Are there many bacteria on the human body?

There are different kinds and quantities of bacteria on different people's skin. There are about one trillion bacteria living on a person's skin on average, and there are many kinds. In one study, researchers detected 182 kinds of bacteria from the arms of six people. Most of these bacteria are staphylococci, streptococci and coryneform bacteria, which decompose the originally tasteless sweat into odorous organic substances, thus emitting a body odor. The species and quantity of bacteria living on everyone's skin are relatively fixed in a lifetime. No matter how much you talk about hygiene and how often you take a bath, this situation will not change. We shed about10 million pieces of dead skin every day, of which about 10% contains live bacteria. Everyone is a seeder of bacteria, and they are spreading everywhere. However, these bacteria on the skin of healthy people are generally harmless and even beneficial. They protect skin health by competing with harmful bacteria for nutrition. Don't be afraid, there are many kinds and quantities of bacteria in our body. The number of bacteria in human body is 10 times that of human cells. There are at least 500 species and 50 trillion bacteria in the digestive tract alone, which add up to 1.5 kg. Bacteria account for 1/3 of the feces discharged by a healthy person every day, of which 75 species are 1 100 million bacteria. The abundance of these bacteria is beneficial to the human body. They inhibit the reproduction of harmful bacteria that enter from outside the body. They also help digest carbohydrates and make vitamins for the human body. Bacteria in the large intestine can produce vitamin K2, which is absorbed and utilized by the human body.