a person can show notable increases or decreases in levels of certain personality traits. What causes a change in personality? Created with Sketch. Many factors may lead to changes in personality.

For example, people who are less conscientious are more ... Where does this leave us with whether we can change? The truth is that siblings generally have a fairly similar environment.

Our gut bacteria are unique to us – it is almost like a ‘fingerprint’ of a person – but, crucially, they can change. Firstly, every person reacts differently to different foods.

Despite its day-to-day stability, personality can change in the long term, potentially to a substantial degree over the course of a person’s life. Research suggests that people tend to show ...