Push to improve dementia diagnosis
15 May 2013 Last updated at 09:15 BST
The NHS in England has been told to push for a rapid rise in dementia diagnosis rates, so that by 2015, two out of three cases are identified.
Currently fewer than half of people with dementia have a diagnosis.
A senior adviser on public health says dementia cases could be halved if more were done on prevention.
Adam Brimelow reports.