Digestive 
Blood
Cardiovascular
Dermatology
Genitourinary,
Hormones
Infections
Oncology and
Musculo-skeletal
Mental health and
Parasites
Respiratory
Senses
Various
Type 1 diabetes usually begins in adolescence. It results from the body's inability to produce insulin. People with this type of diabetes need to have insulin administered daily to control their blood glucose (sugar) levels.
There are different types of insulin: fast and slow (and the area where it is injected affects the rate of absorption). Absorption is very fast in the area around the navel, mildly fast on the arms and slow in the thighs.
