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Why Women Live Longer Than Men -- Edward Donick
If you could take an immense group snapshot of everyone in the United States today, it would contain six million more females than males. In this country, women outlast1 men by about seven years. Throughout the modern world, cultures are different, diets are different, ways of life and causes of death are different, but one thing is the same -- women outlive men.
It starts before birth. At conception, male fetuses2 outnumber female by about 110 to 100; at birth the ratio has already fallen to about 105 boys to every 100 girls. By age 30, there are only enough men left to match the number of women. Then women start building a lead. Beyond age 80, there are nearly twice as many women as men.
"If you lookat the top ten or 12 causes of death," says Deborah Wingard, an epidemiologist at the University of California at San Diego, "every single one kills more men." She rattles3 off one melancholy4 fate after another - heart disease, lung cancer, homicide, cirrhosis of the liver and pneumonia5. Each kills men at roughly twice the rate it does women.
A century ago American men outnumbered and outlived the women. But in the 20th century,women began living longer, primarily because pregnancy6 and children had become less dangerous. The gap grew steadily7. In 1946, for the first time ever in the United States, females outnumbered males.
Part of the reason are self-inflicted. Men smoke more than women, drink more and take more life-threatening chances. Men are murdered (usually by other men) three times as often as women are.They commit suicide at a higher rate and have more than twice as many fatal car accidents as women do. Men are likely to be involved in alcohol-related fatalities8. Men drivers!
But behavior doesn't explain away the longevity9 gap. Nor is stress the answer. In the 1950s, as heart disease claimed more and more male victims, pressure in the corporate10 boardroom was blamed. Let women venture out of the home and into the line of fire, doctors said, and they would begin duingat the same rate as men. But a funny thing happened on the way to the funeral. Between 1950 and 1985, the percentage of employed women in the United Stated nearly doubled. Those working women, several studies have found, are as healthy as women a home.
Today, some scientists studying the gender11 gap believe that the data point to one conclusion: Mother Nature may be partial to women.
Every living thing is assembled according to instructions on its chromosomes13, and humans have 23 pair of them. But in males, one of these is a vulnerable non- matching pair, denoted by "xy".The corresponding pair in females is "xx", and its genetic16 "backup" power is sometimes cited as a clue to woman's superior resilience. If the male's single "x" chromosome12 is defective17, it is possible for a serious genetic disorder18 to appear. Hemophilia and certain types of muscular dystrophy, for instance, are diseases caused by a defect in a single gene15 on the "x" chromosome,They are far more common in males than females.
The single "x"theory has problems, though. There just aren't enough cases of the most feared genetic diseases to account for more than a tiny bit of the longevity gap between men and women. And some researchers pin the blame directly on the male "y" chromosome.
The answer may rather be hormones20. Before age 40, when virtually all women are still producing estrogen, heart disease kills three men for every woman. But from that point onward21, the odds22 in favor of women drop steadily. For both sexes, heart disease is the leading cause of death. But women have an extra decade before their mortality rate for heart disease approaches that of men.
If estrogen is the heroine of story, testosterone, the male sex hormone19, may be the villain23. Until puberty, boys and girls have the same cholesterol24 levels. But when boys and girls have the same cholesterol levels. But when boys hit adolescence25 and testosterone kicks in, their level of HDL cholesterol, "good cholesterol,"plunges. In girls, HDL levels hold steady. In both sexes, LDL, "bad cholesterol" levels rise in late adolescence. But the increase is somewhat steeper in men.
Not every difference between the sexes favors women. On average, men are taller than women and have heavier bones and bigger muscles. Men will die sooner, but we'll have hit more home runs by the time we go.
While women turn out to be less vulnerable than men to life-threatening diseases, they are more vulnerable to everyday sicknesses and pain. In 1676 one diarist noted14, "I have heard physicians say they have two women patients to one man." Women still make more visit to the doctor than men do, take more prescription26 and non-prescription drugs and spend more days in bed. They are plagued by arthritis27, bunions, bladder, infections, corns, hemorrhoids, menstrual woes28, migraines and varicose veins29.
In the meantime, men get heart attacks and strokes. Women are sick, but men are dead.
