US kombucha market sizeBicyclist traffic fatalities
As the American kombucha market has grown from a niche health food curiosity to a legitimate retail category, more cyclists have been killed on US roads, a correlation that suggests either that fermented tea impairs cycling judgment or that the same urban demographic drinking kombucha is also dying on inadequate bike lanes. The coefficient is 0.932 across thirteen years, during which both curves rose with the determination of trends that know their audience and have no intention of slowing down. The SCOBY is thriving. The cyclists are not.
The US kombucha market grew from about 100 million dollars in 2010 to over 1.8 billion by 2022, driven by gut health trends, the wellness movement, and the mainstreaming of fermented beverages. Cycling fatalities grew from about 620 to over 1,000 during the same period as more people commuted by bicycle in cities without adequate infrastructure. Both trends serve the same health-conscious, urban, sustainability-minded demographic: people who drink kombucha because they care about their microbiome and ride bikes because they care about their carbon footprint. The shared variable is the urban wellness lifestyle—a set of choices that is better supported by the grocery industry than by the road network.
Thirteen years of kombucha and cycling deaths growing together is a portrait of a lifestyle that the market embraces and the infrastructure betrays. The gut flora is healthy, the bike lane is absent, and the correlation between them is the biography of a demographic that deserves better roads. Probiotic, but not protected.
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Want to learn more about why correlations like “US kombucha market size” vs “Bicyclist traffic fatalities” don't prove causation? Read our guide to statistical thinking.