As I had touched upon earlier, Thomas Addison conducted research in adrenal insufficiency in 1855 and he was the one who came up with Addison's disease. Recall that this results in weakness, loss of appetite, nausea, vomiting, and hyper-pigmentation.
Image source: Wikipedia.com
Moving on to the pancreas. The pancreas is responsible for producing insulin. Banting, Best, and Macleod were the 3 people responsible for the discovery of insulin. Type I diabetes cannot be cured, but can be treated using insulin. Type II diabetes, well, your best bet is to lose weight as soon as you can!