An apple a day keeps the doctor away, as the saying goes. And not just any doctor. An apple a day may help keep the neurologist away—along with the cognitive decline that often accompanies aging and neurodegenerative diseases like Alzheimer's and Parkinson's.
Food scientist Chang Y. Lee found that a nutrient in apples can protect rat brain cells from damage. The nutrient, an antioxidant called quercetin, provided even more protection than Vitamin C, which is known to combat neurodegenerative diseases in humans.
Quercetin belongs to a group of substances getting a lot of attention these days—flavonoids. These are naturally occurring chemical compounds that help give plants their color. Most flavonoids, as well as certain vitamins and minerals, are potent antioxidants; they neutralize harmful free radicals of oxygen, produced when cells burn oxygen for energy. If left unchecked, free radicals cause cumulative cell damage that may lead to cancer or, in the case of brain cells, Alzheimer's, Parkinson's or other age-related mental decline.
"Quercetin has much higher antioxidant activity compared to other flavonoids and Vitamin C," says Lee. His work has shown that not only may quercetin help brain cells, but also it may actually hurt cancer cells. In his lab experiments, quercetin blocked some of the pathways by which tumors grow out of control, and once again, in this task quercetin outperformed Vitamin C.





















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