Diabetes mellitusBlood glucoseMetabolic disorderHyperglycaemic activityCaffeineFluorescence quenchingHOMA-IR and HOMA-BALPHA-LIPOIC ACIDOXIDATIVE STRESSALDOSE REDUCTASEPERIPHERAL-NERVESORBITOL PATHWAYENERGY-METABOLISMGLUCOSEDEHYDROGENASECONDUCTIONCONSUMPTION