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Making a choice that leads to better health is not always easy.  Otherwise, we would have many more ex-smokers and far fewer holiday pounds to shed.  We would have no need for nicotine gum and patches, or Weight Watcher's meetings.  So if it's that difficult, why bother?  For years, physicians have told the American public that reducing your calorie intake, eating a diet low in salt/sugar/saturated fat, and exercising 3-5 days per week will reduce your risk for heart disease and diabetes.  Now, new information has shown that the benefits of a healthy lifestyle are even more far reaching than initially thought -- diet and exercise can affect our minds. About 5-8% of people over the age of 65, and nearly 50% of people in their 80's, show signs of dementia.  As the baby-boomer generation increases the population of the 55-64 age group in the U.S. from 29 to 40 million by 2014 , and their life expectancy continues to rise, the number of people affected by dementia is poised to increase as well.  Recent studies have shown that regular exercise may prove to be a potent mediator of dementia and Alzheimer's Disease.  In one study, those who exercised 3 or more days per week had a 32% risk reduction in developing dementia compared to those who exercised less.  Exercise has also been linked in similar studies to moderate cognitive improvements in adults who are at risk for Alzheimer's Disease, as well as a lower occurrence of vascular dementia.