A diet rich in green leafy vegetables, beans, berries, whole grains and wine can help to slow normal brain ageing and cognitive decline. A study at Rush University Medical Centre in Chicago showed that elderly adults who strictly followed a special form of theMediterranean diet were 7.5 years younger cognitively over a period of nearly five years than those who adhered the least. Earlier, the researchers showed that the diet may reduce the risk of developing Alzheimer’s disease.