Hormonal
Genetically predicted higher circulating levels of branched-chain amino acids (isoleucine, leucine, and valine) causally increase the risk of developing type 2 diabetes.
This research suggests that for individuals with specific genetic variants (like those affecting the PPM1K gene), the body's ability to break down branched-chain amino acids (found in protein) is impaired, leading to higher blood levels of these amino acids and a significantly increased risk of type 2 diabetes. It highlights that metabolic processing of protein varies by genetics. If you have a family history of diabetes, discussing your metabolic health with a doctor is important, but do not arbitrarily eliminate protein without professional guidance, as the root cause here is a specific enzymatic bottleneck, not protein itself for the general population.
Evidence from this large-scale human genetic and metabolomic study is consistent with a causal role of BCAA metabolism in the aetiology of type 2 diabetes.
Why this rating
Large-scale Mendelian Randomization with 47,877 cases and 267,694 controls provides robust causal inference, minimizing reverse causality and confounding.
Source
Genetic Predisposition to an Impaired Metabolism of the Branched-Chain Amino Acids and Risk of Type 2 Diabetes: A Mendelian Randomisation Analysis
Luca A. Lotta et al. · PLoS Medicine · 2016
DOI 10.1371/journal.pmed.1002179
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