上一世纪末营养学家、临床医师和微生物学家们在如何看待人类大肠功能的观念上发生了根本的变化。以前大肠的主要功能仅被视为少量的吸收功能以及贮存和排泄废物。然而医学科学已意识到人体的大肠内生植着数量庞大、种类繁多的细菌群,并且相互之间又保持着平衡。这些有益菌群对于入侵的致病菌有抑制作用,因此他们在人类健康中扮演着极其重要的角色,更有人把它定义为人体的第四屏障。致病菌会导致胃肠道疾病如普通急、慢性胃肠炎,溃疡性结肠炎、伪膜性结肠炎。现在科学证实:结肠伴随的有益细菌能形成一个局部的菌群,有益细菌在结肠大 At the end of the last century, nutritionists, clinicians and microbiologists have undergone fundamental changes in their notion of how human colon functions. Previous major functions of the large intestine were only considered as small amounts of absorption as well as storing and excreting waste. However, medical science has realized that the body’s large intestine is home to a large and diverse group of bacteria that are in balance with each other. These beneficial flora inhibit the invasion of pathogens, so they play an extremely important role in human health, some people define it as the fourth barrier of the human body. Pathogens cause gastrointestinal disorders such as general urgency, chronic gastroenteritis, ulcerative colitis, pseudomembranous colitis. It is now scientifically proven: the colon accompanying beneficial bacteria can form a local flora, beneficial bacteria in the colon large