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When it comes to bugs like bacteria and parasites, we've been trained to think that less is better. But there are some good guys in the microbial world — bugs that do the unglamorous work of keeping us regular and helping to relieve a range of disorders from diarrhea to irritable bowel syndrome (IBS). Now, a new study suggests that the same microbes may even help us stay slim. 当谈到细菌和寄生虫的时候，我们习惯性的都认为越少越好。 实际上在微生物界中有一些好虫子的，它们做着枯燥无聊的工作来维持我们的身体正常运转，还能预防从腹泻到肠道紊乱综合症的病症。 现在新的研究发现这些微生物甚至帮助我们保持苗条。 In the Proceedings of the National Academy of Science, researchers at the University of Arizona and the Mayo Clinic in Arizona report a very small study of nine individuals — three of normal weight, three who were morbidly obese and three who underwent gastric bypass surgery. The team found that each group harbored a different intestinal zoo of microbes, and that following their surgery, the gastric bypass patients' gut bugs ended up looking much more similar to those of the normal weight patients. 在一项美国国家科学院亚利桑那州大学和马奥诊所的研究者们进行的小范围试验中，有9个被观测者，三个正常体重，三个肥胖症，还有三个要做胃旁路手术的病人。 研究团队发现不同组的人体肠道中的菌群是完全不同的。在手术后，那三个有胃病的人最后的肠道菌群变的和正常体重的病人相近了。 | 
