Type 2 diabetes happens when your body can’t use insulin the right way or when the pancreas can’t make enough insulin. Insulin is a hormone that helps the body’s cells use sugar (glucose) for energy. It also helps the body store extra sugar in muscle, fat, and liver cells.
Without insulin, this sugar can’t get into your cells to do its work. It stays in your blood instead. Your blood sugar level then gets too high. High blood sugar can harm many parts of the body, such as the eyes, heart, blood vessels, nerves, and kidneys. It can also increase your risk for other health problems (complications).