1, eating habits.

If you have the same eating habits as another person, then this can be the reason why you look more alike. If two people who become partners love to eat foods with high fat content, then their faces may both look chubby. The researchers ruled out the influence of this factor in the study.

2. Environment.

Married couples generally live together, which means that environmental factors such as sunlight will also affect the skin, and the longer the husband and wife look alike. Researchers have also done a consistent treatment. In this study, all couples who provided photos came from the Midwest of the United States and matched their socio-economic variables.

3. Choice tendency.

This means that people are more inclined to choose people who are similar to themselves as partners. For example, people with depressive characteristics are more likely to attract each other, so that they show depressive characteristics on their faces over time. Researchers are not very interested in this, so this is not strictly controlled in the study.

4. empathy.

This is what researchers want to explore through research. The reason why people look more alike is because the two people who become partners have the same spiritual connection. Empathy makes two people imitate each other's facial expressions, and mutual imitation caused by long-term empathy makes partners have more facial similarities.

For example, if one person smiles in a special way, the other person will unconsciously imitate it, and similar wrinkles and muscle lines will appear when laughing.