Menstruation can be contagious. In addition to menstruation, it can be contagious among girlfriends.

Bestivities get together to play, and "aunts" also come together to visit. I believe this kind of "menstrual synchronization" phenomenon is familiar to women. A study published by psychologist Mc Clintock in Nature in 1971 and an experiment conducted in the United States in the 1980s showed that "menstrual synchronization" is caused by a pheromone called pheromone. Some experts said that the reason why the period between girlfriends is contagious is most likely due to their similar pressures and emotions when they live and work together, coupled with their close contact with each other, they are easily affected by each other's hormones, making the menstrual period tend to be consistent.

Girlfriends get together all day long, and their living habits affect each other. It's not just the "big aunt" that infect each other. So apart from menstruation, what else are the infections between girlfriends?

1. obesity

As your best friend becomes fat, your chance of becoming fat increases by 57%

Obesity is also an "infectious disease". The New England Journal of Medicine published a 32-year study that showed that obesity is contagious in social circles, both biologically and behaviorally. Data shows that if a friend becomes fat, your chance of becoming fat increases by 57%. This phenomenon is the same as "those who are close to red are black, those who are close to ink are black". Most obese people like high-calorie foods, easily overeating, and do not like exercise much. People who interact closely with them are easily influenced, and these living habits tend to be obese, and their body shape slowly moves closer to obese people.

2. pregnant

When your best friend is pregnant, your chance of getting pregnant after two years increases by 20%

We will magically discover that when one of the sisters becomes pregnant, the other sisters will soon conceive a baby. Studies have shown that this is because pregnancy is "contagious". The American Sociological Association once published a study in which researchers studied 1700 American women. The results showed that if one person in a pair becomes pregnant, the other person is 20% more likely to become pregnant and have a child two years later.

3. depression

Co-ruminate and infect your best friend's depression

Lovelorn love, unemployment, illness... Every time we encounter setbacks in our lives, we will first think of confiding in our best friends. However, if you spit out these bitterness from you, you will feel better, but it may bring negative energy to your friends. Over time, it will cause you and your best friends to become depressed!

Researchers at the University of Missouri in the United States use the term "co-rumination" to describe the behavior of excessively addicted to and discussing the same issue. The behavior of "co-rumination" is potentially contagious. When you discuss something unhappy with your best friend, it is easy to spread one party's unhealthy emotions to the other. To avoid this "harmful infection", it is recommended to try to focus on solving the problem during discussion rather than just talking about it.

4. laughter

Your best friend's laughter will stimulate you to laugh.

Sometimes I obviously can't get a laugh, but I inexplicably laugh with my best friend. This is mainly because the appeal of my best friend's laughter is at work. The infectivity of laughter was confirmed in a study reported in the British journal Nature. The scientific explanation of "you laugh, and everyone laughs with you" means that laughter "tickles" the same area of the listener's brain. When a girlfriend smiles, an area of her brain becomes active, and her laughter stimulates this area of yours to become active as well, and the brain's response helps the muscles of your face show a heartfelt smile.

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