Diabetes is a disease that occurs when the blood sugar (also called blood glucose) is too high. Blood sugar is the main source of energy and comes from the food consumed.
Insulin, a hormone which is build in the pancreas, promotes the uptake of glucose from the blood into liver, fat and skeletal muscle cells to be used for energy production. When having a diabetes, the body doesn’t produce enough — or any — insulin or cannot use insulin well. The result is that glucose remains in the blood and can’t reach the cells.