Everyone knows what I m talking about. Most of us have a friend or relative who can kick off their shoes and clear an entire room. And even the sweetest smelling person can do a decent job stinking up a pair of shoes by running a few miles in them. So what s going on here? Why can feet create such bad odor?

The source of the smell is sweat! With more than 250,000 sweat glands each, your feet are among the most perspiring parts of the body. In one day, each foot can produce more than a pint of sweat! Sweat is basically just salt and water, though, so it doesn t have a distinctive smell of its own. The smell is actually caused by bacteria on our skin that eats the sweat and excretes waste that has a strong odor. It s perfectly normal to have bacteria on your skin, and it doesn t ordinarily produce a noticeable smell, but sweat attracts bacteria and gives them a whole lot to feed on, especially if you have a lot of sweat like on your feet.

Naturally, we sweat all over - our hands have a comparable number of sweat glands, for example - and most of the rest of our body doesn t particularly stink (the armpits being a notable exception.) So what s different about our feet? The answer is our socks and shoes. The sweat our feet excrete can t easily escape into the air like the sweat our hands excretes - it all collects on our skin and in our socks. The bacteria love this dark, damp feast and have a sort of feeding frenzy. When you take off your shoes, the smell that hits you is all the bacteria excrement that collected on your feet.

The main differentiating factor between why someone s feet (or more precisely, someone s socks and shoes) smell worse than other people s is that some people sweat more than other people. This is just one of the many variable physiological qualities of human beings. This is also why sometimes your feet smell much worse than at other times - it all boils down to the amount of sweat.

So, since foot odor is caused by bacteria digesting sweat, there are two main ways to reduce the stink. You can:

- decrease the amount of bacteria on your feet

- decrease the amount of sweat that collects on your feet and in your shoes

Reducing the level of bacteria is really a matter of cleanliness. To control the bacteria population on you feet, you should:

- wash your feet with strong anti-bacterial soap (E.g. Dettol)

- wear clean socks

- don t wear the same shoes everyday - give a pair of shoes 24 hours or more to air out before wearing them again

To reduce the amount of sweat that collects in your shoes, you should:

- wear well-ventilated shoes instead of very constrictive shoes, such as boots

- always wear socks, preferably made of cotton or other absorbent materials that absorb a lot of the sweat so the bacteria can t feed on it

- change your socks a few times a day

- buy some absorbent Odor-Eater type shoe inserts

- apply an antiperspirant to your feet

If your foot odor is really bad and these solutions don t help much, then you should see a doctor. There are a number of prescription drugs that can treat serious foot odor, some by reducing foot sweat and some by killing bacteria.

Ryan Parker from Smelly Feet Center looks at this problem seriously and why its no laughing matter.

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