Bacteria live in your body

Where some bacteria live in the human body.

Bacteria are present on our skin, in our gut, and in many of the foods that we eat - ALL the time! In fact, there are about 10 times more bacterial cells in and on the body than there are human cells!  Most bacteria are harmless, and some are quite helpful. We don't notice them, but we need these bacteria to keep our bodies working normally!

(Hint:  Click on regions of the human body to learn more about bacteria living there.)

Bacteria help us make certain foods

Many foods that you eat every day are made with the help of bacteria.  Certain types of bacteria convert natural sugars found in food into acids as part of a process called fermentation.  These acids give foods including yogurt, vinegar, and salami their characteristic flavors.