Energy balance
Increased abundance of Lachnospiraceae, particularly Blautia and Roseburia, is associated with metabolic disturbances, including obesity and type 2 diabetes, primarily through enhanced energy extraction from dietary carbohydrates and elevated circulating short-chain fatty acids (SCFAs).
If you are managing weight or blood sugar, be aware that not all fiber-fermenting bacteria are equal. An overgrowth of Lachnospiraceae (like Blautia) can actually increase the calories you absorb from carbohydrates, potentially worsening metabolic health. Focus on dietary patterns that support a balanced microbiome rather than just maximizing 'good bacteria' counts, especially if you consume high-carb diets.
Within Firmicutes, high abundances of Lachnospiraceae were positively correlated with glucose and/or lipid metabolism, indicating metabolic disturbance... carbohydrate digestion by GI microbiota contributes to increasing the energy derived from the diet, and thus, affecting the above-reported fasting blood glucose levels.
Why this rating
The paper is a review citing multiple observational and animal studies; associations are strong but causality in humans is complex and context-dependent.
Source
The Controversial Role of Human Gut Lachnospiraceae
Mirco Vacca et al. · Microorganisms · 2020
DOI 10.3390/microorganisms8040573
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