Of the five main personality types—agreeableness, conscientiousness, extraversion, neuroticism, and openness—conscientiousness is the one that correlates most consistently with good health. Conscientious people are less likely than others to engage in harmful behaviors and more likely to adhere to healthful ones. In addition, conscientiousness may shape career choices, friendship, the stability of marriage, and many other aspects of life that affect health and, ultimately, longevity.
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