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Given the variety of early-onset dementias , how can specialists determine who has which disease ?

各种早发型痴呆中，专家们如何能确定病人患的是哪一种呢？

And if enhanced , the substance could help ward off dementias and other memory problems .

如果加大剂量可以帮助防止痴呆和其他记忆问题。

By 2050 more than 100 million people worldwide will have alzheimer 's disease or other dementias , scientists estimate , and far more will struggle with age-related memory decline .

科学家估计，在2050年以前，全世界将会有超过1亿人罹患爱耳茨海默或者其它的痴呆，而且会有更多的人挣扎在年龄相关的记忆减退上面。

A panel convened by the national institutes of health in july cautioned , however , that there isn 't enough evidence to conclude that such activities prevent alzheimer 's disease or related dementias .

但在今年七月美国国立卫生研究院的一个座谈会上人们发现，并没有足够的证据表明大脑的活跃程度与阻止痴呆症及相关症状有必然联系。

People who are obese in middle age are at almost four times greater risk of developing dementias such as alzheimer 's disease in later life than people of normal weight , according to a study released today .

据近日发表的一篇研究报告称，过度肥胖的中年人罹患痴呆症的风险比正常体重的人高出大约4倍，比如阿兹海默症。