Professor Carol Brayne, from Cambridge University's Institute of Public Health, said Alzheimer's could be tackled simply by becoming more active:
Simply tackling physical inactivity, for example, will reduce levels of obesity, hypertension and diabetes, and prevent some people from developing dementia as well as allowing a healthier old age in general - it's a win-win situation.
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Labour members who make "disgusting" anti-Semitic remarks should be expelled, shadow cabinet minister Jonathan Ashworth has said.
After the man fell onto the tracks at a central Sydney station, six other men jumped down onto the tracks to help him.
The unnamed woman is the first ever to complete the famously gruelling marine officer training since the job was opened to women.