More activity in the area of the brain that deals with memory may give an indication at as young as 20 that the person may go on to suffer from dementia later in life. The extra activity essentially wears the part of the brain out, hence the memory-related symptoms of dementia.
Volunteers aged between 20 and 35 had their brain activity monitored, and those carrying a rogue version of the gene ApoE4 saw the increase in brain activity.
Identifying those at risk earlier on means the condition could be treated to help alleviate the symptoms. However, it has been highlighted that these developments do not offer a cure, and that further research is needed.