Type 1 diabetes (T1D) is an autoimmune disease in which your immune system, which is designed to fight infection, attacks the cells in the pancreas that make insulin, called beta cells. This means that individuals with T1D will ultimately require insulin to manage it. However, T1D progresses in stages, and the attack on beta cells starts much earlier than symptoms show up and before the need for insulin injections. Stages 1 and 2 of T1D are collectively referred to as ‘early-stage’ T1D, marked by the presence of 2 or more islet autoantibodies, with normal blood sugar levels in stage 1, and slightly elevated blood sugar levels in stage 2. Stage 3 marks the clinical diagnosis of T1D, when symptoms as well as high blood sugar levels are apparent.