A recent meta-analysis on resveratrol treatment as an adjunct topharmacological management in type 2 diabetes mellitus reported a significant reduction offasting glucose, insulin, glycated Hb (HbA1c) and insulin resistance levels in participantswith type 2 diabetes(34) but did not affect glycaemic measures in non-diabetic individuals(35). This evidence concerns the gene GSTM1 and type 2 diabetes mellitus.