There is the expression “husband and wife”, which means that couples who live together for a long time tend to have a similar appearance. Nowadays, this has been scientifically proven that “husband and wife” is not a subjective assumption, and scientists have discovered the reasons behind the phenomenon. The study of “husband and wife” has been around for a long time. Scientists have given a variety of explanations, mainly the following: First, couples live together for a long time, eat, wear, work and rest time, the environment they live in are similar, the body, looks more and more consistent. The second is that couples often have the same emotions, so facial wrinkles are easy to agree, coupled with old age, many of the distinctive external features of people will disappear, such as subcutaneous muscles, hair, etc., the external appearance shows more skeletal features. Thirdly, when choosing a spouse at the beginning, people tend to choose the opposite sex whose physical features are similar to their own. Fourth, from the psychological point of view, there is an effect called “chameleon effect”, which means that we can easily imitate others, the more intimate people, the easier it is for us to imitate, couples imitate each other, the movements and looks and temperament will become more and more similar. The above is the previous theory about “couple’s face”. However, it is now widely believed that the most reasonable explanation is from the perspective of microorganisms. So, how do the flora produce “husband and wife”? Microbiological explanation is as follows: 1, living together to make the intestinal flora converge At the end of 2015, the journal Science had published an article, proving that in mice, living together does make each other’s intestinal flora converge, and have an impact on the body. Scientists implanted the same skin cancer cells under the skin of two groups of mice (containing different gut microbes) from different regions and observed the growth of skin cancer in the two groups of mice. After a period of time, it was found that the growth of skin cancer cells in group A mice was slow and somewhat inhibited; the growth of cancer cells in group B mice was very fast. After several experimental analyses, it was proved that group A mice had more bifidobacteria in their bodies, while group B mice had very few bifidobacteria, which can promote and strengthen the effect of immune preparations for tumor treatment. The researchers then mixed the two groups of mice and found that the tumor growth status in the two groups of mice tended to be the same after a period of feeding, with the cancer cells in group B growing slower and the cancer cells in group A growing faster than before. It was concluded that the colonies in the two groups of mice would tend to be the same after mixed breeding, and the colonies convergence had an effect on the bodies of the two experimental mice. Similarly, couples living under the same roof, breathing the same air, having similar work and rest schedules, and eating the same food most of the time, tend to form similar intestinal flora. Yin Ye, a famous microbiologist, said: couples can exchange 80 million bacteria with each other in one kiss. This shows that long-term conjugal life can make the flora in the body of both parties become highly consistent, thus affecting a variety of metabolism and function of the couple. 2, couples gradually form similar eating habits and tastes and similar intestinal flora in turn affects our eating habits. Some people compare the intestinal flora to the “forest” that grows in the lining of our intestines, which “forest” not only absorbs nutrients from the intestines, but also nourishes the intestines, and implicitly transforms the intestines, which in turn affects our choice and preference of food. At the same time, similar intestinal flora have similar metabolites, and these similar metabolites are absorbed by the intestine will naturally produce the same effect. As a result, couples gradually develop similar eating habits and tastes, and their body weight, aging status, skin texture changes, etc. also tend to be the same. This may be an important reason why couples look more and more alike. 3, intestinal flora affect human hormones Some scientists have confirmed that, because the human body similar intestinal flora, causing similar hormone metabolism, which led to the human body state (mental outlook and other external) similar, so “couples feel more like”. 4, intestinal flora affect the nerves Many studies have confirmed: intestinal flora will affect the synthesis of neurotransmitters, such as pentraxin. Some studies have found that probiotics more intestinal hosts, will be happier than the harmful bacteria. It is easy to think that people who have diarrhea every day must not be happy. But similar neurotransmitters or transmission patterns caused by similar intestinal flora (so that food is the basis) may also affect the outward expression of the body. We know that the number of bacteria in the human body is staggering, and the total weight of bacteria in a person weighing 100 pounds can reach 4 – 6 pounds. Therefore, a large number of various substances produced by the metabolism of microorganisms act on the human body at all times and have an impact on the physiopathological processes of the body. This role is far beyond people’s imagination, in addition to what we know, there are many more to be constantly explored and discovered. In this way we can deduce that the adoption of the regulation of the flora in the human body can solve many problems and many diseases faced by the human body. The micro-ecological balance system in the human body is like a complete biological chain, moving one link and affecting the whole picture. We can make the human body healthy by supplementing probiotics to keep the micro-ecological system in a balanced state.