Type 1 Diabetes.
Insulin-dependent is caused by damage to the Pancreas where Pancreas is unable to produce insulin.

Type II Diabetes.
Also called non-isulin dependent diabetes, can be caused either by the deterioration of Beta cell of pancreas which results in in-sufficient insulin production or by the insulin resistance developed by the cells.  

CAUSE/SYMPTOMS of Diabetes.

Cause: Malfunctioning pancreas gland.
Symptoms: High glucose levels in the blood.  

Pancreas, its function and how it is related to Diabetes.

Pancreas is a gland which produces hormones (Insulin) directly into bloodstream.
Insulin helps convert sugar from food into energy for cells via bloodstream.
When pancreas can not produce enough insulin, excess sugar accumulates in the blood and is eliminated via urine. When sugar does not reach cells, body is starved for energy.

Symptoms of malfunctioning pancreas.

Symptoms of malfunctioning pancreas are: weakness, dizziness, cold sweats, excessive thirst, frequent urination, Ketone & acetone (poisons) form in the blood resulting in shock, blackouts, coma and sometimes death.