Type 2 diabetes is a condition that develops when you have too much sugar, also called glucose, in your blood. Glucose is a type of sugar produced in your body when carbohydrates and other foods are digested. It provides energy to cells throughout the body.
Normally, blood sugar levels increase after you eat a meal. When blood sugar rises, cells in the pancreas release insulin, which causes the body to absorb sugar from the blood and lowers the blood sugar level to normal.
When you have type 2 diabetes, sugar stays in the blood rather than entering the body's cells to be used for energy. This results in high blood sugar. It happens when your body can't use insulin the right way.
Over time, high blood sugar can harm many parts of the body, such as your eyes, heart, blood vessels, nerves, and kidneys. High blood sugar can also increase your risk for other health problems.