IAPP and α‐synuclein, as well as Aβ and tau, have been found to be colocalized in pancreatic β cells in patients with synucleinopathies, which may underlie the appearance of insulin resistance in non‐T2DM AD, PD, or dementia with Lewy bodies patients.35, 36. Here, IAPP is linked to synucleinopathy.