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　　Pass the bacteria, please!

　　Bacteria are terribly good for you. So say the promoters of a rapidly growing industry in “probiotic” products. The title “probiotic” (for life) is technically reserved for those food products containing living cultures of “good” microorganisms. Just how good are they? It depends on to whom you are listening.

　　“Microbic marketing” is highly competitive; many brands of yogurts, many yogurt drinks, and many capsules of live bacteria are on display—all promising to be good for you! Promotions are intense, and the questions are many. Do healthy people need cultures of bacteria when they already have a crowd of fine bacteria at work? How valid are the claims that probiotic products increase the health of intestinal cells, degrade toxins, or prevent cancer? There is yet no scientific consensus, and for now, consumers must decide for themselves.

　　The recent interest in probiotic products has grown out of a concern for the side effects of antibiotics in the 1950s. Since antibiotics are not very selective as to which bacteria they attack, those prescribed for a toothache can quickly wipe out a whole population of intestinal microbes. Bacteria contained in fermented-milk products appeared to be effective in restoring populations of the beneficial bacteria after such a catastrophe. In the development of probiotic products, different species of Lactobacilli and Bifidobacteria are selected according to their abilities to produce yogurt, to survive passage through the digestive tract, and to establish themselves in their new environment by out�瞔ompeting potentially unfriendly microbes for space and nutrients. This last criterion is not always easy to measure.

　　Cultures of yogurt, according to the National Yogurt Association, must contain at least 100 million live bacteria per gram. (Check to see how many bacteria are in one serving of your favorite yogurt.) It�餾 a big number, but it is impossible to know how many will loiter in your digestive system. Research now is underway to determine whether probiotic products might take the place of controversial antibiotics in livestock feed, or if bacterial/antibacterial compounds might be useful as food preservatives. Probiotics is about using bacteria to control other bacteria!

　　考研單詞：

　　reserve[riˈzə:v]

　　n.①儲備(物)，儲藏量，儲備金;②緘默，謹慎;v.①保留，儲備;②預定，預約

　　[真題例句] 58. The author�餾 attitude toward Richard Lamm’s remark is one of_________.[2003年閱讀4]

　　[B] reserved (v.①) consent

　　[例句精譯] 58�弊髡邔�理查德·拉姆所作評論的態度是________。

　　[B] 有保留的贊同

　　display[disˈplei]

　　v./n.陳列，展覽，顯示

　　[真題例句] While talking to you, your could-be employer is deciding whether your education, your experience, and other qualifications will pay him to employ you and your “wares” and abilities must be displayed(v.) in an orderly and reasonably connected manner.[1996年閱讀1]

　　[例句精譯] 在與你談話時，你未來的雇主將根據你的教育、你的經驗和你其他的資歷來確定雇用你是否值得，因此你必須把你的“品質”和能力以有序、合理且連貫的方式展示出來。

　　prescribe[priˈskraib]

　　v.①指示，規定;②處(方)，開(藥)