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Supplementation with trans10cis12-conjugated linoleic acid induces hyperproinsulinaemia in obese men: close association with impaired insulin sensitivity. Risérus U, Vessby B, Arner P, Zethelius B. Diabetologia. 2004 Jun;47(6):1016-9. Epub 2004 May 28. PMID: 15168020 DOI: 10.1007/s00125-004-1421-8 Conclusions/interpretation In obese men, t10c12CLA induces hyperproinsulinaemia that is related to impaired insulin sensitivity, independently of changes in insulin concentrations. These results are of clinical interest, as hyperproinsulinaemia predicts diabetes and cardiovascular disease. The use of weight-loss supplements containing this fatty acid is worrying.