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Researchers followed 45,000 men and 15,000 women, ages 20 to 88 years, in the United States for an average of 17 years. Six times as many people in the low fitness group suffered from dementia, compared to those who exercised regularly. While deaths in the United States associated with heart disease, breast cancer and stroke have declined in recent years, deaths related to dementia and Alzheimer's disease rose 46 percent between 2002 and 2006.
Another exciting study, from Japan, shows that many of the benefits that exercise provides to muscles are also provided to your brain (The Journal of Physiology. February, 2012;590(Pt 3):607-16).
THE STUDY: Adult male rats exercised to exhaustion at moderate intensity on a treadmill. Glycogen, sugar stored in muscles, was depleted by 82-90 percent. One day later, the rats' muscles could store 43-46 percent more than they could originally. In a like manner, brain glycogen levels decreased by 50-64 percent with exhaustive exercise, and were able to store
29-63 percent more on the next day. The greater the depletion of sugar in muscles and brain, the greater the ability to store more sugar after the rats were fed. The brain filled with sugar before the muscles did and after four weeks of training, the rats' brains could store significantly more glycogen.
EXPLANATION: Sugar is the most efficient source of energy for your muscles during intense exercise. Sugar is the most efficient source of energy for your brain ALL the time. When you exercise regularly, you increase the ability of your muscles to store sugar so you can move faster and longer. This study suggests that exercise also increases the energy supply to your brain, which will help you to think and reason better.