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Your Firmicutes/Bacteroidetes ratio is within the normal reference range. This balanced ratio supports adequate butyrate production from Firmicutes while maintaining the metabolic benefits of Bacteroidetes.
Your Firmicutes/Bacteroidetes ratio is critically low, indicating a noticeable imbalance with a very high proportion of Bacteroidetes and minimal Firmicutes. While low F/B ratio is sometimes associated with lean body types, very large depletion of Firmicutes (which includes many butyrate-producing species) can indicate significant dysbiosis, malnutrition, or gut disease.
Seek medical evaluation. Gut microbiome assessment and nutritional review are needed.
F/B ratio critically low — noticeable Firmicutes depletion; gut microbiome dysbiosisYour F/B ratio is below the reference range. A lower ratio (more Bacteroidetes relative to Firmicutes) is often seen in individuals with plant-rich diets and lean body composition. However, adequate Firmicutes (including butyrate-producing species) are needed for colon health.
Discuss in context of your overall gut microbiome diversity. Ensure adequate fermentable fiber intake to support butyrate-producing Firmicutes.
F/B ratio below reference range — Bacteroidetes dominant; may indicate lean or plant-dominant microbiomeYour F/B ratio is at the lower end of normal. This pattern is common in individuals with plant-rich diets and healthy body weight.
No action needed. Ensure dietary fiber diversity to support a balanced microbiome.
F/B ratio: low-normal — Bacteroidetes slightly dominant; generally acceptableYour Firmicutes/Bacteroidetes ratio is within the normal reference range. This balanced ratio supports adequate butyrate production from Firmicutes while maintaining the metabolic benefits of Bacteroidetes.
No specific action required. Continue a fiber-rich diet.
F/B ratio within reference range — balanced gut microbiome compositionYour F/B ratio is in the optimal range, reflecting a well-balanced gut microbiome with good representation of both major phyla.
No action needed. Maintain diverse fiber-rich diet.
F/B ratio: optimal — well-balanced gut microbiomeYour F/B ratio is above the reference range. An elevated F/B ratio (Firmicutes-dominant gut) is associated with increased calorie extraction from food, higher obesity risk, and metabolic syndrome. This microbiome pattern has been consistently found in overweight and obese individuals.
Increase dietary plant diversity, reduce processed foods and red meat, increase fiber intake, and consider adding fermented foods. Regular exercise has been shown to shift the F/B ratio favorably.
F/B ratio 2.0–3.0 — borderline elevated; Firmicutes dominant; obesity-linked microbiome patternYour F/B ratio is significantly elevated, indicating a strongly Firmicutes-dominant gut microbiome. This pattern is consistently associated with obesity, metabolic syndrome, insulin resistance, and chronic low-grade inflammation. The Firmicutes-dominant microbiome extracts more calories from food and produces more pro-inflammatory metabolites.
Seek functional medicine or gastroenterology consultation. Comprehensive dietary overhaul with high plant diversity and reduced ultra-processed foods is essential. Metabolic health testing (fasting glucose, HbA1c, lipids) should be reviewed.
F/B ratio >3.0 — elevated; strongly Firmicutes-dominant; metabolic dysfunction riskYour F/B ratio is critically elevated. Extreme Firmicutes dominance with near-complete Bacteroidetes depletion represents a very dysbiotic gut microbiome with major implications for metabolic health, immune function, and systemic inflammation.
Seek urgent functional medicine or gastroenterology evaluation. Comprehensive gut microbiome restoration therapy and metabolic health assessment are needed.
F/B ratio >10 — critically elevated; noticeable Firmicutes dominance; significant metabolic disruptionUpload your lab report and get your actual values interpreted in plain English — instantly, with no medical training required.