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5 Things Researchers Found About Body Odor, Skin Oils, and the New Smell Some People Notice During Rapid Weight Loss

Why showering more, switching deodorants, and washing the same shirts twice may still leave behind a sharper, unfamiliar smell.

By Edith Thompson

Last updated August 11, 2026

1. Losing Weight Fast Can Create an Odor Your Deodorant Was Never Designed to Remove

You shower every day. You switched deodorants—twice. You wash the same shirts more often. And it’s still there: something sharper. Sour. Almost metallic. Not bad hygiene. Just… not you.

Whether the change follows a new medication, a strict diet, or months of hard training, many people notice it first on their skin, collars, pillowcases, or halfway through a workout.

Here’s what almost nobody explains: some odor is water-based and rinses away. Some is oil-based—and clings to skin and fabric.

2. Everything on Your Bathroom Shelf Uses the Same Playbook. This Odor Doesn’t.

Deodorant. Antiperspirant. Body spray. Another shower.

Mask the smell. Block the sweat. Rinse with water.

Valid approach. Wrong chemistry.

Oil-based compounds don’t dissolve easily in water. Water runs over them like it runs over a greasy pan. Fragrance doesn’t remove them either—it simply creates another layer on top.

You didn’t get careless with hygiene.

Your routine didn’t fail. It was built for a different kind of odor.

3. For Centuries, Japan Has Used One Fruit to Remove the Odor Water Leaves Behind

Kakishibu—fermented Japanese persimmon tannin—has been used in Japan for generations to deodorize and preserve materials.

Modern research suggests persimmon tannin can interact with odor molecules on contact, including the oily compounds that cling to surfaces.

Deodorants mask. Antiperspirants block.

Persimmon tannin does neither. It helps bind odor compounds so they can be washed away.

This isn’t a stronger deodorant. It’s a different tool entirely.

4. Researchers Confirmed That Some Body Odor Comes From Skin Oils

Japanese researchers identified an odor compound called 2-nonenal. It forms when natural oils on the skin oxidize.

Two properties matter: it clings to skin and fabric, and it is not readily soluble in water.

That helps explain why a clean shirt or pillowcase can seem to smell again shortly after washing.

2-nonenal was documented in the context of skin changes after 40. But the broader lesson is simple:

Oil-based odor behaves differently from ordinary sweat—and water alone may not remove it.

5. Not Everything Labelled “Persimmon Soap” Contains What Actually Matters

Some products use persimmon fragrance. Others contain only a small amount of generic fruit extract.

A persimmon on the packaging is not the same as kakishibu Japanese persimmon tannin.

Look for a body bar built around real persimmon tannin, a gentle cleansing base, and a guarantee long enough to judge the difference yourself.

That is why YUDO was created: Japanese persimmon tannin in one simple body bar for men and women.

No complicated protocol.

Just 30 seconds during your normal shower.

What Deodorant Covers and Water Can’t Rinse, YUDO Was Designed to Wash Away

Washes Away. Not Over.

4.8/5 Excellent Based On 3,798 Reviews

YUDO Japanese Persimmon Body Bar uses kakishibu persimmon tannin to help target persistent odor directly on the surface of the skin—instead of covering it with another layer of fragrance.

One bar. 30 seconds a day.

For all-day freshness, gentler daily cleansing, and the confidence to get close without thinking twice.

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