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"The brain thrives on a fat-rich, low carbohydrate diet, which unfortunately is relatively uncommon in human populations today," reports David Perlmutter, author of Grain Brain. "Mayo Clinic researchers showed that individuals favoring carbohydrates in their diets had a remarkable 89 percent increased risk for developing dementia as contrasted to those whose diets contained the most fat. Having the highest levels of fat consumption was actually found to be associated with an incredible 44 percent reduction in risk for developing dementia."

3:49 video, Alzheimer's disease is the most common cause of dementia, affecting over 40 million people worldwide. And though it was discovered over a century ago, scientists are still grappling for a cure. Ivan Seah Yu Jun describes how Alzheimer's affects the brain, shedding light on the different stages of this complicated, destructive disease.

In the war against aging, Alzheimer's disease is one of our biggest foes. But while we seem to be losing the battle, we may finally have found some chinks in its armor. The most common form of dementia already affects an estimated 5.2 million Americans and 45 million others worldwide, and these numbers are projected to triple by the year 2050 as the baby boomer generation reaches retirement.

Health care costs have been a hot button topic in recent years, and rightfully so. The United States spends an extraordinary amount of money on health care each year - $9,523 for every man, woman and child to be exact. This totals over 1 trillion dollars, accounting for roughly 17 percent of the United States' gross domestic product (GDP). The federal government spends 27 percent of its total budget on health care. Astonishingly more than it spends on the military, food and agriculture, education, transportation, and international affairs combined. So where is all the money going? Strangely enough, to combat just a few diseases.

Blood type may affect brain function as we age, according to a new large, long-term study. People with the rare AB blood type, present in less than 10 percent of the population, have a higher than usual risk of cognitive problems as they age.