A forty-year study of Swedish twins between 1963 and 2002 has found that those who had a higher body-mass-index when they were middle-aged had 'significantly lower general cognitive ability' and 'significantly steeper decline' than their thinner counterparts over time. The study - headed by Anna Dahl, from Jonkoping University in Sweden - found the same results for men and women and that obesity was particularly damaging where there were other health problems such as poor muscle strength or depression.
You can find out more about this research at
http://www.sciencedaily.com/releases/2010/02/100223154344.htm?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+sciencedaily+%28ScienceDaily%3A+Latest+Science+News%29&utm_content=Google+Reader
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