Type 1 Diabetes
Diabetes mellitus type 1,  Type I diabetes, or  juvenile diabetes is a form of diabetes mellitus. It is an autoimmune disease that causes the permanent destruction of insulin producing cells in the pancreas. Type 1 diabetes is fatal  unless it is treated with exogenous insulin injections.

Type 1 diabetes used to be known as childhood, juvenile, or insulin-dependent diabetes is not only a childhood disease. The adult incidence in adults who contract Type 1 diabetes are often misdiagnosed with Type 2 diabetes because of the misconception that Type 1 diabetes is a disease of children.

Currently there is no preventive measures against type 1 diabetes. Many people that are affected by type 1 diabetes are generally healthy and have a normal body weight when they get diabetes, but may can lose body weight quickly if the type one diabetes is not diagnosed quickly. Proper diet and more exercise will not help or prevent someone from getting type 1 diabetes. There are some clinical trials that hope to find different methods of prevention or to at least slow type 1 development, but at this time none has proven very successful.