拜瑟医生怀疑，每个人吸收营养、存储脂肪的能力和自己的肠道菌群的种类组合息息相关。胖子们的似乎在肠道内饲养了一群会提高脂肪存储的微生物才造成了他们的肥胖。而那些胃旁路患者也走了相同的路，不过方向刚好相反，吃的少，也就养成了适合节食的菌群。对于运动和减少食物摄入如何影响这种变化和这些减肥效果能减肥的新菌群能坚持多久还不是很清楚。

But none of this means that downing the latest probiotic yogurts, which contain certain strains of good gut bacteria, should be the next weight loss craze. For one, says DiBaise, the strains that were dominant in the normal weight people are not the same as those promoted in the popular probiotic yogurts. Second, there is no evidence that probiotic products can do anything about weight loss; the latest scientific studies have shown only that probiotics can relieve antibiotic-related diarrhea, as well as alleviating IBS and aiding regularity. "It is interesting to look at microbial flora, " says Lynne McFarland, an epidemiologist at the Puget Sound Veterans Administration Medical Center, who was not affiliated with the study. "But I would not run out and eat a lot of yogurt because of this."

但是这些结果不意味着喝含有一些良性菌的最新酸牛乳会成为下一个减肥风潮。拜瑟医生说，首先，人体肠道中的菌群和算牛乳的菌群是不一样的。其次，这些产品和能不能减肥基本没啥关系。最新的研究也只是发现这些饮料可以缓解抗生素相关的腹泻，减轻肠道综合症和稳定肠道。没有参与本研究的皮热老兵健康管理医疗中心的流行病学家林恩.马克弗兰说：“观察微生物菌从是很有意思的，那我也不能因此跑出去吃一大堆酸乳酪啊！”

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