Insulin resistance and the metabolism of branched-chain amino acids.
Level 5 - mechanism / opinion, no new human data
Narrative review of epidemiological and mechanistic literature without systematic methodology or primary human data
PubMed 23385611 · doi:10.1007/s11684-013-0255-5
What was done
This is a narrative review summarizing epidemiological and mechanistic literature on the relationship between insulin resistance and branched-chain amino acid (BCAA) metabolism (valine, leucine, and isoleucine).
What was found
The abstract reports general background figures: BCAAs account for 35% of essential amino acids in muscle proteins and 40% of preformed amino acids required by mammals. It notes that circulating BCAA concentrations are elevated in insulin resistance and insulin deficiency, and that BCAAs are involved in regulating glucose homeostasis and body weight. No quantitative study results or effect estimates are reported in the abstract.
Why it matters
It highlights that insulin resistance affects global metabolic networks beyond carbohydrates, establishing altered amino acid metabolism as a key feature of metabolic dysregulation.
Limits
As a narrative review, it lacks systematic search methodology, formal quality assessment of included studies, and quantitative synthesis. The abstract does not provide primary data or specific effect sizes.
Cited by
- supports Muscle protein is made up of 20 amino acids, of which 9 are essential and 3 are branched-chain amino acids.