Alzheimer’s has a range of disparate risk factors, but researchers may now have found one underlying cause that links them all: a lack of oxygen.

Previous studies have shown that diabetes, stroke, clogged arteries and ageing all increase the risk of developing Alzheimer’s, and only 5% of cases appear to have been strongly influenced by genetic factors. Now evidence has emerged that lack of oxygen may be the ultimate cause.

[Read](http://www.newscientist.com/article.ns?id=dn10613&feedId=online-news_rss20 “Read the Story”) (New Scientist)