Studies from four universities: Researchers have discovered a possible connection between dysfunction of the dentate gyrus and poor glucose regulation. This may explain earlier observations that exercise benefits the dentate gyrus. Until now, scientists believed that physical activity reduced the risk of age-related memory loss by allowing glucose to be absorbed more quickly into muscle cells, but were not sure why. (Lite, Jordan. Exercise Your Brain: Why Working Out May Help Memory. Scientific American, 2008, article)
Exercise not only increases longevity but it also gives you more energy. Three basic types of physical activity that help to make one younger include general physical activity, stamina-building activities, and strength/flexibility exercises. (Roizen, Michael F., MD. Real Age: Are You As Young As You Can Be? NY: HarperCollins Publishers, 2001, pp 211, 262)
Refer to Exercise and the Brain for additional information.