Self-confidence, own security forces, opportunities, and satisfaction in life depend on genes to be held, according to a study of Italian and American psychologists. Optimism or pessimism, or in other words, if we see the glass half empty or half full, depend on the environment in which we grew up.
Self-esteem, life satisfaction and optimism have a common genetic basis. In optimism, however, environment plays a greater role than DNA. In the study doctors have observed 428 pairs of twins aged between 20 and 25 years.
It turned out that 73% of cases showed self-esteem is laid down genetically, as are 59 percent of life satisfaction and 28 percent of optimism.