A healthy lifestyle can increase your brain's health. According UCLA professor of neurosurgery and physiological science Fernando Gomez-Pinilla, diet, exercise and sleep can alter your brain heath and mental functions. Exercise like walking, although not strenuous, is good for your brain. It increases blood circulation and the amount of oxygen and glucose that reaches your brain, helping you to think more clearly. Exercise also boosts endorphins, which can reduce feelings of stress. Omega-3 fatty acids, which are found in healthful foods such as salmon and walnuts, help improve learning and memory and help fight against depression and mood disorders. Get seven or eight hours of sleep. Adequate sleep aids in the learning and memory process, the ability to concentrate and helps maintain an elevated mood.