A well known fact the negative impact of bullying on health has been confirmed by studies Isabel Ulla-Moraines from the Centre for stress research, functioning in the Hospital Louis Lafontaine. Their result showed that many people are mistaken in the belief that the structure of the genes is not affected by the changes. So it was clearly established that negative emotions are caused by bullying, lead to changes in the expression of genes. This factor has a direct impact on the level of the person's mood and psychological state.
Previously, similar studies on twins have shown that the test of a stressful situation led to the production of cortisol, a stress hormone, the concentration of which in the body directly affects the level of problems arising from social contacts. If one of the twins becomes a target for bullying, it blunted stress response that leads to decreased production of cortisol and increase social adaptive problems.
The results showed the influence of stress on regulatory functions of the body to produce serotonin, which is responsible for the risk of developing depression and directly affect mood. I participated in a study of twins showed no differences in the functioning of the organism under 5 years, since they were not exposed to the negative feelings caused by bullying. However, by 10 years at one of the twins, which was largely affected by the negative attacks from others, revealed abnormalities in the function of the secretion of serotonin.
Now scientists have to prove or disprove the hypothesis derived from the obtained results, namely, that such changes are at the root of aggressive behavior of young people aged 18 - 25 years.