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
Cancer develops over a long time, which means that you have years——typically decades——in which to hinder or promote it. Research
Cancer develops over a long time, which means that you have years——typically decades——in which to hinder or promote it. Research
admin
2011-01-06
36
问题
Cancer develops over a long time, which means that you have years——typically decades——in which to hinder or promote it. Researchers are finding that what you eat may interfere with cancer growth at various stages. For example, certain foods can block the chemicals that initate cancer. Antioxidants(抗氧化剂), found in some vitamins and minerals, can snuff out oxygen free radicls (氧自由基), substances that are thought to make cells more susceptible to cancer, and they can even repair some of the cellular damage that has been done. And some food—wheat bran(麦,糠) in particular—has been shown to shrink precancerous(癌症前期的) cells.
A recent review of 17 studies from 17 nations reveals that people who eat the most fruits and vegetables have about half the cancer raters of those who eat the least. In fact, some research suggests that frequent consumption of fruits and vegetables can cut the risk of lung cancer even in smokers.
One of the most studied antioxidants in vegetables and fruits thought to protect against cancer is beta-carotene(β胡萝卜素), concentrated in deep green, yellow and orange vegetables such as carrots, sweet potatoes and spinach.
Research also shows that beta-carotene can change in the body to retinoic acid (维生素A酸), a substance used in clinical trials to treat certain cancers.
Here are some of the foods that contain cancer-fighting chemicals.
Tomatoes. One of the compounds in tomatoes that is thought to reduce the risk of cancer is lycopene(蕃茄素), the pigment (色素) that makes tomatoes red. Lycopene, an antioxidant that is also found in watermelons and apricots, quenches certain cancer-triggering oxygen free fadicals. Healthy people with the most blood lycopene.
Green Vegetables. A recent Italian study showed that dark-green leafy vegetables lower the risk of many cancer. Spinach, broccoli, kale and dark-green lettuces are chock-full of antioxidants, including beta-carotene, folate(叶酸) and lutein(叶黄素).A good rule of thumb(单凭经验的做法) : the darker the vegetable, the more antioxidants within.
Pungent preventives(刺激性的预防物). A whole host of chemicals thought to have cancer-inhibiting properties have been identified in allium vegetables, which include garlic, onions and scallions(大葱). Animal studies show that many of these chemicals block carcinogens that have been linked to colon, stomach, lung and liver cancer. A study at Pennsylvania State University found that feeding rats various garlic extracts and preparations(配制好的食物) reduced mammary tumors by as much as 71 percent. In humans, studies suggest that those who eat more onions and garlic are less prone to gastrointestinal cancer.
Research suggests that garlic compounds may even interfere with cancer progression. A recent German study found that ajoene, a garlic compound, is toxic to malignant cells. Garlic may also antagonize existing cancer by boosting(促进) immune functions, according to researchers at Loma Linda University School of Medicine. Their study, done on mice, found that garlic’s sulfur compounds increased the activity of macrophages and T-lymphocytes(淋巴细胞), two of the components of the immune system that destroy tumor ceils.
Although garlic compounds may reduce the risk of developing cancer, they have no effect on cancer that already exists.
选项
A、Right
B、Wrong
C、Not mentioned
答案
B
解析
见最后一段,“Research suggests that garlic compounds may even interfere with cancer progression…”研究提示,大蒜化合物甚至可能干扰癌的发展。最近的一项德国研究发现,一种大蒜化合物阿焦烯对恶性细胞有毒性。洛马·林达大学医学院的研究人员说,大蒜还可能通过提高免疫功能而对抗已出现的癌症。他们所做的老鼠实验发现,大蒜的硫化合物增强了免疫系统中两种消灭肿瘤细胞的成分——即巨噬细胞和T淋巴细胞——的活性。
转载请注明原文地址:https://kaotiyun.com/show/Izmd777K
本试题收录于:
职称英语卫生类B级题库职称英语分类
0
职称英语卫生类B级
职称英语
相关试题推荐
Therearevariouswaysinwhichindividualeconomicunitscaninteractwithoneanother.Threebasicwaysmaybedescribedasth
TheplaceisalovelymeadowsurroundedbydeepwoodsonahilltopoverlookingabeautifullakeintheCatskillMountains120mi
IntheUnitedStates,itisimportanttobepunctualforanappointment,aclass,ameeting,etc.Thismaynotbetrueinallco
Thebasicproblemofaneconomicsocietyistoallocateresourcesamongthemembersofthesocietysoastomaximizethewelfare
Thebasicproblemofaneconomicsocietyistoallocateresourcesamongthemembersofthesocietysoastomaximizethewelfare
Youwillhearfivepeoplegivingreasonswhychildrenlearntheirmothertonguesowell.Beforeyoulisten,readthelistof
MoniquehasbeeninLondonfor【L5】______days.MoniqueistakingtheEnglishcoursetoimproveher【L6】______Englishandtosee【L7
Lookatthetenstatementsforthispart.Youwillhearapassageabout"AResearchonSleep".Youwilllistentoittwice.
A.stayuptilltheearlyhoursofthemorningB.sleepenoughtobringmostrefreshmentC.rebuildmemoriesstoredduringthed
ANewfindingabouttheupperatmosphereBStratosphereCIonosphereDThecompositionofthepermanentgasesintheatmosph
随机试题
“六西格玛管理”理论是关于______的理论()
一只装有动力桨的船,其单靠人工划船顺流而下的速度是水速的3倍。现该船靠人工划动从A地顺流到达B地,原路返回时只开足动力桨行驶,用时比来时少。问:船在静水中开足动力桨行驶的速度是人工划船速度的多少倍?
关于三个方向的梯度场在磁共振空间定位中的作用,错误的是
硫脲类治疗甲状腺功能亢进的机制
A、兴奋β受体B、阻断M受体C、稳定肥大细胞膜D、抑制磷酸二酯酶E、选择性兴奋β2受体异丙阿托品扩张支气管的作用机制是( )。
唐长安城较为完整地体现了中国古代城市中最具影响力的典型格局,其特征中不包括()。
某高速公路M合同段,路面采用沥青混凝土,路线长19.2km。该路地处平原地区,路基横断面以填方3~6m高的路堤为主,借方量大,借方的含石量40%~60%。地表层以黏土为主,其中K7+200~K9+800段,地表层土厚7~8m,土的天然含水量为40%~52%
项目经理通过自己的人格、品质以及待人处事的方式给团队成员以影响,来推动工作的能力,这体现了项目经理的________。
公安机关的任务、目标决定了公安队伍必须保持政治坚定,站稳政治立场,把握正确方向。()
“现代”往往意味着对“传统”的突破甚至是反叛。百年中国,以变为主:从农业社会到工商社会、从礼俗社会到法理社会、从静止社会到流动社会、从闭关锁国到改革开放、从计划经济到市场经济等,一言以蔽之曰从传统社会到现代社会。很显然,一些传统的道德规范如愚忠愚孝、三从四
最新回复
(
0
)