Normally, the food that we eat is broken down into glucose. Sugar and starches (from food) are digested by enzymes and converted into glucose. Glucose passes into the bloodstream, where it is used by cells for growth and energy. Entering glucose into cells  are helped by insulin hormone. Insulin is a hormone produced by the pancreas, a large gland behind the stomach. While we eat, the pancreas will produce insulins to move our glucose from blood into our cells.

Diabetes is a disorder of metabolism. Diabetes is a disease in which the body can not produce or use insulin. There are two major type of diabetes, They are type 1 diabetes, type 2 diabetes and gestational diabetes.

Type 1 diabetes   is an  autoimmune. It means, the immune system attacks and destroys the insulin-producing beta cells in the pancreas. The result of destroying insulin is there is not enough insulin which can enter/bring glucose into cell. The person who has type 1 diabetes must take insulin daily to live.

Symptoms of this disease is increased thirst and urination, hunger, weight loss and for the term can cause kidney problems, pain due to nerve damage, blindness, and heart and blood vessel disease.

Type 2 diabetes is an insulin resistance. The pancreas can produce insulin but our body fails to properly use insulin. After several times, insulin production will decrease, blood glucose increase, and the body cann’t make main source of fuel energy

Gestational diabetes is a condition in which women without previously diagnosed diabetes exhibit high blood glucose levels during pregnancy. There is no evidence what cause it, but it is believed that the hormones produced during pregnancy reduce a woman's sensitivity to  insulin, resulting in high blood sugar levels.