Middle-age adults who go on periodic drinking binges may face a heightened risk of dementia later in life, a new study suggests.Researchers found that even among adults who usually drank moderately, those who occasionally binged were more likely than their peers to develop dementia over the next 25 years.Overall, middle-age adults who binged at least once a month -- downing, for instance, five bottles of beer or a bottle of wine in one sitting -- had a three-times greater risk of developing dementia, including Alzheimer’s disease.The findings are published in the medical journal Epidemiology.