Diabetes Mellitus, ExperimentalStreptozocinDiabetes Mellitus, Type 2Diabetes MellitusDiabetes Mellitus, Type 1Rats, WistarDiabetes ComplicationsBlood GlucoseInsulinHypoglycemic AgentsDiabetes, GestationalDiabetic NeuropathiesDiabetic NephropathiesAlloxanDiabetic RetinopathyHemoglobin A, GlycosylatedHyperglycemiaDiabetic AngiopathiesRisk FactorsIslets of LangerhansGlucose Tolerance TestBlood-Retinal BarrierRats, Sprague-DawleyBody WeightTime FactorsAlbuminuriaGlucoseGlycosuriaInsulin ResistanceKidneyPrevalenceObesityGlycosylation End Products, AdvancedPregnancy in DiabeticsRetinal VesselsDiabetic KetoacidosisPentaerythritol TetranitrateBody Mass IndexHypertensionBlood PressurePrediabetic StateCase-Control StudiesGlucose IntoleranceProspective StudiesHypoglycemiaFollow-Up StudiesCardiovascular DiseasesCohort StudiesSulfonylurea CompoundsInsulin-Secreting CellsDiabetes InsipidusRats, Inbred StrainsMetforminOxidative StressSciatic NerveIncidenceBlood Glucose Self-MonitoringNeural ConductionReference ValuesRetrospective StudiesC-PeptideHypertrophyKidney GlomerulusFastingDisease Models, Animal