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Obesity, Morbid / Obesity · Journal article
Gut Microbes · August 24, 2026
Encouraging direction, but not yet definitive.
In this prospective cohort of 85 patients undergoing bariatric surgery, baseline Bifidobacterium abundance was inversely associated with fat mass loss at 24 months, suggesting a 'thrifty microbiome' phenotype that limits surgery-induced weight reduction. The finding is based on direct microbiome sequencing and measured body composition, but lacks independent replication and controlled experimental validation.
Prospective observational cohort study with healthy control group. 85 patients with severe obesity undergoing bariatric surgery and 21 normal-weight healthy controls; bariatric surgery patients assessed for MedDiet adherence and type 2 diabetes status.. Intervention: Bariatric surgery. Compared with: Normal-weight healthy controls (baseline microbiome comparison); post-surgical changes tracked longitudinally; fat mass loss stratified by baseline Bifidobacterium quartiles.. n = 106. Not stated.
Baseline obese patients showed higher microbial Shannon diversity than normal-weight controls (p = 0.041) Baseline dysfunctional microbiome characterized by higher Firmicutes/Bacteroidetes ratio and elevated branched-chain amino acids (p < 0.0001) At 12 months post-surgery, Bifidobacterium spp. depleted and butyrate levels increased (p < 0.0001)
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If validated, this finding could support pre-operative microbiome profiling to identify patients at risk of suboptimal fat loss and candidate populations for personalized microbiome-directed interventions prior to bariatric surgery. The inverse relationship is counterintuitive and suggests that higher baseline Bifidobacterium may enhance metabolic efficiency and energy harvest, limiting post-surgical weight reduction.
A prospective observational study with a clear finding linking baseline microbiome composition to long-term fat mass loss after bariatric surgery, but limited by single-centre design, lack of randomization, and modest sample size.
As stated by the source record.
Quoted from the source exactly as published.
If validated, this finding could support pre-operative microbiome profiling to identify patients at risk of suboptimal fat loss and candidate populations for personalized microbiome-directed interventions prior to bariatric surgery. The inverse relationship is counterintuitive and suggests that higher baseline Bifidobacterium may enhance metabolic efficiency and energy harvest, limiting post-surgical weight reduction.
Graded across the dimensions that decide whether you should act, each from what the source actually supports. There is no single score, and where a dimension was not assessed it says so.
Bariatric surgery (BS) induces weight loss, but long-term success involves complex host-microbiome interactions. We evaluated the longitudinal impact of BS, microbiome resilience, and Mediterranean Diet (MedDiet) adherence up to 24 months. This prospective observational study included 85 patients with severe obesity undergoing BS and 21 normal-weight healthy controls (HC). MedDiet adherence (PREDIMED) was assessed before surgery. Fecal microbiota (16S-rRNA sequencing) and metabolomics (1H-NMR spectroscopy) were analyzed at baseline and at 1-, 6-, and 12-months post-BS. Clinical outcomes and fat mass, evaluated by bioimpedanciometry, were tracked up to 24 months. At baseline, patients exhibited higher microbial Shannon diversity than controls (p = 0.041), alongside a dysfunctional microbiome and metabolome characterized by a higher Firmicutes/Bacteroidetes ratio and elevated levels of branched-chain amino acids (p < 0.0001). Ordinary Least Squares (OLS) regression analysis revealed that MedDiet adherence and type 2 diabetes status significantly modulated baseline diversity. At 12 months post-BS, the gut ecosystem underwent profound remodeling, characterized by depletion of Bifidobacterium spp. and an increase in butyrate levels (p < 0.0001), establishing a novel adaptive state distinct from HC. Baseline gut ecology significantly conditioned long-term BS outcomes: patients in the highest quartile of baseline Bifidobacterium spp. lost significantly less fat mass at 24 months than those in the lowest (6.6% vs. 13.2%, p = 0.010). High baseline Bifidobacterium abundance paradoxically acts as a "thrifty microbiome," potentially maximizing energy harvest and limiting surgery-induced fat loss. Overall, BS induces adaptive microbiome restoration rather than true normalization, highlighting the potential for precision interventions prior to surgery.
Taken from the source record, never inferred. Follow any of these and new work involving them reaches your briefing.