Red wine may go to your head, but it also helps you to think, according to research carried out at Northumbria University. Tests led by psychologist Emma Wightman found that the red wine extract polyphenol resveratrol could improve mental performance. The ingredient changes the blood flow in the brain, resulting in significant improvements in cognitive performance, she found. It is the first time the effect had been tested in healthy adults. The component is also found in foods including fruit and vegetables.