Daily Mail | Discovered: a protein that could diagnose dementia early Daily Mail Brain changes which cause people with Alzheimer's to get lost could lead to a test for the disease before it strikes. Scientists have found for the first time that a protein called tau caused by Alzheimer's clogs up navigational cells in the brain. It ... Scientists have discovered why dementia patients get lost - and it's all to do with GPS Alzheimer's protein buildup disrupts the brain's navigation center |