Hello and welcome to healthcare magic. Sugar level spikes after taking meals is known as Postprandial hyperglycemia. Blood sugar levels of non diabetics rarely exceed 140mg/dl. If you are having persistently high levels it means your glucose tolerance is impaired and you are at risk of developing type 2 diabetes and cardiovascular events. There are several risk factors impaired glucose tolerance (also known as pre diabetes ) e.g Obesity sedentary lifestyle family history Pregnancy In healthy people, glucose levels in the blood always rise after a meal but they soon return to normal as the glucose is used up or stored. A GTT helps to distinguish between this normal pattern and the patterns seen in diabetes and impaired glucose tolerance. Evidence has shown if impaired glucose tolerance is caught and treated early progression of type 2 diabetes and its complications can be slowed and even prevented WHAT YOU NEED TO DO : Investigte your self RBS FBS GTT HBa1C At the moment, lifestyle changes are the most important thing if you are found to have impaired glucose tolerance LIFE STYLE CHANGES: eat healthy and balanced diet (low in fats , high fibre , starchy food , friuts and vegetables) do regular exercise lose weight if you are obese quit smoking limit alcohol intake also make sure your BP is normal by regularly checking it. MEDICATIONS : If these life style modifications fail to control your high sugar levels you will be started on medication. Most commonly metformin , an oral hypoglycemic drug , is prescribed. Hopefully this will help you. If you are satisfied kindly rate my answer Regards Dr. Shah