Why do armpits smell like onions?

When the bacteria break down the sweat they form products called thioalcohols, which have scents comparable to sulfur, onions or meat. "They're very very pungent," says Bawdon.

npr.org - Meet The Bacteria That Make A Stink In Your Pits - NPR

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Meet The Bacteria That Make A Stink In Your Pits

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The human armpit has a lot to offer bacteria. It's moist, it's warm, and it's usually dark. But when the bacteria show up, they can make a stink. That's because when some kinds of bacteria encounter sweat they produce smelly compounds, transforming the armpit from a neutral oasis to the mothership of body odor. And one group of bacteria is to blame for the stink, researchers say. The researchers took bacteria commonly found in the armpit and added an odorless molecule found in human sweat. "These odorless molecules come out from the underarm, they interact with the active microbiota, [and] they're broken down inside the bacteria," explains Dan Bawdon, a postdoctoral researcher at the University of York in England, who led the study. When the bacteria break down the sweat they form products called thioalcohols, which have scents comparable to sulfur, onions or meat. "They're very very pungent," says Bawdon. "We work with them at relatively low concentrations so they don't escape into the whole of the lab but ... yes, they do smell. So we're not that popular." The thioalcohol molecules evaporate from the underarm, which is what makes the armpit smelly. So Bawdon and his advisor Gavin Thomas, a senior lecturer in microbiology at the University of York, measured how much thioalcohol each bacteria species produced. In the end, they could point to Staphylococcus hominis as one of the worst offenders. They announced their findings Monday at the Society for General Microbiology's annual conference in Birmingham, England. The two researchers are hoping that their findings will change the way that we engineer deodorants fight body odor. Most deodorants block sweat glands or kill off underarm bacteria. Blocking the sweat glands sometimes leads to irritated or swollen skin. And given all the new research into the complexity of the human microbiome, the researchers are a little anxious that deodorants may kill good bacteria, too. It's hard to say whether the bacteria in the armpit are helping the human body the way that gut bacteria or skin bacteria do. "But it kind of makes sense to not kill everything," says Thomas. "As we know from antibiotics, if we can design something specific that's probably going to be a more sensible approach." He and Bawdon envision a deodorant that would keep armpit bacteria from producing thioalcohols. They borrowed their bacteria from Unilever, a company in the Netherlands and the United Kingdom that produces personal care products. The company provided a small amount of funding so that it can use the research results to make next-generation deodorants. But before such a deodorant shows up on the shelf, the researchers need to make sure that there aren't other smelly processes taking place in the armpit. There may be other molecules that make the armpit smelly, and the researchers haven't yet finished their quest to describe them all. "It's an extremely exciting time to be a microbiologist," Thomas says. Of those many denizens of the armpit, he says, "We haven't yet really figured out why they're there and exactly what they're all doing."

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What drinks help you lose weight?

The 8 Best Weight Loss Drinks Green Tea. Share on Pinterest. ... Coffee. Coffee is used by people around the world to boost energy levels and lift mood. ... Black Tea. Like green tea, black tea contains compounds that may stimulate weight loss. ... Water. ... Apple Cider Vinegar Drinks. ... Ginger Tea. ... High-Protein Drinks. ... Vegetable Juice.

healthline.com - The 8 Best Weight Loss Drinks - Healthline

Green tea is often associated with health, and for good reason.

Not only is it packed with beneficial antioxidants and other powerful nutrients, it’s also one of the most effective drinks for weight loss. Drinking green tea has been shown to decrease body weight and body fat in several studies. A review of 14 studies found that people who drank high-concentration green tea for 12 weeks lost an average of 0.44 to 7.7 pounds (0.2 to 3.5 kg) more than those who did not drink green tea ( 1 ). It should be noted that this benefit is linked to green tea preparations that contain high amounts of catechins, antioxidants that may increase fat burning and boost metabolism ( 2 ). Matcha is a type of green tea that contains a higher amount of catechins than loose leaf green tea, which makes it a good choice for weight loss ( 3 ). One study found that women who consumed 3 grams of matcha per day experienced greater fat burning during exercise compared to women who did not drink matcha ( 4 ). Plus, green tea contains caffeine, which can help promote weight loss by boosting energy levels and improving performance while exercising ( 5 , 6 ). What’s more, people who drink green tea tend to have lower blood pressure and a lower risk of developing diseases such as heart disease, certain cancers and diabetes ( 6 ). Summary Drinking green tea may help you lose weight by boosting metabolism and encouraging fat loss.

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