More than 55 million people live with dementia, and it is one of the biggest causes of death and disability worldwide.
Research shows a healthy lifestyle can cut the chances of getting dementia, even for people whose genes put them at increased risk.
Scientists have shown 7 healthy habits seem to stop up to 43% of people developing the condition.
Eating well, exercising and not smoking all play a big part in preventing dementia.
Researchers have found that people whose genes put them at increased risk of dementia can reduce their chances of getting the condition by up to 43% if they follow seven habits for healthy living.
It was already thought that a healthy lifestyle could cut the risk of dementia, but until now it has been less clear if this applied to people with genetic variants that make them more likely to develop the condition.