Chronic stress physically damages the brain and makes remembering difficult. To reduce stress, relax, focus on breathing, and clear your mind. Eat foods like fruits and vegetables that contain vitamins and minerals known to boost brain power. Drink water and eat smaller, more frequent meals to maintain steady blood sugar levels and optimal mental functioning. Give yourself time without distractions to form strong memories. Getting at least seven hours of sleep each night improves short and long-term memory according to Harvard studies.