Why does our body scent change distinctly as we age? Are there ways to manage it?

— Mahua Ray

A: The distinct scent often associated with ageing is primarily caused by a compound called 2-nonenal. Around 40 years, our bodies’ natural antioxidant defenses start to weaken, allowing certain fats on the skin to break down. For instance, when omega-7 unsaturated fatty acids like palmitoleic acid are exposed to oxygen, they oxidise and produce 2-nonenal.

The typical body odour caused by sweat and bacteria can be easily washed away but 2-nonenal is an unsaturated aldehyde and repels water. So standard soaps and water often can’t remove it, allowing the scent to persist even in individuals with excellent hygiene.

In Japan, products containing persimmon extract (which in turn contain tannins) are known to be chemically effective at neutralising the 2-nonenal odour. Second, since the scent is a result of oxidation, a diet rich in antioxidants such as berries, green tea, and leafy greens can help mitigate oxidative stress on the skin. Staying well-hydrated also helps flush toxins out.

2-nonenal also clings to fabrics, particularly cotton, so washing clothes and bed linens frequently, if possible using odour-neutralising additives like baking soda, can keep the scent from building up in the environment.