The microbiome field is undergoing a fundamental shift—from cataloging which microbes are present to understanding what they actually do. Drawing on presentations from Nutrition 2026, this article examines growing evidence that microbial composition alone often fails to explain health, disease, or dietary response, while functional measures such as metabolomics and microbial metabolite production may provide more meaningful clinical insights. It explores why two individuals can have vastly different microbial communities yet produce similar biological outputs, challenging the value of composition-based stool testing. As researchers increasingly prioritize microbial function over taxonomy, the article highlights how this transition could redefine microbiome diagnostics, precision nutrition, and the future of microbiome-based therapeutics.
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