shVegetarians 'avoid more cancers'

shVegetarians 'avoid more cancers' 素食主义者可以避免很多癌症

Vegetarians² are generally less likely than meat eaters to develop cancer but this does not apply to all forms of the disease, a major study has found.

The study involving 60,000 people found those who followed a vegetarian¹ diet developed notably（显著的） fewer cancers of the blood, bladder（膀胱） and stomach.

But the apparently（显然，似乎） protective effect of vegetarian did not seem to stretch to bowel³ （肠）cancer, a major killer⁴.

The study is published in the British Journal of Cancer.

Researchers from universities in the UK and New Zealand followed 61,566 British men and women. They included meat-eaters, those who ate fish but not meat, and those who ate neither meat nor fish.

Overall, their results suggested that while in the general population about 33 people in 100 will develop cancer during their lifetime, for those who do not eat meat that risk is reduced to about 29 in 100.

Special protection?

The researchers said they found marked differences between meat-eaters and vegetarians in the propensity⁵ （倾向，习性）to cancers of the lymph（淋巴） and the blood, with vegetarians just over half as likely to develop these forms of the disease.

In the case of multiple myeloma（多发性骨髓瘤）, a relatively⁶ rare cancer of the bone marrow⁷（骨髓）, vegetarians were 75% less likely to develop the disease than meat-eaters.

The reduction was less notable for fish-eaters with these cancers. The reasons, researchers said, were unclear, but potential mechanisms⁸ could include viruses and mutation-causing compounds in meat - or alternatively that vegetables confer special protection.

There were also striking differences in rates of stomach cancer. Although the numbers of cases were small, fish-eaters and vegetarians were about a third as likely to develop the disease as meat-eaters.

Previous research has already implicated⁹ processed meats in stomach cancer, so these findings were not entirely¹⁰ surprising. It is thought N-nitroso compounds found in these meats may damage DNA¹¹, while the high temperatures they are cooked at may also produce carcinogens. （致癌物）

But the same reduction for vegetarians was not found with cancers of the bowel, one of the most common forms of the disease.

Meanwhile the relative risk for fish-eaters and vegetarians of cervical cancer （宫颈癌）was twice that of meat-eaters. The number of cases was small, and could be down to chance but the researchers said it was possible that dietary factors influenced the virus behind cervical cancer.

Professor Tim Key, the lead author, said it was impossible to draw strong conclusions from this one single study.

"At the moment these findings are not strong enough to ask for particularly large changes in the diets of people following an average balanced diet."

'Complex process'

A spokesperson for Cancer Research UK, which funded the research, said: "These interesting results add to the evidence that what we eat affects our chances of developing cancer. We know that eating a lot of red and processed meat increases the risk of stomach cancer.

"But the links between diet and cancer risk are complex and more research is needed to see how big a part diet plays and which specific dietary factors are most important.

Myeloma UK said this was the first data of its kind for the bone marrow cancer "and for that reason we are treating it with caution.

"Dietary advice to myeloma patients remains¹² aligned¹³ with national guidance - that they should eat a healthy, balanced diet high in fibre, fruit and vegetables and low in saturated¹⁴ fat, salt and red and processed meat."

Dr Panagiota Mitrou, Science and Research Programme Manager for the World Cancer Research Fund, said: "The suggestion that vegetarians might be at reduced risk of blood cancers is particularly interesting.

"However, this finding should be treated with caution since not much is known about the link between diet and these types of cancer. Further studies of vegetarians are needed before we can be confident this is actually the case." (本文由在线英语听力室整理编辑)

1 vegetarian   

n.素食者；adj.素食的

参考例句：

• She got used gradually to the vegetarian diet.她逐渐习惯吃素食。
• I didn't realize you were a vegetarian.我不知道你是个素食者。

2 vegetarians   

n.吃素的人( vegetarian的名词复数 )；素食者；素食主义者；食草动物

参考例句：

• Vegetarians are no longer dismissed as cranks. 素食者不再被视为有怪癖的人。
• Vegetarians believe that eating meat is bad karma. 素食者认为吃肉食是造恶业。

3 bowel   

n.肠(尤指人肠)；内部，深处

参考例句：

• Irritable bowel syndrome seems to affect more women than men.女性比男性更易患肠易激综合征。
• Have you had a bowel movement today?你今天有排便吗？

4 killer   

n.杀人者，杀人犯，杀手，屠杀者

参考例句：

• Heart attacks have become Britain's No.1 killer disease.心脏病已成为英国的头号致命疾病。
• The bulk of the evidence points to him as her killer.大量证据证明是他杀死她的。

5 propensity   

n.倾向；习性

参考例句：

• He has a propensity for drinking too much alcohol.他有酗酒的倾向。
• She hasn't reckoned on his propensity for violence.她不曾料到他有暴力倾向。

6 relatively   

adv.比较...地，相对地

参考例句：

• The rabbit is a relatively recent introduction in Australia.兔子是相对较新引入澳大利亚的物种。
• The operation was relatively painless.手术相对来说不痛。

7 marrow   

n.骨髓；精华；活力

参考例句：

• It was so cold that he felt frozen to the marrow. 天气太冷了，他感到寒冷刺骨。
• He was tired to the marrow of his bones.他真是累得筋疲力尽了。

8 mechanisms   

n.机械( mechanism的名词复数 )；机械装置；[生物学] 机制；机械作用

参考例句：

• The research will provide direct insight into molecular mechanisms. 这项研究将使人能够直接地了解分子的机理。 来自《简明英汉词典》
• He explained how the two mechanisms worked. 他解释这两台机械装置是如何工作的。 来自《简明英汉词典》

9 implicated   

adj.密切关联的；牵涉其中的

参考例句：

• These groups are very strongly implicated in the violence. 这些组织与这起暴力事件有着极大的关联。 来自《简明英汉词典》
• Having the stolen goods in his possession implicated him in the robbery. 因藏有赃物使他涉有偷盗的嫌疑。 来自《现代汉英综合大词典》

10 entirely   

ad.全部地，完整地；完全地，彻底地

参考例句：

• The fire was entirely caused by their neglect of duty. 那场火灾完全是由于他们失职而引起的。
• His life was entirely given up to the educational work. 他的一生统统献给了教育工作。

11 DNA   

(缩)deoxyribonucleic acid 脱氧核糖核酸

参考例句：

• DNA is stored in the nucleus of a cell.脱氧核糖核酸储存于细胞的细胞核里。
• Gene mutations are alterations in the DNA code.基因突变是指DNA密码的改变。

12 remains   

n.剩余物，残留物；遗体，遗迹

参考例句：

• He ate the remains of food hungrily.他狼吞虎咽地吃剩余的食物。
• The remains of the meal were fed to the dog.残羹剩饭喂狗了。

13 aligned   

adj.对齐的，均衡的

参考例句：

• Make sure the shelf is aligned with the top of the cupboard.务必使搁架与橱柜顶端对齐。

14 saturated   

a.饱和的，充满的

参考例句：

• The continuous rain had saturated the soil. 连绵不断的雨把土地淋了个透。
• a saturated solution of sodium chloride 氯化钠饱和溶液