If you want to save your brain, focus on keeping the rest of your body well with exercise and healthy habits rather than popping vitamin pills, new guidelines for preventing dementia advise.
Many health conditions and behaviors affect the odds of developing it, and research suggests that a third of cases are preventable, said Maria Carrillo, chief science officer of the Alzheimer's Association, which has published similar advice.
That includes getting enough exercise; treating other health conditions such as diabetes, high blood pressure and high cholesterol; having an active social life, and avoiding or curbing harmful habits such as smoking, overeating and drinking too much alcohol.
"There is currently no evidence to show that taking these supplements actually reduces the risk of cognitive decline and dementia, and in fact, we know that in high doses these can be harmful," said the WHO's Dr. Neerja Chowdhary.
There's not enough evidence to recommend antidepressants to reduce dementia risk although they may be used to treat depression, the report says.