It has been estimated that about 400 species of bacteria inhabit our digestive. Some of these bacteria are called beneficial bacteria, while others less desirable are producing bacteria diseases, which often invade certain parts of our body and cause diseases. probiotics are live microorganisms that, eaten in quantity, can provide beneficial effects on the organism. Most of these micro-organisms are known as Lactobacilli and Bifidobacteria and found primarily in fermented dairy products (yoghurt, cheese) and nutritional supplements. The beneficial bacteria produce lactic, acetic and formic acids, and lower the pH of the intestine, inhibiting Thus the growth of harmful bacteria. Our level of health largely depends on the conditions of the beneficial bacteria and control that they are able to exercise over the harmful. Some of the beneficial bacteria can grow only in environments that lack almost entirely of oxygen as the Bifidobacteria.

Others require small amounts of oxygen to live and grow and are therefore called microaerofilos organisms, (such as Lactobacillus acidophilus), although some strains are able to survive in the absence of oxygen. It must be borne in mind that not all Lactobacilli or Bifidobacteria can be considered probiotics, since to do so it is necessary to have demonstrated a beneficial effect on the organism different from the purely nutritional. A typical probiotic product is yogurt. Beneficial bacteria have the potential to play two roles. (a) improve the nutritional absorption of nutrients markedly helping us digest food and producing essential vitamins. (b) they play specific therapeutic roles important. Due to these multiple and complementary benefits of beneficial bacteria is so it has coined the term probiotics. Refer to that support and intensify life: ours and the of them; In contrast to the activity of anti-life of antibiotics which kill bacteria, both beneficial and harmful, indiscriminately when they are supplied.