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
39
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] According to the following passage, which of the following statements is true of international comparisons of overall fat intake?
选项
A、They provide a reasonable indicator of the health benefits of polyunsaturated fats.
B、They tend to conflate too many factors to provide an effective argument against reducing overall fat intake.
C、They are rife with subtleties too complex for most nutritionists to be able to understand properly.
D、They correctly tend to indicate the necessity for reducing overall fat intake reduction in affluent societies.
E、They tend to lend too much attention to non-dietary causes of coronary heart disease.
答案
B
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3353386.html
相关试题推荐
I______theinstantcoffeeifit’sallyou’vegot.A、don’tobjecttohavingB、do
Havingfinishedtheletter,he______itcarefullyandsealedtheenvelopwitha
Havingbeenfoundguilty,themanwasgivenasevere______bythejudge.A、service
_______toomuchtodo,theyhavetokeepthemselvesbusyalldaylong.A、Having
Havingfinishedtheletter,he______itcarefullyandsealedtheenvelopwitha
Duringthelastthreedecadesthenumberofpeopleparticipatinginphysicalfit
________,Henrywashedthecupandputitaway.A、HavingdrinkingthecoffeeB、Dr
Forthepastseveraldecades,itseemsthere’sbeenageneralconsensusonh
Afriendofmine,inresponsetoaconversationwewerehavingabouttheinj
Afriendofmine,inresponsetoaconversationwewerehavingabouttheinj
随机试题
TheJapanesehavedecidedtoimposeincrediblyhightariffonagriculturalimpor
WaltandhisbrotherRoyworkedtogether______.[br]WhatcanwelearnaboutWi
[originaltext]W:Interestedinthisbook?Thisisourbestsellerthisweek.M:
土料的渗透系数测定法主要包括( )。 A、经验法 B、野外测定法 C
房地产估价作为估价行业主体的原因包括()。A.国家法律规定 B.房地产是
因果图方法的显著特点是包括两个活动,它们是()。 A.分析各种假设条件B.找
甲卖给乙一台农用车。合同达成后,甲向乙表示需将农用车留用几日以完成拉货。则乙取得
证券组合的收益率等于各单个证券的收益率的移动平均。()
甲公司为增值税一般纳税人,2020年6月有关经营业务如下: (1)销售一批冰箱
下列情况中,需要到供电部门办理用电手续的是( )。A.增加用电容量 B.变更
最新回复
(
0
)