Its very presence helps to prevent other organisms ...

Bacteria of the gastrointestinal tract depends on what part of the gastrointestinal tract of which you speak. Actual stomach and small intestine are very few bacteria in relation to pH field. The colon has a large number of anaerobic organisms. Ileum has a large number of aerobic and anaerobic organisms. How useful each of them depends on what happens to them. In normal circumstances, the mere presence of numerous bacteria in our digestive tract is useful because competition for space / nutrients leads any one type of bacteria in the production and makes us sick (for example, what happens when someone suffers from Clostridium difficile after admission antibiotics that kill other bacteria in our intestines). In general, bacteria with our GI tract to prevent over production of one body over another, digesting the food we eat, the changes that we eat into nutrients, we can use and maintenance of normal intestinal homeostasis. Here are some examples:

E. coli can be very bad for us, but it is also very useful when it is kept at a level that it does not make us sick. It helps in the production of vitamin K. Vitamin K plays an important role in our clotting mechanisms and bone health. Bifidobacterium help control intestinal homeostasis, some of vitamins, bioconversion of food compounds and occupy space and suggests that competition to prevent other organisms with more than production. Enterococcus faecal is possible and probiotic ferments glucose without gas, but strattera cost can lead to very bad infection if given the opportunity to produce more. Its very presence helps to prevent other organisms from over production as well. Lactobacillus (as mentioned) to help with translation of lactose and other sugars to lactic acid. With the production of lactic acid, they make area more acidic, which inhibits the production of other organisms that can grow in acidic medium. It may also have anti-inflammatory and anticancer properties (this is still being studied). .