Starches are a complex carbohydrate that has no taste or odor, which are granular or powdery in physical form. Complex carbohydrates are long chains of simple sugar units bonded together and for this reason the complex carbohydrates are usually referred to as polysaccharides.
Excess carbohydrate or starch in the body can cause generalized vascular disease. The high-carbohydrate diet which is now so popular causes the pancreas to produce large amounts of insulin in the body. Because insulin's action is to drive glucose into the cells, this will results in chronic hyperglycemia, also called "high blood sugar."
Excess insulin also causes hypertension and helps start the sequence of events in the arterial wall which leads to atherosclerosis and heart disease.