type 1 diabetes
Persons with type 1 diabetes no longer produce insulin, and they must have insulin injections to use the glucose they obtain from eating.
Persons with type 1 diabetes must give themselves insulin every day. Insulin can either be injected, which involves the use of a needle and syringe, or it can be given by an external or internal insulin pump, insulin pen, jet injector, or insulin patch. Extra amounts of insulin may be taken before meals, depending on the blood glucose level and food to be eaten.
Insulin cannot be taken as a pill. Because it is a protein, it would be broken down during digestion just like the protein in food. It must be injected into the fat under the skin for insulin to get into the blood. The amount of insulin needed depends on height, weight, age, food intake, and activity level. Insulin doses must be balanced with meal times and activities, and dosage levels can be affected by illness, stress, or unexpected events.