Type 2 diabetes, Taking hypoglycemic drugs, Age 40-70 years, Body mass index 18.5–30 kg / m 2, Fasting blood sugar equal to or more than 126 mg / d
exclusion criteria: Type 1 diabetes, Other specific types of diabetes, Insulin therapy over the past three months, Having serious gastrointestinal diseases (GI), Have a history of diabetic ketoacidosis, non-ketotic hyperosmolar diabetic coma, severe infection or surgery in the previous month, Uncontrolled high blood pressure, mental illness, Abuse or addiction to alcohol, psychoactive substances or other drugs, Pregnancy, lactation or plan to become pregnant, Having cardiovascular disease, renal insufficiency, liver dysfunction, thyroid dysfunction, parathyroid dysfunction, and cancers, High physical activity, Chronic complications of diabetes (neuropathy, retinopathy, according to patient records), diabetic nephropathy, hypothyroidism and hyperthyroidism, Sensitivity to nettle, Vaccinium myrtillus