随着年龄的增长，皮肤的保护性反应——表层血管的收缩减慢，对低温的反应可以增加代谢率，可老年人的代谢率却在不断减弱，哪一代谢机体的下降却不明。
The skin's protective reaction of constricting surface blood vessels is slower with age, and the cold-induced rise in metabolic rate is also weakened in older people, but the mechanism is unknown.
然而，随着人们年龄的增长，人体变得更善于调节温度，棕色脂肪沉积逐渐收缩，白色脂肪开始出现。
As people age, however, the body becomes more adept at regulating temperature, so brown fat stores shrink and white fat starts to emerge.
这种收缩随着我们年龄的增长会加速，这就是出现记忆力问题和像阿耳茨海默氏病这样的老年痴呆症的征兆。
And this shrinkage speeds up as we grow older, foreshadowing memory problems and dementias like Alzheimer's disease.
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