Bacteria Behavior and Names Bacteria, just like any other living organism, will do what it takes to ensure their survival. This means they will seek the best environments and food sources to thrive.

In your gut, there are trillions of microorganisms that make up your gut microbiome. Your gastrointestinal (GI) tract is home to many bacteria, fungi, and viruses. This isn’t a bad thing, though.

When it comes to persistent bad breath, the types of probiotic bacteria found in fermented foods like yogurt, sourdough bread and miso soup may help ease the offending odor, a new study suggests.