Longevity Expert Reveals Everyday Food That Neutralizes Aging-Related Odor

The Science Behind "Old People Smell" and How Mushrooms Can Help

The distinctive "old people smell" — often described as musty or sour — isn’t due to poor hygiene but a natural chemical process linked to aging. Longevity expert Leslie Kenny explains that mushrooms, rich in unique compounds, could help neutralize this odor.

What Causes the Odor?

As we age, omega-7 fatty acids in skin oils (sebum) oxidize, producing a compound called 2-nonenal. This scent becomes more pronounced because aging skin produces fewer antioxidants to protect lipids from breaking down. Slower skin cell turnover also allows 2-nonenal to accumulate, embedding the odor in skin, clothing, and bedding. A 2010 Japanese study first identified 2-nonenal in people over 40, confirming its role in the "old person smell."

Caption: Mushrooms are rich in ergothioneine and spermidine, compounds that target the root cause of age-related odor.

Mushrooms: A Natural Solution

Mushrooms offer a two-pronged attack against 2-nonenal. Ergothioneine, a potent antioxidant found abundantly in mushrooms, protects skin lipids from oxidizing. Humans can’t produce this compound naturally — it’s primarily sourced from mushrooms like shiitake, oyster, and champignon.

Spermidine, another key compound in mushrooms, boosts autophagy — the body’s cellular recycling process. This helps shed old skin cells faster, reducing 2-nonenal buildup. Kenny recommends eating mushrooms 3–4 times weekly for best results.

Caption: A trial found daily champignon mushroom extract reduced odor compounds in adults aged 50–79.

Scientific Backing

In a 2019 clinical trial, 80 adults aged 50–79 took champignon mushroom extract daily. Those consuming 1,000 mg saw significant reductions in body odor, bad breath, and even pillow scent. The extract neutralized foul-smelling gut compounds like ammonia and methyl mercaptan, breaking them into odorless forms.

A Finnish study also highlighted mushrooms’ role in regulating the breakdown of linoleic acid, the same fatty acid that produces 2-nonenal. Varieties like shiitake and oyster mushrooms ranked highest in antioxidants.

Beyond Odor Control

Mushrooms offer broader health benefits: slowing cancer progression, improving insulin resistance, and supporting brain health. Kenny, who manages autoimmune conditions through diet, incorporates mushrooms into meals like stir-fries and soups.

Caption: Mushroom extract has been shown to lower ammonia and methyl mercaptan levels linked to bad odors.

Why Perfumes Fall Short

While scented products mask the smell temporarily, they don’t address its root cause. "Lipid oxidation occurs deep within the skin, and perfume just layers on top," says Kenny. Mushrooms, however, tackle the issue internally.

Final Advice

For those experiencing age-related odor, Kenny emphasizes mushrooms’ dual role: preventing oxidation and accelerating cell renewal. "They’re not just a superfood for longevity — they’re a practical solution to feel fresher as we age."

By prioritizing mushrooms in your diet, you’re not just fighting odor — you’re investing in a healthier, more vibrant aging process.

(Word count: ~600)