Geographic variation of human gut microbes tied to obesity -- ScienceDaily

Researchers know that obese people have a different balance of microbes
in their guts: more Firmicutes, fewer Bacteroidetes. Now researchers
have found that people living in northern latitudes have a greater
proportion of the Firmicutes associated with obesity than do people
living farther south, and a smaller proportion of Bacteroidetes. The
implications are unclear, though microbes may evolve with people to
better extract energy from food in colder climates.

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