Consumer gut microbiome testing has become a $2 billion industry, but leading gastroenterologists warn that most commercial tests provide unreliable results and misleading dietary recommendations.
The Problem
A study published in Nature Medicine sent identical stool samples to five leading microbiome testing companies and received five dramatically different results, with contradictory dietary advice from each.
Expert Advice
Doctors recommend focusing on proven dietary principles — high fiber, fermented foods, plant diversity — rather than spending $200-400 on tests with questionable clinical value.
- $2B consumer testing market
- 5 companies gave contradictory results for same sample
- No FDA regulation of consumer microbiome tests
- 30+ plant foods weekly remains best evidence-based advice
