Here’s and excerpt from article which you can find here.
Latent Autoimmune Diabetes in Adults (LADA) is a genetically-linked, hereditary autoimmune disorder that results in the body mistaking the pancreas as foreign and responds by attacking and destroying the insulin-producing beta islet cells of the pancreas. Simply stated, autoimmune disorders, including LADA, are an “allergy to self.”
In its early stages LADA typically presents as type 2 diabetes and is often misdiagnosed as such. However, LADA more closely resembles juvenile (type 1) diabetes and shares common physiological characteristics of type 1 for metabolic dysfunction, genetics, and autoimmune features, but LADA does not affect children and is classified distinctly as being separate from juvenile diabetes.