The number of people with dementia worldwide may not grow as quickly as predicted, an international dementia expert says.
Alzheimer's Disease International has estimated there will an increase from 44 million people to 135 million living with the memory-destroying disease by 2050.
Sussex Medical School Professor of Dementia Sube Banerjee says that's a consequence of improved longevity due to better medicine.
But he says there is hope in the discovery that everything that is good for your heart is also good for your head.
"There's been some really interesting data from the United Kingdom that suggests that, compared to 20 years ago, the population now has a slightly lower level of dementia than you'd expect, and that is largely due to improvements in lifestyle and cardiovascular health."