13 July 2014
One in three cases of Alzheimer's disease worldwide is preventable,
according to research from the University of Cambridge.
The main risk factors for the disease are a lack of exercise,
smoking, depression and poor education, it says.
Previous research from 2011 put the estimate at one in two cases,
but this new study takes into account overlapping risk factors.
Alzheimer's Research UK said age was still the biggest risk factor.