A recent US study found that people who score high for extroversion rate themselves as leaner and taller than they acmally are,with male extroverts weighing more than introverts.Conscientiousness is associated with a healthier weight,xvith the most conscientious（in the top 25%）weighing on average almost Skg less than the least conscientious（in the bottom 25%）.Participants scoring low on emotional stability tended to overestimate their weight,although women who gave themselves a low score did actually weigh more than others with higher scores on this trait.These findings held across all of the ethnic groups included in the study.While some links are unsurprising（eg.conscientious people stick to their diets）,some are not so easy to explain.Why,for example,do extrovcrted men weigh more?Is it because they're always in the pub?If so,perhaps the"beer goggle"effect explains why they rate themselves as taller and thinner than they actually are.