GLOSSARY

Roseburia includes butyrate-producing gut species, without one species or animal result validating every preparation.

For example, read a post-travel or post-diet sample with the same period's history; a teammate difference or striking percentage alone is neither a supplement target nor proof of lost readiness.

Phylum, family, genus, species and strain are different taxonomic levels; one strain's result cannot automatically represent its whole genus. Scientific revisions change names while older names remain in reports. Match current and historical names when comparing labels with studies. A ratio between two large phyla alone does not diagnose obesity, health or athletic readiness, and classification is not a ranking of universal benefit.

Microbiota refers to organisms in an environment; microbiome can also include their genes and ecological setting, depending on the definition. Gut communities contain more than bacteria, and intestinal regions differ. Stool offers a useful view of part of this system, not a complete map of small-intestinal or mucosal populations. Define the sample and terminology before interpreting a report as a description of the entire body.

Relative abundance is a share of the measured total, not an absolute count. A larger share may reflect declines elsewhere rather than growth of that organism. Extraction and analysis also influence estimates. Interpret before-and-after diet percentages with these constraints and the wider community. A colorful chart alone does not demonstrate causality, establish an ideal population size or justify trying to eliminate every low-abundance organism.

Microbes interact with substrates, chemistry, the host and one another, rather than forming a simple good-versus-bad list. Cooperation, competition and use of another organism's products coexist. A species' effect depends on strain, location and context. In sports nutrition, a varied tolerable dietary pattern is more useful than maximizing one bacterial name without human evidence. Ecological relationships cannot be inferred from a single abundance measurement alone.

Composition identifies detected groups; functional potential concerns genetic capacity, while activity concerns what is actually expressed or produced. Different communities can share functions. A gene's presence does not guarantee a particular metabolite output. Organism names alone therefore establish neither extra usable energy nor improved absorption, strength or recovery. Distinguish taxonomic detection, measured activity and meaningful human outcomes when assessing a microbiome claim.

Microbiomes vary between people and over time within one person, influenced by diet, medicines, geography, age and bowel habits. Stability concerns limited change over an interval; resilience concerns recovery or adaptation after disturbance. Record sampling conditions and recent events for personal comparisons. Being different from a teammate is not by itself unhealthy or a reason to copy that athlete's diet, supplements or presumed microbial target.