There are many foods that have been shown to have an improving effect on memory. These are usually foods that are high in antioxidants and/or Omega 3 fatty acids. For example, one study showed that 300 grams of blueberries improved memory in as little as three weeks. I have compiled an article that outlines which foods are good at memory boosting. If you want to check it out it is http://www.ehow.com/how_4618889_improve-memory-food.html