首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
THE MAGIC OF EXERCISE Suppose there was a potion that could keep you strong and trim as you aged, while protecting your heart
THE MAGIC OF EXERCISE Suppose there was a potion that could keep you strong and trim as you aged, while protecting your heart
admin
2011-01-02
111
问题
THE MAGIC OF EXERCISE
Suppose there was a potion that could keep you strong and trim as you aged, while protecting your heart and bones; improving your mood, sleep and memory; warding off breast and colon cancer, and reducing your overall risk of dying prematurely. Studies have shown that exercise can have all those benefits —even for people who take it up late in life. Kin Narita and Gin Kanie, Japanese twins who are national longevity icons, celebrated their 105th birthday last week by planting trees and playing golf for the first time. Kanie suggested that activity might be a key to their long lives. "At this age I walk for two hours each morning for exercise," she said.
When Dr. Ralph Paffenbarger started tracking the health of 19,000 Harvard and University of Pennsylvania alumni back in the early 1960s, many experts thought vigorous exercise was downright dangerous for people over 50. But the Stanford epidemiologist turned that wisdom on its head. In a landmark 1986 study, Paffenbarger showed that the participants’ death rates fell in direct proportion to the number of calories they burned each week. Those burning 2,000 a week (roughly the number it takes to walk 20 miles) suffered only half the annual mortality of the couch potatoes, thanks mainly to a lower rate of heart disease.
Subsequent studies have shown that different activities bring different rewards. Everyone now agrees that aerobic exercise preserves the heart, lungs and brain, and researchers at Tufts University have recently shown that weight lifting can do as much for the frail elderly as it does for high school jocks. When Dr. Maria Fiatarone got 10 chronically ill nursing-home residents to lift weights three times a week for two months, the participants’ average walking speed nearly tripled, and their balance improved by half.
EATING TO NOURISH LONG LIFE
We all know that living on fat, salt and empty calories can have a range of nasty consequences, from obesity and impotence to hypertension and heart disease. Yet there are other ways to eat, and people who adopt them stay younger longer. In controlled studies, San Francisco cardiologist Dean Ornish has shown that a diet based on low-fat, nutrient-rich foods not only prevents heart disease —the Western world’s leading cause of early death —but can help reverse it. And other studies suggest that dietary changes could virtually eliminate the high blood pressure that places 50 million older Americans at high risk of stroke, heart attack and kidney failure.
You wouldn’t know that from watching people age in the United States. Hypertension afflicts a third of all Americans in their 50s, half of those in their 60s and more than two thirds of those over 70. But preindustrial people don’t follow that pattern. Whether they happen to live in China or Africa, Alaska or the Amazon, people in primitive settings experience no change in blood pressure as they age, and tile reason is fairly simple: they don’t eat processed foods. Dr. Paul Whelton of Tulane University’s School of Public Health has spent the past decade tracking 15,000 indigenous Yi people in southwestern China. As long as they eat a traditional diet —rice, a little meat and a lot of fresh fruits and vegetables-these rural farmers Virtually never develop hypertension. But when they migrate to nearby towns, their blood pressure starts to rise with age.
What makes processed food so harmful? Salt is one key suspect. When you subsist mainly on fresh plant foods —as our ancestors did for roughly 7 million years —you get 10 times more potassium than sodium. That 10-to-one ratio is, by Eaton’s reasoning, the one our bodies are designed for. But salt is now showered on foods at every stage of processing and preparation, while potassium leaches out. As a result, most of us now consume more salt than potassium. "Modern humans are the only mammals that do that," says Eaton, "and we’re the only ones that develop hypertension."
A recent clinical study suggests that dietary changes can reduce blood pressure as markedly as drug treatment, and can produce results in as little as two months. In the study, researchers at several institutions place volunteers on one of three diets. Those on a low-fat menu that included 10 daily servings of fresh fruits and vegetables, plus two servings of calcium-rich dairy products, reduced their systolic and diastolic readings by 5.5 mm and 3.0 mm, respectively. And those suffering from hypertension get reductions of twice that magnitude.
According to the passage, which of the following could be considered as a healthy diet?
选项
A、A diet that is sugar free but nutrient-rich.
B、A diet that is sodium free but vitamins-rich.
C、A diet that contains a lot of potassium and calcium.
D、A diet that consists of low-fat meat and fresh plants.
答案
D
解析
转载请注明原文地址:https://kaotiyun.com/show/4EeO777K
0
专业英语八级
相关试题推荐
Properarrangementofclassroomspaceisimportanttoencouraginginteraction.Mostofushavenoticedhowimportantphysicalse
Translatingisacomplexandfascinatingtask.Infact,A.Richardshasclaimedthatitisprobablythemostcomplextypeofeve
Itisalongtimeforalargeamountofbigcorporationsorinternationalcompaniestopaymuchattentiontoaneverimportants
A、$350,000B、$70,000C、$420,000D、$1.4millionC
PeterlooMassacrehappenedinthecityof_____.
Asignificantnumberofpeopleseektoadoptchildrenfromothercountries,aprocessknownasinternationaladoption.Peoplese
Moderatedrinkingreducesstrokerisk,studyconfirms.Similartothewayadrinkortwoadayprotectsagainstheartattacks,m
______,locatedatthesouthernendofLakeMichigan,isthesecondlargestcityinU.S.A.
历史的道路,不会是平坦的,有时走到艰难的境界。这是全靠雄健的精神才能够冲过去的。一条浩浩荡荡的长江大河,有时流到很宽阔的境界,平原无际,一泻万甲。有时流到很逼狭的境界,两岸从山迭岭,绝壁断崖,江河流于期间,回环曲折,极其险峻。民族生命的进展,其经历亦
随机试题
Graves病患者,甲巯咪唑维持治疗10个月,白细胞为2.5×109/L。其治疗宜
肛裂“三联征”是指
男性,30岁,由5米高处跌下2小时,腹痛来院,BP100/70mmHg,P120次/分,腹膜刺激征(+),血红蛋白90g/L,X线片示右膈肌升高。初步诊断是()。
在0.05mol/dm3的HCN中,若有0.010%的HCN电离了,则HCN的解离常数Ka为()
放款执行部门在办理授信业务发放过程中,主要审核的内容不包括()。
在贷款发放和支付过程中,借款人出现以下情形的,贷款人应与借款人协商补充贷款发放和支付条件,或根据合同约定停止贷款资金的发放和支付的有()。
“学而时习之”体现的教学原则是()
某木制品进出口公司因业务需要向外订购某种稀有木材,因市场信息不对称一直没有得到满意的回应。面对交货期一天天逼近,公司上下非常焦急。此时,本地另一木材公司上门提出愿出高于市场平均价3倍的价格出售相当数量的木材。进出口公司无奈之下只好同其签订合同。合同签订后,
《史记》将贾谊与合为一传。
DES算法的基本原理是每次取明文中的连续()位数据,通过相应的操作,最终得到转换后的相同位数密文。
最新回复
(
0
)