标题：揭秘「老人味」：年龄增长引发的身体异味
随着年龄的增长，一些上了年纪的人可能会发现自己身体上有一种被称为「老人味」的特殊气味。这种味道并不是所有人都有，但对于那些有的人来说，它可能会成为他们的困扰。那么，究竟什么是「老人味」？它又是如何产生的呢？
「老人味」是一种在人过了40岁以后，身体发出的一种很不友好的味道。这种味道的源头是体内脂肪酸被氧化后产生的一种叫作2-壬烯醛的物质。随着年龄的增长，这种物质的含量会逐渐增加，导致「老人味」的味道越来越大。如果生活环境不通风，或者长时间处于封闭的空间中，这种味道会越来越浓郁。
那么，为什么上了年纪的人会出现「老人味」呢？这主要是因为随着年龄的增长，人体的新陈代谢会逐渐减慢，脂肪酸的氧化过程也会变慢，从而导致2-壬烯醛的产生增多。此外，随着年龄的增长，人体的皮肤也会变得更加干燥，这也可能会加重「老人味」的味道。
英语如下：
Title: Unveiling “Old People’s Smell”: Unfriendly Signals from the Body After 40
Keywords: Old people’s smell, body odor, slow metabolism
Content: Title: Unveiling “Old People’s Smell”: The Special Odor Caused by Ageing
As people age, some elderly individuals may find that they have a peculiar scent on their bodies, commonly referred to as “old people’s smell”. This odor is not present in everyone, but for those who do experience it, it can be quite bothersome. So, what exactly is “old people’s smell”? And how does it come about?
“Old people’s smell” is an unfriendly scent that emerges from the body after the age of 40. The source of this odor is a substance called 2-nonenal, which is produced when fatty acids are oxidized in the body. As one ages, the amount of this substance increases, leading to a stronger “old people’s smell”. If living conditions are not well-ventilated or if one spends long periods in enclosed spaces, this odor can become even more pronounced.
So, why do older individuals develop “old people’s smell”? This is mainly due to the fact that as one ages, the body’s metabolism slows down, causing the oxidation process of fatty acids to also slow down, resulting in increased production of 2-nonenal. Additionally, as one ages, the skin becomes drier, which may also contribute to the intensity of “old people’s smell”.
【来源】https://www.zhihu.com/question/639595342
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