What is the maximum height of a human

　　How tall are the famous giants in the world? For example, Robert Pershing Wadlow of the United States is 272 cm tall; Leonid Stadnik of Ukraine is 257 cm tall; Bao Xishun of China is 236 cm tall. In this way, no one can be taller than 3 meters. So, what is the maximum height of a human being?
　　How tall are the famous giants in the world? For example, Robert Pershing Wadlow of the United States is 272 cm tall; Leonid Stadnik of Ukraine is 257 cm tall; Bao Xishun of China is 236 cm tall.
　　 In this way, no one can be taller than 3 meters. So, what is the maximum height of a human being?
　　Human height has reached its
　　 peak Studies have shown that humans may have reached the height limit. Professor Jean-François Toussaint of Paris Descartes University led an interdisciplinary team. They reviewed 160 studies spanning 120 years and examined changes in human lifespan, physical fitness, and height over time. They found that throughout the 20th century, human lifespan, physical fitness, and height have increased steadily. However, since 1980, these three indicators have stabilized and have not changed much for more than 30 years. Despite the continuous advancement of medicine and science, and the enhancement of nutrition, human lifespan, physical fitness, and height have not increased significantly. This means that modern society has pushed the human species to its limits.
　　 Another study showed that Japanese people have reached their peak height and will not grow taller. The study looked at trends in the height of 17-year-old Japanese men over a decade and found little change. The study believes that the current environmental factors (nutrition, lifestyle, etc.) in Japan have reached this better state, so there are no external factors that can affect height.
　　 For another example, during World War II in the mid-20th century, Americans were taller than other developed countries. Today, the average height of men in the United States is 176 cm, and the average height of women is 163 cm, far behind the Netherlands.
　　Why don’t humans grow taller forever?
　　 From one meter five to two meters, it is about the height range of human beings. Robert is the upper limit of human height in the world. So, why don’t humans grow taller forever?
　　 Let’s look at a set of research analysis: if fleas are enlarged 10 times as they are, they will not be able to jump on trees; if swallows are 10 times larger, they will not be able to fly freely; if mice are 10 times larger, they will fall off a tall building. No longer will be safe and sound.
　　 Looking at the sluggishness of the “giant” in reality, we will understand that the tall stature is enough to greatly reduce the flexibility and agility of human beings. The skin area cannot be increased in the same proportion as the body weight, which naturally brings difficulties in heat dissipation, which is why people with large bodies are particularly afraid of heat.
　　 The problems are far more than these. We know that giraffes need a high blood pressure of 260 cm of mercury to send blood to their heads. Tall people also undoubtedly need higher blood pressure and tougher blood vessels to avoid insufficient blood supply to the brain. Excessive limbs can cause poor venous return and poor peripheral circulation, and large bodies require more blood supply. In this way, people who get the reputation of being big and tall have to increase the burden on the cardiovascular system at the cost. In fact, the simultaneous increase in burden also includes the digestive system, respiratory system, urinary system and other systems.
　　 In addition, paleontologists tell us that the ancestors of dinosaurs were originally small people. After hundreds of millions of years of continuous development and evolution, they became the largest animals in the history of life, and finally went extinct. Today’s elephants, giraffes, and giant pandas in the world all had flexible and compact bodies at the beginning, and with the “expansion” of themselves from generation to generation, they have gradually become rare and protected animals. It can be seen that the increase of the body is not conducive to the survival and reproduction of the species.
　　 Scientists have found that the ideal height for humans is 168 cm.
　　Can changing genes break the height bottleneck of humans?
　　 A biologist discovered an abnormality of chromosome 17 when studying 23 pairs of chromosomes in the human body. On chromosome 17, there is a gene called P53, which specifically inhibits human gigantic growth. If you change this gene, can you break the current height bottleneck of humans?
　　 In fact, the p53 gene is an important anti-cancer gene, its wild type can make cancer cells apoptosis, thereby preventing cancer. It also has the function of helping cells genetically repair defects. To put it simply, P53 will synthesize proteins and can specifically detect whether the gene transcription is abnormal or not. Once a problem is found, it will be dealt with, ranging from repair to destruction. Therefore, if p53 is altered, or mutated, it increases the chance of cancer.
　　 So, the answer is already obvious. The existence of life is determined by genes, and genes are the “manipulators” of life. Once the genes are artificially changed, the consequences will be disastrous.