Nonenal vs. Regular Body Odor: What's the Difference?

Have you ever heard of "old people smell"? Maybe you noticed a different kind of scent when visiting a grandparent or an older family member. That unique smell is often linked to a compound called nonenal, which is pretty different from the everyday body odor most of us are used to. But what exactly is nonenal, and how does it differ from regular body odor? Let’s break it down!

So, What’s Regular Body Odor Anyway?
Regular body odor is something most of us are pretty familiar with – it’s that smell that can come up after a workout, on a hot day, or when we’re nervous. Here’s the science-y part: our bodies have two types of sweat glands, called eccrine and apocrine glands. Eccrine glands produce sweat all over our body to keep us cool – it’s mostly water and usually odorless. Apocrine glands, on the other hand, are found mainly in places like our armpits and produce a thicker type of sweat. When the sweat from these glands mixes with bacteria on our skin, it can lead to that typical "body odor."

Introducing Nonenal – the “Aging” Scent
Now, nonenal is a bit different. As we get older, particularly around age 40 and up, the oils on our skin start to change because of hormone shifts. When these oils break down, they produce a compound called nonenal, which has a smell that’s often described as slightly oily or grassy. It’s not “bad,” just unique – and it doesn’t go away as easily as regular body odor.

The Big Differences Between Nonenal and Regular Body Odor

  1. Where It Comes From
    • Regular Body Odor: Caused by sweat mixing with bacteria. It depends a lot on things like what we eat, how active we are, and how often we shower.
    • Nonenal: Comes from natural oils in the skin breaking down as we age. It’s part of a normal aging process, not necessarily a hygiene issue.
  2. When It Appears
    • Regular Body Odor: It can pop up anytime – from our teens through adulthood – and usually depends on activity levels, diet, and hygiene.
    • Nonenal: Mostly starts showing up after age 40. It’s not something you’ll likely notice before then.
  3. How Long It Lasts
    • Regular Body Odor: Easily managed with a shower, deodorant, or a quick refresh.
    • Nonenal: Tends to be more persistent. Even if you’re keeping up with regular hygiene, nonenal can stick around due to changes in skin oils.
  4. How People See It
    • Regular Body Odor: Often considered a sign to freshen up or change clothes, so people think of it as a hygiene thing.
    • Nonenal: Sometimes linked to aging and can carry a bit of a stigma, even though it’s totally natural and normal!

Can You Do Anything About Nonenal?
The good news is, there are ways to keep nonenal in check. Here are some simple tips:

  • Step Up Your Skincare: Washing with a gentle cleanser and exfoliating regularly can help. This keeps your skin fresh and reduces the oils that can produce nonenal.
  • Look at Your Diet: What we eat affects body odor more than we might think! Eating fresh foods and drinking lots of water can make a difference.
  • Stay Hydrated: Water helps flush out toxins from the body, which can help with all types of odors.
  • Choose the Right Products: Some soaps, lotions, and sprays are specifically designed to neutralize nonenal, so you can smell fresh and clean all day.


Aging brings a lot of changes, and nonenal is just one of them. While it’s completely natural, understanding the difference between nonenal and regular body odor can help us feel more comfortable and confident as we age. With a few adjustments in skincare, diet, and personal care products, we can manage nonenal and embrace every age with confidence. So next time you hear about “old people smell,” you’ll know exactly what’s behind it – and what you can do about it!

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