(Bloomberg) -- The bacteria that live in the intestinal tract can affect digestion, weight gain, mood and how the body absorbs medicine. UBiome, a Silicon Valley startup, has built a company around sequencing gut bacteria -- which the founders think one day will become as common and medically necessary as a blood test. But it's a long road to that future. First they have to explain to people why they should care about their microbiomes. Next, they need to popularize a test that asks people to swab their toilet paper.
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