What causes Alzheimer’s? Not toxic amyloid, new study suggests

Many researchers have argued that the accumulation of toxic beta-amyloid in the brain causes Alzheimer’s. However, a new study offers some evidence contradicting this sequence. Alzheimer’s disease affects over 5.5 million people in the United States and millions more around the globe. Yet, researchers are still at a loss as to why this condition — which is characterized by memory impairment and many other cognitive problems — occurs in the first place.
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