Alternative names: BO, B.O., Bromhidrosis, Bromidrosis
Conventional wisdom suggests that perspiration (sweat) is the cause of body odor. However, perspiration by itself is basically odorless: body odor is in fact caused by bacteria on our skin breaking down the sweat and producing smelly waste products.
The armpits are an ideal place for bacteria to thrive: they are moist, warm, usually dark, and well supplied with tasty body secretions. If no countermeasures are taken, the bacteria will multiply quickly.
Thousands of different types of bacteria can potentially inhabit human skin and (in particular) the armpits, but only a few are responsible for body odor.
The other places where bacteria can produce odors are the feet, groin (genitals, pubic hair), other hair, belly button, anus, behind the ears, as well as the rest of our skin to a lesser degree.
Body odor is unique to each person, which is why dogs and other animals can use it to identify people. In some cases it can even be pleasant. Many factors can influence a person's body odor, for example their gender, diet, overall health, and medications being used.
Body odor usually becomes noticeable once we reach puberty.
The average human has between 2 and 5 million sweat glands on their body. These glands come in two varieties. Eccrine glands are found all over the body and help cool the body when the sweat they produce evaporates.
Apocrine glands are glands that produce odorless oily secretions that develop their characteristic smells when broken down by bacteria. They are found in the armpits, genital area, breasts, eyelids, nostrils, perianal region, and ears. In the breasts they secrete fat droplets into breastmilk, and in the ears they help form earwax.
Researchers at the University of York reported in 2015 that when bacteria break down these odorless compounds, they produce chemicals called thioalcohols. These waste products are often very pungent and smell similar to sulfur, onions, or meat. These compounds then evaporate from the armpits and become a smelly nuisance.
Another potential cause of body odor is the foods, chemicals, and medicines that we ingest. Examples of odor-causing foods include garlic, onions, and curry spices: when broken down by the body, these produce sulfur-containing waste gases that escape through the pores in our skin. Any imbalances in metabolism can result in stronger odors. Note however that in 2015 it was found that garlic may actually improve body odor because of its antibacterial properties.
When a person drinks more alcohol than their liver can break down, some of it is excreted through their breath and sweat.
Smelly waste products can also be the result of toxins that accumulate in our bodies. In today's world we are bombarded with toxins in our homes, food, and air that accumulate in the body when the organs of elimination cannot dispose of them. The liver, kidneys, and intestines may be 'clogged up', causing odors to escape through the skin. In this case, a thorough detoxification program that cleanses the liver, kidneys and colon may be useful.
Dietary imbalances – resulting in constipation or a deficiency of magnesium or zinc – can also be causes of body odor. Because of different body chemistries, some people have a very distinctive body odor which can be quite offensive. Some individuals cannot metabolize foods containing large amounts of choline, such as eggs, fish, liver and legumes. The result is a 'fishy' smell. If you are one of these people, cut out these products and see if this is the cause of your odor.
Some other possible cause of body odor:
Stress also plays a role in body odor. When we are stressed, the apocrine glands produce "stress sweat" which contains a milky fluid consisting of proteins, carbohydrates and lipids. This causes the smelliest types of body odor when broken down by bacteria. In contrast, when we exercise, our eccrine glands produce sweat contains mainly water and electrolytes (salt), which does not cause such odor problems.
Treating body odor is more a case of prevention rather than cure.
It goes without saying that wearing clothes several times between washing will lead to an accumulation of oils, bacteria, and odors, so change clothes frequently. The same goes for bras: don't wear the same bra two days in a row. Avoid synthetic fabrics such as spandex, which trap sweat and cause odors to linger. Breathable fabrics such as cotton, sheer mesh, or lightweight lace are able to wick away moisture more easily.
Shower at least once a day to remove sweat and bacteria, using 'antibacterial' soap if preferred. After washing, dry yourself completely – especially in the areas susceptible to body odor.
