Body odour is one of those things everyone experiences, but few people fully understand.
It’s often blamed on sweat, hygiene, or even diet.
In reality, body odour has a very specific cause.
Sweat itself doesn’t smell
This is the most important thing to understand.
Sweat, on its own, is largely odourless.
The body produces different types of sweat. Eccrine sweat is mostly water and salt and helps regulate body temperature. Apocrine sweat, released in areas like the armpits, contains proteins and lipids.
Neither type smells by itself.
Where body odour actually comes from
Body odour develops when specific bacteria on the skin break down components of apocrine sweat into smaller compounds that smell.
This process creates the characteristic odour people associate with sweating.
So the smell is not caused by sweat alone, and it’s not caused by bacteria in general.
It’s caused by odour-causing bacterial activity interacting with specific sweat.
The role of the skin microbiome
Your skin is home to a microbiome: a diverse community of microorganisms that help maintain skin health and balance.
Most of these bacteria are harmless or beneficial.
Body odour is not a sign that bacteria are “bad” or that skin is unclean. It’s simply the result of certain bacterial processes.
Healthy skin balance depends on managing odour-causing activity without disrupting the microbiome.
Why washing alone doesn’t always prevent odour
Showering removes sweat and bacteria from the skin’s surface.
But bacteria naturally return quickly after washing.
That’s why odour can come back even when you feel clean. The conditions for odour formation can return as soon as sweat and bacterial activity interact again.
Why stopping sweat isn’t required
Because sweat itself isn’t the cause of odour, stopping sweat is not the only solution.
Sweating is a normal and healthy function that helps regulate body temperature.
Managing odour effectively means focusing on what happens after sweat is released.
What this means when choosing a deodorant
Understanding what causes body odour changes how deodorant should work.
Effective deodorants focus on neutralising odour-causing bacterial activity while respecting the skin’s natural microbiome.
If you want a deeper explanation of what makes a natural deodorant effective, you can read our full guide here:
What’s the most effective natural deodorant?
The takeaway
Body odour is not caused by sweat alone.
It’s caused by specific bacterial activity interacting with apocrine sweat.
Once you understand that, preventing odour becomes much more straightforward.
Fresh armpits worldwide.