, a number of studies suggest that the various forms of insecure attachment can be associated with emotional rigidity, difficulty in social relationships, impairments in attention, difficulty in understanding the minds of others, and risk in the face of stressful situations.12
The latter is because the stress response is less healthy in those with insecure attachment. Stress response plays a role in our susceptibility to many mental and physical illnesses. The stress response is mediated by the hormone cortisol, and insecurely attached children are disadvantaged by having too much of it circulating. High levels of cortisol have been associated with depression, anxiety, suicidal tendencies, eating disorders, and alcoholism. Too much cortisol can damage parts of the brain responsible for retrieving information and thinking clearly.13 High cortisol is also believed to contribute to insomnia.