Hi, You should start with antidiabetic drugs, 200 mg post meal is at higher side, To control it usually antidiabetic drug like metformin or gp1 is prescribed, Increased level of blood glucose has various effects on body,it causes nephropathy,retinopathy,increased cardiovascular accidents,delayed wound healing,sustained ill health, To keep diabities in control with antidiabetic drug and strict diet along with regular exercise is necessary. And get level of your hba1c checked it gives you average of 3 months diabetic control it should be below 6.5, Visit a diabetologist,get your test done and start with antidiabetic drug, Wish you a healthy life, Hope this information helps.