We don’t yet know for sure, but it’s increasingly accepted that our early life experiences play a key role in forming our personalities. Genetics also plays a big part as, according to scientists at the US National Cancer Insititute, most human traits are linked to genes.
For instance, neurotic behaviour is associated with the gene that controls the amount of serotonin released in our bodies. Serotonin – often dubbed ‘nature’s Prozac’ is a brain chemical that contributes to our moods and if we have low levels we are more likely to suffer from depression, anxiety and obsessive compulsive disorders.
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