Are you losing your keys all the time? If you want a sharper memory, munch on an apple or a pear. Turns out these yummy fruits contain a mineral called boron, which improves memory and alertness levels. Experts also say mashed potatoes and barley can cause almost instantaneous memory boosts. (Pssst...go easy on the barley and potatoes, people. They're calorie-packed!) Wondering what other foods that are great for memory improvement? Blueberries, strawberries and spinach. Yum!