Wear socks with closed shoes, and change socks regularly. Without socks to absorb the moisture, the feet are essentially bathing in their own sweat and bacteria. Remember also that antiperspirant can be applied to the feet if necessary, and deodorant powder is available for use in shoes. If possible, take shoes off every once in a while during the day, and give shoes time to air out by not wearing the same pair for two days in a row.
Use a deodorant or antiperspirant. Deodorants have a scent that masks the smell, whereas antiperspirants reduce sweating and often include a deodorant as well. Higher strength and prescription antiperspirants are available if necessary. Note that most commercial antiperspirants and deodorants function by blocking sweat glands (which can lead to irritation and swelling) and/or killing underarm bacteria (which can also kill good bacteria.)
Most of us have experienced sweating and body odor when exercising, too warm, or nervous, anxious or under stress. This is completely normal, and some people naturally sweat more or less than other people. However, changes in sweating or body odor may be a sign of an underlying medical problem.
For this reason it is important to visit a doctor if you:
One or two chlorophyll tablets or chlorophyll liquid taken with each meal may help, as chlorophyll is a great deodorizer.
Since toxic overload may be one of the causes, try taking steam baths or saunas frequently as part of an overall detoxification program.
Dietary changes are very important in eliminating various sources of odor. Certain foods, such as meat, onions, garlic, exotic spices, and drinks such as coffee and alcohol can lead to body odor. Try eliminating these from your diet for a week or two and see if this makes a difference. Although you can usually smell your own B.O. if it is from your armpits many people don't realize they have general body odor because they have become accustomed to it. Have someone you can confide in do a "smell test" – before and after you start eliminating certain foods. That may be the only way you will find out.
Clothing is an area many people overlook. Loosely-fitting clothes allow the body to breathe better than tight clothes. The perspiration escapes and doesn't become a breeding ground for bacteria. The type of fabric is also very important. Synthetic fabrics for shoes and clothes don't allow the body to breathe, so use all-natural fabrics. Wash your clothes often.
As well as causing bad breath, tobacco use is a major cause of body odor. Not only does it come back through your lungs, but it comes through the skin. It probably mixes with other elements of your body's chemistry to create a distinct odor. If you stop smoking it may take several weeks for the body to rid itself of odor-causing substances.
Bathe daily to remove bacteria from your skin, especially the armpits and groin area where the bacteria is most prevalent. Scrub the armpits with a soapy washcloth as that will work better to remove the bacteria than just soap in your hands. Deodorant soap is preferable as it helps fight bacteria more than regular soaps. If you have a serious odor problem, soak for fifteen minutes or longer in a tub of water with three cups of tomato juice added. (Tomato juice also works on you and your pets if you have been "skunked"!)
Try taking zinc tablets. Zinc, plus magnesium, will help balance your body's metabolism and reduce the cause of bad odor. Studies have shown that taking 30 to 50mg daily will dramatically reduce certain body odors, although you may need less. Zinc may also reduce perspiration and sweaty feet.
Take magnesium supplements or augment your diet with food sources high in this important mineral. Between 200-500mg of magnesium daily has been recommended. You will have to try different doses until you get the amount that is right for your body. See the links between Body Odor and Vitamin B-Complex / Zinc.
For excessive underarm odor, try using a mild solution of hydrogen peroxide (3%) – cheap, effective, widely available. Put a teaspoonful in a glass of water and wash the underarm. If that doesn't work, increase the amount of peroxide.
A unique herbal deodorant exists that is free of aluminum and other harsh chemicals, yet so effective that just one application can eliminate perspiration odor for days without the need to reapply even after showering. This product is available from most health food stores. Lavilin makes a foot deodorant also. Ingredients: zinc oxide, petroleum jelly, talc, potato starch, calendula oil, arnica oil, vitamin E, ascorbyl palmitate, citric acid, natural fragrance.
See the link between Body Odor and Vitamin B-Complex.
See the link between Body Odor and Vitamin B-Complex.
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