[Why do feet stink?] What causes foot odor? First, we will explain the substances that cause the odor and the characteristics of people who are prone to foot odor. [Iso-valeric acid is the main cause of foot odor] When you think of smelly feet, what kind of smell do you imagine? Foot odor is said to smell like natto or have a sour smell. The cause is a substance called "iso-valeric acid" or "acetic acid". Iso-valeric acid has a pungent odor that can be compared to natto or cheese, and it has a strong odor. It is so strong that it is regulated as a specific odorous substance under the Offensive Odor Prevention Act established by the country. As you can imagine from the name, acetic acid has a sour odor, and both are unpleasant and unpleasant odors. So how do these odors occur? [How foot odor occurs] The soles of the feet have many sweat glands and are the part of the body that sweats most easily. Sweat itself has almost no odor, but wearing shoes or socks causes sweat to evaporate, making it harder for the feet to dry. As a result, the air becomes steamy and humid, creating an environment in which bacteria can easily grow. In addition, humans are home to bacteria known as resident flora on their skin. Resident flora play a role in protecting the skin from external stimuli, but they produce isovaleric acid in the process of breaking down sebum and keratin. In other words, when bacteria grow, more isovaleric acid, the cause of the odor, is produced, which causes your feet to smell.
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