Bacteria also come in all kinds of shapes, strings, spheres, oblongs. But they aren’t all bad guys. In fact, without them, we wouldn’t survive very long. We need them to digest food, to produce vitamins. We use them to fight off the bad bacteria. In spite of what you’re reading in the papers this week, they are more helpers than hurters.

New research shows that we may have gut “types,” just as we have blood types, based upon what type of bacteria we have in our gut. ¬†This may have a lot of implications for the way we eat, and why some of us have different reactions to the same kinds of foods.

For more on this, read this fun article from NPR correspondent Robert Krulwich on his science blog by clicking here.