Research
Mixed
Reduced gut microbial diversity (alpha-diversity) and specific taxonomic shifts (e.g., depletion of Akkermansia muciniphila and Faecalibacterium prausnitzii) are consistently associated with obesity and metabolic syndrome, serving as a marker of a less resilient microbiome.
Focus on dietary patterns that support microbial diversity (e.g., fiber-rich diets) rather than seeking simple diagnostic ratios. A diverse diet supports a resilient microbiome, which is associated with better metabolic health.
GoodSupportsHIGH confidence
Numerous studies have shown that individuals with obesity or metabolic syndrome frequently exhibit reduced gene richness and α-diversity, suggesting a less resilient and functionally limited microbiome.
Why this rating
Supported by multiple human studies, meta-analyses, and consistent findings across populations, though causality is complex.
Source
Gut microbiome and obesity care: Bridging dietary, surgical, and pharmacological interventions
Davide Masi et al. · Cell Reports Medicine · 2026
DOI 10.1016/j.xcrm.2025.102573
narrative_reviewCited 6×
Read the paper DOI resolved against Crossref · corpus check 2026-06-10
More from this paper
- Dietary patterns significantly shape the gut microbiome, with fiber-rich diets increasing diversity and beneficial bacteria, while high-fat diets decrease diversity and promote pro-inflammatory species.Strong
- Short-chain fatty acids (SCFAs) like butyrate, propionate, and acetate promote satiety and improve metabolic health by stimulating GLP-1 and PYY secretion and modulating gut-brain signaling, despite inconsistent fecal level measurements in obesity.Good
- Elevated circulating branched-chain amino acids (BCAAs) and imidazole propionate (IMP) are causally linked to insulin resistance and type 2 diabetes, serving as predictive biomarkers years before clinical onset.Good
Related findings · Mixed
- Bariatric surgery (VSG and RYGB) is the most effective and sustainable treatment for obesity, producing marked and sustained weight loss that non-surgical interventions cannot match.Strong
- Severely protein-deficient diets (2–3% energy) induce lean body mass loss and metabolic imbalance, whereas adequate protein intake (0.66 g/kg/d minimum) is a prerequisite for maintaining muscle, bone, and physiological function.Strong
- For patients with Class III obesity (BMI >39.9 kg/m2), metabolic bariatric surgery (MBS) is significantly more effective than any currently approved medication, with BilioPancreatic Diversion (BPD) showing the highest estimated weight loss.Strong
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