New research shows that drinking more than six 8-ounce cups of coffee does not increase your risk of developing colon cancer. 

研究顯示,大量的咖啡和汽水不會增加結腸癌風險。

 

May 6, 2010 -- Java junkies, rejoice: New research shows that drinking more than six 8-ounce cups of coffee per day does not increase your risk of developing colon cancer .

What’s more, drinking more than 18 ounces of sugary soda each day also does not appear to increase the risk of colon cancer , according to the new study that appears online in Journal of the National Cancer Institute.

“Coffee drinkers should be reassured that there is no increased risk of colon cancer and there is no reason to change their consumption,” says study researcher Xuehong Zhang, MD, ScD, an epidemiologist at the Harvard School of Public Health in Boston.

While sugary soft drink connoisseurs may not raise their risk of colon cancer, these “sweetened soft drinks are associated with weight gain , obesity , and type 2 diabetes for certain,” he tells WebMD. “Limiting your intake is recommended because of the risk of other health issues.”

 

Coffee, Soda, Tea and Cancer

 

Until now, the literature on how coffee and tea affect cancer risk has been mixed. Some studies have shown that drinking coffee and tea may lower the risk of cancer, but other studies have found that these beverages may increase the risk. For example, tea contains both cancer-fighting antioxidants and potentially cancer-promoting polyamines.

In the new study, researchers analyzed data from 13 studies totaling more than 731,441 participants. Of these, 5,604 developed colon cancer.

  • Those who drank more than six 8-ounce cups of coffee per day were no more likely to develop colon cancer than those who drank less coffee or no coffee.
  • The same held for those who drank more than 18 ounces of sugar-sweetened sodas each day, when compared to people who drank less soda or no soda.?
  • People who drank more than four 8-ounce cups of tea per day had a 28% greater risk of developing colon cancer than those who drank less tea or no tea.

Only 2% of the study population actually drank such high amounts of tea and soft drinks per day, which may have skewed the findings, the researchers point out.

The new study also had some other limitations; namely, that all of the populations studied were European, and the findings -- or the drinking habits -- may not apply to other populations. They researchers did not measure the health effects of adding milk or sugar to the coffee or tea, diet soda, or different types of tea, all of which could play a role in colon cancer risk.

 

Soda Health Risks Questioned

 

In an accompanying editorial, Cynthia Thomson, PhD, and Maria Elena Martinez, PhD, of the Arizona Cancer Center in Tucson, write that? “these results are particularly important given the substantial increase in sweetened beverage consumption that has occurred over the past 50 years worldwide.”

Still, they write, more study is needed to help elucidate the link between sugary sodas and cancer risk. “Contrary to coffee and tea consumption, intake of sweetened beverages begins in childhood in many countries,” they write. "Furthermore, sweetened beverage consumption is generally much lower among older adults. These differences in exposure suggest that intake of sweetened beverages may need to be assessed earlier in life to adequately assess its association with health outcomes.”

 

WebMD Health News 
by Denise Mann 
Reviewed By Laura Martin
Last Modified: 2010/5/7 下午 06:43:32
c 2010 WebMD, LLC. All rights reserved.

 

 

【24drs.com】May 6, 2010 -- 有咖啡癮的朋友們歡呼吧!最新研究顯示,每天喝超過6杯8盎司的咖啡並不會增加罹患結腸癌的風險。
  
  根據國家癌症研究院期刊(Journal of the National Cancer Institute)中的最新研究顯示,更重要的,每天喝超過18盎司的含糖汽水,也不會增加結腸癌的風險。
  
  波士頓的哈佛大學公共衛生學院流行病學專家Xuehong Zhang醫師表示,喝咖啡不會增加罹患結腸癌的風險,這些人應該可以放心,沒有理由改變他們的飲用量。
  
  他向WebMD表示,雖然喝含糖的清涼飲料不會增加罹患結腸癌的風險,但這些甜的清涼飲料肯定與體重增加、肥胖、以及第2型糖尿病有關。因為有其他健康問題,所以還是建議要限制攝取量。
  
  【咖啡、汽水、茶與癌症】
  直到現在為止,咖啡和茶如何影響癌症風險的文獻還沒有定論。有些研究顯示,喝咖啡和茶可以降低癌症風險,但有些研究發現,這些飲料可能會增加風險。例如,茶葉中含有抗癌的抗氧化物以及潛在致癌的聚胺。
  
  研究人員在最新研究中分析13個研究,總數超過731,441人。其中,有5,604人罹患結腸癌。
  * 相較於那些喝較少咖啡或沒有喝的人來說,每天喝超過6杯8盎司咖啡的人罹患結腸癌的風險並沒有比較高。
  * 每天喝超過18盎司含糖汽水的人,與那些喝較少汽水或沒有喝汽水的人相較之下,結果也是一樣。
  * 相較於那些喝較少茶或不喝茶的人來說,每天喝超過4杯8盎司茶的人罹患結腸癌的風險高了28%。
  
  研究人員指出,只有2%的研究對象是每天喝那麼大量的茶和飲料,這可能會使研究結果有偏差。
  
  這篇最新研究也有一些其他限制,也就是所有的研究對象都是歐洲人,這樣的研究結果,或是飲酒習慣可能不適用於其他族群。另外,研究人員並沒有測量在咖啡或茶、零卡可樂、或不同類型的茶添加牛奶或糖對健康的影響,這些全都可能與罹患結腸癌的風險有關。
  
  【汽水的健康風險受到質疑】
  位於土桑市的亞利桑那癌症中心Cynthia Thomson博士與Maria Elena Martinez博士於伴隨這篇研究的一篇評論中指出,這些結果特別重要,因為過去50年來,全球的含糖飲料攝取量顯著增加。
  
  不過,他們指出,需要有更多研究來協助說明含糖汽水與癌症風險之間的關聯。他們指出,相對於喝咖啡或茶來說,許多國家的孩子從幼兒時期就開始攝取含糖飲料。此外,老年人攝取的含糖飲料一般比較少。這些差異顯示,攝取含糖飲料可能需要在生活中早一點進行評估,以充分評估它與健康結果的關聯。

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