Obesity has been linked to an increased risk of alzheimer's disease because extra weight affects how the brain metabolizes sugar.
But when researchers did brain scans and cognitive tests on 17 obese women before and after bariatric surgery they had normal metabolism and improved planning, organizing and strategizing abilities.
In other health news, new study finds wine drinkers who limit how much they pour are less likely to over indulge.
Researchers asked a group of college students and staff to pour themselves an amount of wine they considered normal.
Those who had a rule to pour only half a glass at a time poured 20% less wine overall than people without set guidelines.
Overweight and obese men poured more than normal weight men but BMI had no effect on how much wine women poured.
Copyright 2015 Nexstar Broadcasting, Inc. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed.