: Product information site. Accessed August 30, 2024. https://jp.rohto.com/learn-more/bodyguide/nioi/prevention/
2. R V, K S. Effects of Fermented Dairy Products on Skin: A Systematic Review. J Altern Complement Med. Published online July 2, 2015. doi:10.1089/acm.2014.0261
3. Mackowiak PA. Recycling Metchnikoff: Probiotics, the Intestinal Microbiome and the Quest for Long Life. Front Public Health. 2013;1:52. doi:10.3389/fpubh.2013.00052
This blog post is a partially modified version of an article written by a researcher in the Microbiology Division of Symbiosis, Inc. in NOTE.
The original post can be found here.
Article Title: Babies and the Microbiome: The Weight of the “First 1000 Days”
Article Link:https://note.com/symbiosis17/n/n003e46559b66
