11,336 people mailed used toilet-paper samples to scientists; the unusual project revealed the huge diversity of microbes in the human gut

Thousands of people contributed toilet paper samples for a large gut microbiome study. This citizen science project gathered extensive microbial sequence data from many participants. The vast dataset revealed greater microbial diversity than previous smaller studies. Eating more plants was linked to a more diverse gut microbiome, while antibiotics reduced it. Researchers used DNA tests and metabolomics to analyze the collected gut microbe samples.
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