Branched-chain amino acid metabolism and microbiome in adolescents with obesity during weight loss therapy
Adolescents with severe obesity show elevated serum BCAAs but reduced BCKAs, a pattern distinct from obese adults who exhibit elevation of both.
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What the study showed
Adolescents with severe obesity displayed higher serum BCAAs but lower BCKAs compared to healthy-weight controls, differing from the adult obesity pattern. This metabolic signature was sex- and age-dependent. Gut microbiome diversity was similar between groups, though composition and functional potential differed.
How it was done
Prospective cohort enrolling 220 adolescents with severe obesity and 67 healthy-weight controls aged 10-18; blood, stool, and clinical measures collected at baseline and 6 months post-intervention; targeted quantitative mass spectrometry metabolomics and fecal microbiome profiling; germ-free mouse FMT experiments performed.
Risk of bias
The abstract appears truncated, omitting FMT mouse outcome data and limiting causal interpretation. The human component is observational; associations between microbiome features and clinical outcomes cannot establish causality.
What this study does NOT prove
This study does not prove that microbiome composition or BCAA dysregulation causes obesity or insulin resistance in adolescents.
In clinical practice
Metabolic biomarkers validated in adult obesity studies should not be uncritically applied to adolescent populations. No new clinical intervention is supported by this evidence alone.
Limitations
The abstract appears truncated, omitting FMT mouse outcome data and limiting causal interpretation. The human component is observational; associations between microbiome features and clinical outcomes cannot establish causality.
Technical appendix
Version history
- 1.0 · 2026-07-18 — Auto-generated under Evidence Standard v1.0
Paid access: structured summary from public metadata; consult the original study at the source.