Mental health? Depression is more common in women than in men. But schizophrenia, perhaps the most devastating30 mental illness, often affects men more severely31.
After a spouse32 dies, men seem to fare worse than women. They are more depressed33, more likely to fall ill and more likely to die. As a result, nearly 80 per cent of the population over 65 years old and living along are women. Men fare poorly, it seems, because in many cases their wives were their sole confidantes. Without a spouse, new widowers34 fall and sink. Women who lose a husband, in contrast, often have a circle of close friends to confide35 in and count on.
But behavior changes, so the health gap between men and women isn't a fixed36 feature of the landscape. In recent decades, the gap between men and woman's life-spans has narrowed from 7.6 years in 1970 to an estimated 6.8 years in 1990. The explanation is not that women's health is deterioration37. Women's health is improving, but men's is improving faster.
Men are smoking less, drinking less and eating better. "The gap isn't shrinking because women are acting38 like men," says epidemiologist Wingard. "It's shrinking because men are behaving more like women."
1 outlast | |
v.较…耐久 | |
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2 fetuses | |
n.胎,胎儿( fetus的名词复数 ) | |
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3 rattles | |
(使)发出格格的响声, (使)作嘎嘎声( rattle的第三人称单数 ); 喋喋不休地说话; 迅速而嘎嘎作响地移动,堕下或走动; 使紧张,使恐惧 | |
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4 melancholy | |
n.忧郁,愁思;adj.令人感伤(沮丧)的,忧郁的 | |
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5 pneumonia | |
n.肺炎 | |
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6 pregnancy | |
n.怀孕,怀孕期 | |
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7 steadily | |
adv.稳定地;不变地;持续地 | |
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8 fatalities | |
n.恶性事故( fatality的名词复数 );死亡;致命性;命运 | |
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9 longevity | |
n.长命;长寿 | |
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10 corporate | |
adj.共同的,全体的;公司的,企业的 | |
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11 gender | |
n.(生理上的)性,(名词、代词等的)性 | |
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12 chromosome | |
n.染色体 | |
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13 chromosomes | |
n.染色体( chromosome的名词复数 ) | |
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14 noted | |
adj.著名的,知名的 | |
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15 gene | |
n.遗传因子,基因 | |
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16 genetic | |
adj.遗传的,遗传学的 | |
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17 defective | |
adj.有毛病的,有问题的,有瑕疵的 | |
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18 disorder | |
n.紊乱,混乱;骚动,骚乱;疾病,失调 | |
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19 hormone | |
n.荷尔蒙,激素,内分泌 | |
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20 hormones | |
n. 荷尔蒙,激素 名词hormone的复数形式 | |
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21 onward | |
adj.向前的,前进的;adv.向前,前进,在先 | |
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22 odds | |
n.让步,机率,可能性,比率;胜败优劣之别 | |
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23 villain | |
n.反派演员,反面人物;恶棍;问题的起因 | |
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24 cholesterol | |
n.(U)胆固醇 | |
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25 adolescence | |
n.青春期,青少年 | |
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26 prescription | |
n.处方,开药;指示,规定 | |
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27 arthritis | |
n.关节炎 | |
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28 woes | |
困境( woe的名词复数 ); 悲伤; 我好苦哇; 某人就要倒霉 | |
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29 veins | |
n.纹理;矿脉( vein的名词复数 );静脉;叶脉;纹理 | |
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30 devastating | |
adj.毁灭性的,令人震惊的,强有力的 | |
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31 severely | |
adv.严格地;严厉地;非常恶劣地 | |
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32 spouse | |
n.配偶(指夫或妻) | |
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33 depressed | |
adj.沮丧的,抑郁的,不景气的,萧条的 | |
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34 widowers | |
n.鳏夫( widower的名词复数 ) | |
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35 confide | |
v.向某人吐露秘密 | |
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36 fixed | |
adj.固定的,不变的,准备好的;(计算机)固定的 | |
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37 deterioration | |
n.退化;恶化;变坏 | |
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38 acting | |
n.演戏,行为,假装;adj.代理的,临时的,演出用的 | |
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