Hi guys!I am He Jingzhi, the founder of the Transforming Profession, dedicated to studying human behavior and promoting human growth.
In the previous article (different skin tones8), we focused on the conjectures that questioned the role of melanin, especially the neural tube defect incident of a newborn baby in an Argentine hospital.
As is customary, I will first answer the previous reflection (how do you think the sun affects melanin through **).
If it is not directly affected, then it will be indirectly affected by other physical factors.
Okay, let's move on to a new explanation.
Continued from: There is only one answer, **
In fact, while the sunlight in summer is just as dazzling as in winter, the amount of UVA light varies dramatically. The amount of long-wave ultraviolet rays is the lowest in summer, and the content is relatively highest in winter, and long-wave ultraviolet rays can penetrate the atmosphere directly to the earth, after which, long-wave ultraviolet rays will continue to penetrate people's **, directly into the body, and penetrate into every blood vessel, and then destroy an important substance in the blood - folic acid.
As we all know, folic acid is one of the essential B vitamins for the human body, and it is an acidic substance that can be extracted from spinach leaves. However, the human body cannot synthesize.
Fortunately, folic acid is widely available in nature. It is abundant in green leafy vegetables, mushrooms, liver, legumes, nuts, and is generally not symptomatic of folate deficiency in omnivorous humans. However, folic acid has one very important characteristic:
It can be easily broken down by UVA light. Experiments have found that after one hour of exposing serum to the scorching sun, folic acid concentrations drop to abnormal levels. Unfortunately, most people don't know that folic acid is essential for DNA synthesis and is indispensable to any cell. If it's just ordinary cells**, such as epidermal growth, then forget it, it's not a big deal to have a few crooked melon cracked jujube cells, the key is that germ cells also need to be constant**.
For healthy and normal men, hundreds of millions of sperm are produced every day, and the need for folic acid is not great. Once folic acid is deficient, not only the number of sperm decreases, but the proportion of abnormal sperm will also increase dramatically, and many sperm will be indiscriminately filled and have no ability to fertilize. The fate of being a waste after the shot is inevitable. Therefore, men should try to spend as little sun as possible during the preparation for fertility, and at the same time smoke less alcohol, which will quickly consume folic acid, which will lead to male infertility in severe cases, or lead to the production of up to 1 3 unqualified sperm, and eventually lead to a sharp increase in the probability of miscarriage in pregnant women.
However, the real concern is not the lack of folic acid in men, but the women, especially those who are pregnant. Men have a large sperm count, and damage caused by a lack of folic acid is a small probability event. Women are different, they only release one mature egg a month) Once fertilized, the fertilized egg will continue to be affected by the lack of folic acid.
Whereas, the fetus's body is in a state of rapid cell ** almost all the time during the womb. At this time, the woman's fair-skinned ** will show another effect. Since the white temporary ** cannot intercept more long-wave ultraviolet rays, once the long-wave ultraviolet rays enter the pregnant woman's body, it will destroy more folic acid in the pregnant woman's body;Therefore, the pregnant woman must prepare another spare serving of folic acid for the fetus, and the dosage is of course larger;In addition, estrogen destroys folic acid.
Once the above situation occurs, folic acid will suffer from "falling apart" in the woman's body, which is why pregnant women are more likely to have folic acid deficiency, their need for folic acid is 5 times that of normal people, once deficient, there will be various fetal malformations, and even produce anencephaly.
According to the U.S. Health Agency, 15% of neonatal deaths are due to folic acid deficiency. Adding folic acid-rich foods to a pregnant woman's diet can reduce the risk of developing malformed babies by 75%, which shows that folic acid is a very important natural selection factor. ......That is exactly what happened to the three unfortunate mothers in Argentina
Thoughts on this issue: What other effects do you think folic acid has for humans?
The only two references:
A History of Madness Human Evolution