Lipoprotein(a) levels are doubled in left-handed patients with diabetes.

Handedness is a tangible manifestation of cerebral motor lateralization. It is partly hereditary, it arises early in foetal life, and is modulated by intrauterine, perinatal and epigenetic factors. While the molecular bases of handedness have yet to be formally established, genetic studies have hinted at a polygenic origin partly under the control of molecular mechanisms establishing left–right body asymmetry. A previous report had found that non-right-handed (non-RH) patients with type 2 diabetes mellitus (T2DM) had better insulin sensitivity (IS) than their right-handed (RH) counterparts, which was unrelated to differences in obesity, body composition and physical activity. It was also observed that gastrointestinal intolerance to metformin was associated with a lower prevalence of ischaemic heart disease and with being left-handed (LH), whereas being non-RH was over-represented among metabolically-healthy normal-weight T2DM patients without the metabolic syndrome (MetS). Yet, there are virtually no data on lipids, lipoproteins or apolipoprotein (apo) levels as a function of motor laterality. For this reason, our present analysis was performed to determine whether laterality could modulate lipids/lipoproteins, including lipoprotein(a) [Lp(a)], in DM patients [...]