首页
登录
职称英语
Many nutritionists, having known for decades that saturated fat, fou
Many nutritionists, having known for decades that saturated fat, fou
游客
2024-01-11
20
管理
问题
Many nutritionists, having known for decades that saturated fat, found in
abundance in red meat and dairy products, raises blood cholesterol levels that
are in turn associated with a high risk of coronary heart disease, have fallen
Line victim to the temptation of simplifying dietary recommendations to facilitate
(5) public nutrition education. After decades of promoting the consumption of all
complex carbohydrates and eschewing all fats and oils, much of this theory has
been discredited.
Controlled feeding studies in which the participants eat carefully prescribed
diets for several weeks substantiated that saturated fat increases cholesterol
(10) levels, and that polyunsaturated fat-found in vegetable oils and fish-reduces
cholesterol. Dietary advice should therefore emphasize the replacement of
saturated fat with polyunsaturated fat, not total fat reduction. The subsequent
doubling of polyunsaturated fat consumption that this advice might inspire could
potentially contribute to a halving of coronary heart disease rates.
(15) Indeed, the argument that fat in general is to be avoided has been hastily
extrapolated from observations that affluent Western countries have both high intakes
of fat and high rates of coronary heart disease. This correlation is limited to saturated
fat, however, for societies in which people eat relatively large portions of
monounsaturated and polyunsaturated fat (whose health benefits are nearly identical)
(20) tend to have lower rates of heart disease. On the Greek island of Crete, for
instance, where the traditional diet contained much olive oil, a rich source of
monounsaturated fat, and fish, a source of polyunsaturated fat, fat constituted
40 percent of the calories in this diet, but the rate of heart disease was lower
than the rate for those who followed the traditional diets of Japan, where fat
(25) composes only 8 to 10 percent of the calories. Furthermore, international
comparisons of overall fat intake can be misleading: many negative influences
on health, such as smoking, physical inactivity and high amounts of body fat,
are also correlated with Western affluence. Many nutritionists decided it would
be too difficult to educate the public about these subtleties, instead advocating a
(30) clear, simple message that fat was insalubrious.
The wisdom of this practice has further come into question as researchers
discover that the two main cholesterol-carrying chemicals, low-density
lipoprotein (LDL), and high-density lipoprotein (HDL), have very different
effects on the risk of coronary heart disease, such that increasing the ratio of
(35) LDL to HDL in the blood raises the risk, whereas decreasing the ratio has the
opposite effect. Unfortunately, certain controlled feeding studies have shown
that when a person replaces calories from saturated fat with an equal amount of
calories from carbohydrate-rich polyunsaturated fats, not only the levels of LDL
and total cholesterol diminish, but also the level of HDL, and thus in only a
(40) limited reduction in risk accrues from shifting to a polyunsaturated fat diet. [br] If the hypothesis stated in lines 36 - 40 is true, it can be inferred that nutritional theory should argue that the consumption of more polyunsaturated fats
选项
A、necessitates the consumption of higher levels of carbohydrates
B、is unlikely to affect the ratio of LDL to HDL levels in the bloodstream
C、is likely to have no observable effect on the risk of coronary heart disease
D、is potentially capable of wholly eliminating cholesterol levels in the blood
E、is poorly understood in light of the failure of certain controlled feeding studies
答案
B
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3353389.html
相关试题推荐
LARGE:GARGANTUAN::A、drenched:humidB、moist:saturatedC、critical:detrime
Manynutritionists,havingknownfordecadesthatsaturatedfat,fou
Manynutritionists,havingknownfordecadesthatsaturatedfat,fou
Manynutritionists,havingknownfordecadesthatsaturatedfat,fou
Manynutritionists,havingknownfordecadesthatsaturatedfat,fou
Howanyfetussurvivesgestationhasbaffledscientistsfordecades:theembryo’
BenjaminFranklinwasrenownedforbeinga______,havingdelveddeeplyintofiel
FarminghadbeenprofitableontheGreatPlainsformanydecades,butby1938(i
Edgar’s______athavingbungledthesimpleassignmentwasclearfrom|histremblin
PatriciaRobertsHarrisisconsidereda______,havingbeenthefirstAfricanAme
随机试题
Manypeopleprefertohavetheirtaxformscompletedbyaprofessionalratherth
PaulieTheatreNameoftheshow:DanceoftheSoulDate:19:30,March2
在变配电所的设计中,下面哪一条的规定是正确的?()A.高压配电室宜设能开启的
男,12岁,自幼喉结下有蚕豆大小的结节,近来结节增大至2.0cm,随伸舌可以上提
关于人类胚胎干细胞研究的伦理原则不正确的是()A.尊重原则 B.知情
A.蒲公英B.锁阳C.鱼腥草D.半枝莲E.泽兰叶互生,呈心形,全缘,表面密生腺点
患者男,23岁。出现发热,恶心呕吐,颈项强直的症状。脑脊液涂片见到革兰阴性双球菌
既能降气化痰,又能疏散风热的药物是( )。A.旋覆花 B.白前 C.前胡
下列关于贷款发放管理中,说法不正确的是()。A.在满足借款合同用款前提条件的情
什么情况下,动机对学习具有最大程度的促进作用?() A.动机强度较高B.动
最新回复
(
0
)