金发和碧眼也许看起来是最美妙的结合,但是它们也和特定的医疗条件下增加的发病率有关。在一项研究中,50个有学习障碍的孩子中,20%的是金发。相反,在没有学习障碍的孩子中仅仅有11%的是金发。金发和碧眼的组合在苯丙酮酸尿症患者中是常见的,这些患者体内的苯基丙氨酸积累过多。Behan等人(1985)认为大部分金发碧眼的人有诵读困难症(他们很多是左撇子)。另一项研究显示,金发研究专家认为学习障碍症的发病率在金发碧眼的人中有轻微的增长。众所周知,黑色素在神经回路的发展中起着重要作用,一些金发的人由于缺少黑色素,会对某些特定条件更加抗拒。
4.Baldness Is Linked To Heart Disease
4.头顶脱发和心脏病有关
The loss of hair, whether as a result of a medical condition or aging, is often a great source ofconcern. It is usually males who go bald, while women almost always keep their hair, a factrelated to testosterone levels. Baldness might seem cosmetic, but a recent medical study of40,000 men has linked balding to a much greater risk of coronary heart disease. The risk ofheart disease in men with male pattern baldness was found to be 70 percent greater than innon-balding males. Different levels of baldness carried differing risk levels, from 18 percent atmild to 48 percent for serious balding. The correlation between top of the head baldness andheart disease is believed to relate to multiple factors, potentially including insulin andhormone-related variables. Interestingly, a receding hairline and hair-loss away from the topof the head was not associated with heart disease.
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