过去研究过铝，说铝摄入过多可能与阿尔兹海默症（Alzheimer's）有关。这回研究的是铜。但最近的结果还是有争议的，与过去的几项研究结果相反。
Copper linked to Alzheimer's disease
By James Gallagher
Mixed evidence on the role of copper in Alzheimer's
A lifetime of too much copper in our diets may be contributing to Alzheimer's disease, US scientists say.
However, research is divided, with other studies suggesting copper may actually protect the brain.
The latest study in Proceedings of the National Academy of Sciences showed high levels of copper left the brain struggling to get rid of a protein thought to cause the dementia.
（发表于美国国家科学院院刊的一项最新的研究认为高水平的铜摄入或令铜在脑血管中积蓄并干扰血脑屏障，使脑部难以排除可能引发痴呆症的蛋白质---淀粉样蛋白（beta amyloid）。）
Copper is a vital part of our diet and necessary for a healthy body.
Tap water coming through copper pipes, red meat and shellfish as well as fruit and vegetables are all sources of dietary copper.
BarrierThe study on mice, by a team at the University of Rochester in New York, suggested that copper interfered with the brain's shielding - the blood brain barrier.
Mice that were fed more copper in their water had a greater build-up of the metal in the blood vessels in the brain.
The team said this interfered with the way the barrier functioned and made it harder for the brain to get rid of a protein called beta amyloid.
One of the hallmarks of Alzheimer's disease is the formation of plaques of amyloid in the dying brain.
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《中国好声音》第二季- 第五期 刘彩星: 橄榄树
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