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Gut bacteria: we are what we eat

[ 2011-09-28 12:49]     字號 [] [] []  
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Gut bacteria: we are what we eat

This is the VOA Special English Health Report.

The human digestive system is full of bacteria -- mostly good bacteria. These organisms help break down food so the body can use the nutrients. Scientists are exploring the link between what kinds of bacteria live in our gut and what kinds of food we eat.

Gary Wu from the University of Pennsylvania and other scientists did two studies. Mr Wu says the studies looked for connections between the food that people ate and the kind ofmicrobes living in their intestines.

GARY WU: "We collected stool samples to look at the types of bacteria in the gut of people who provided us information about what they ate."

He says people with one kind of diet had very different bacteria than people who ate a different diet.

GARY WU: "So, we found essentially that there are two major categories in which individuals could be classified by the bacteria in their gut: one associated with sort of a western-type diet, and another one associated with a more agrarian or fruit-vegetable type of diet."

In the second study, 10 volunteers took part in a so-called controlled feeding experiment. They had to change their normal diet. Yet their digestive bacteria remained much the same. This suggests that the mix of bacteria is based on long-term dietary patterns, not what people ate in recent days.

Gary Wu thinks testing people's mix of intestinal bacteria might be a better way to measure their disease risk than asking about their diet. He says intestinal bacteria might even play a part in the development of disease. If so, this could lead scientists to new ways to help prevent diseases.

GARY WU: "It means that if you could switch the types of bacteria in your gut, perhaps you could influence the development of certain types of diseases -- perhaps the types of diseases associated with western or more industrialized nations. That's a little bit more speculative, but that's something that is certainly very much of interest in the field."

The two studies are in the journal Science. The research may add to understanding of how diet affects health.

Another recent study involving diet warned that obesity is increasing worldwide, but especially in the United States and Britain. The findings appeared in the Lancet medical journal.

Worldwide, experts say one and a half billion adults are overweight. Another half-billion are obese. At current rates, about half of all American adults could be obese by 2030. In Britain, obesity rates could reach 48 percent for men and 43 percent for women.

Experts say the rise in obesity is likely to lead to an increase in cases of diabetes, heart disease, cancer and other conditions.

Obesity is also on the rise among children.

And that's the VOA Special English Health Report. I'm Steve Ember.

bacteria: a very large group of microorganisms comprising one of the three domains of living organisms 細菌

gut: the lower part of the alimentary canal; intestine 內臟;腸子

microbe: a minute life form; a microorganism, especially a bacterium that causes disease 細菌,微生物

intestines: internal organs 內臟

agrarian: relating to or concerning the land and its ownership, cultivation, and tenure 土地的;耕地的

obesity: the condition of being obese; increased body weight caused by excessive accumulation of fat 肥胖癥

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超強防腐劑助食物長久保鮮

Obese people aren't necessarily unhealthy

No need to go to extremes to lose weight

(來源:VOA 編輯:張若瓊)

 
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