,Tweet Facebook Mail A healthy lifestyle can cut your risk of developing Alzheimer’s or other forms of dementia even if you are at increased risk of developing them, a study has found.People with high genetic risk and poor health habits were about three times more likely to develop dementia versus those with low genetic risk and good habits, researchers reported yesterday.Regardless of how much genetic risk someone had, a good diet, adequate exercise, limiting alcohol and not *** oking made dementia less likely.People with high genetic risk and poor health habits were about three times more likely to develop dementia (iStock)“I consider that good news,” the US National Institute on Aging’s John Haaga said.“No one can guarantee you’ll escape this awful disease” but you can tip the odds in your favour with clean living, he said.Results were discussed at the Alzheimer’s Association International Conference in Los Angeles and published online by the Journal of the American Medical Association.About 50 million people have dementia, and Alzheimer’s disease is the most common type. Genes and lifestyle contribute to many diseases, but researchers only recently have had the tools and information to do large studies to see how much each factor matters.RelatedWA scientists to test world-first Dementia implant after major discoveryAustralian clinical trials testing new approach to tackling Alzheimer's diseaseExperimental pill shows promising results for Parkinson's diseaseOne such study a few years ago found that healthy living could help overcome genetic risk for heart disease. Now researchers have shown the same to be true for dementia.Doctor Elzbieta Kuzma and colleagues at the University of Exeter Medical School in England used the UK Biobank to study nearly 200,000 people, 60 or older, with no signs or symptoms of dementia at the start.Their genetic risk was classified as high, medium or low based on dozens of mutations known to affect dementia. They were also grouped by lifestyle factors.After about eight years of study, 1.8 per cent of those with high genetic risk and poor lifestyles had developed dementia versus 0.6 per cent of those with low genetic risk and healthy habits.Among those with the highest genetic risk, just over one per cent of those with favourable lifestyles developed dementia compared to nearly two per cent of those with poor lifestyles.One limitation: Researchers only had information on mutations affecting people of European ancestry, so it’s not known whether the same is true for other racial or ethnic groups.People who were sedentary, drank unhealthy amounts of alcohol and had poor diets were more likely to develop Alzheimer's and other types of dementia. (EPA/AAP)The study found that clean living will likely reduce your chance of developing Alzheimer's, even if you are at greater risk genetically. (iStock)The results should give encouragement to people who fear that gene mutations alone determine their destiny, Dr Rudy Tanzi, a genetics expert at Massachusetts General Hospital, said.Less than five per cent of the ones tied to Alzheimer’s are “fully penetrant,” meaning that they guarantee you’ll get the disease, he said.“That means that with 95 per cent of the mutations, your lifestyle will make a difference,” Tanzi said.“Don’t be too worried about your genetics. Spend more time being mindful of living a healthy life.”One previous study in Sweden and Finland rigorously tested the effect of a healthy lifestyle by assigning one group to follow one and included a comparison group that did not.It concluded that healthy habits could help prevent mental decline. The Alzheimer’s Association is sponsoring a similar study underway now in the US.Healthy living is also the focus of new dementia prevention guidelines the World Health Organisation released in February.
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