Body odour is a human trait. It is perceived to be smell given off from our bodies when bacteria on your body breaks down sweat into acids, which gives off a very pungent smell. Body odor is known to become prominent if it is not taken care of at an early age of 14-16 in females and from 15-17 years of age in males. Eating spicy foods, esp. in obese people is common and individuals of these kinds including people having diabetes are susceptible to having body odor.
Some people who have a natural inference towards sweat, are also known to give off a lot of body odor, however the salt levels in the sweat get too high for the bacteria to break them down. This all is dependent on the kind of glands giving off sweat and how much it is.
Referring to Medilexicon’s medical dictionary:
Bromhidrosis is a term meaning a perspiration of foul smell. After puberty, apocrine bromhidrosis affects the axillae and eccrine bromhidrosis is generalized, with too much sweating.
Only due to the swift development of bacteria is the odor given to the sweat produced, otherwise sweat itself is basically an odorless substance. The sweat is eventually broken down into acids causing unpleasant smell. Our opinion of that smell being unpleasant has been influenced since birth and it is how it has been perceived for a long time or you can call it human nature. This phenomenon is likely to occur in our feet, groin, armpits, genitals, pubic hair and other hair, belly button, anus, behind the ears and to some extent on the rest of our body’s skin.
Every other person has a distinct and unique body odor and usually makes use of identifying people through this scent by dogs or any other animal. This odor can be influenced by your diet, personal hygiene, or gender.
There are two types of acids commonly present if there is body odor:
It is no surprise if you find propionic acid in sweat since it is generally found in it. Some people may detect vinegar like acid smell with propanoic acid because it is same to acetic acid, which gives vinegar its foul taste and pungent smell.
Isovaleric acid is considered another source of a body odor due to the result of bacteria acting. Staphylococcus epidermis is a mutual bacteria found in cheese as well as in our skin to break down sweat into stinky acids!