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Genetic study involving 6 nations finds everyone falls into one of these categories. Similar to the classification of blood types, the bacteria in our guts appear to fit into one of three categories that have no relation to our nationality, age, sex and other characteristics, new research indicates. The study combined genetic information from about three dozen people in six countries, revealing that everyone falls into one of three categories they dub enterotypes, which they believe are spread around the globe just like blood types.