Diabetes is a metabolic disorder that affects how the body produces and uses insulin – a hormone produced by the pancreas – which is vital to normal absorption of glucose (sugar) into the body's cells to be used as energy. If you have been diagnosed with diabetes, your body may be producing too little insulin, may not be able to use insulin efficiently, or may be affected by some combination of both issues, which lead to abnormally high levels of glucose in the bloodstream.