Diabetes is a condition that happens when the amount of blood sugar (also called glucose) in the blood becomes too high. Glucose is the main source of energy for the body and comes mostly from the food you eat. Normally, insulin, a hormone made by the pancreas, helps glucose from your food get into your cells to be used for energy. But if your body can’t produce enough insulin or produces none at all, too much sugar remains in the blood. High blood sugar levels can cause many health concerns.