Whether you're a dude in sweat socks and sneakers or a lady in dainty ballet flats, once you take those shoes off -- ew. The whole room can smell your Kimmy Gibbler-style stinky feet. On this morning's TODAY, Women's Health magazine contributor Dr. Keri Peterson answered viewers' most embarrassing health questions -- including how to pretty up those foul feet.

"Smelly feet are from bacteria that thrive when your feet sweat," Peterson explains to Savannah Guthrie. "So the goal to get rid of it is either to decrease the sweat or decrease the bacteria."

To decrease bacteria, wash your feet with anti-bacterial soap, and try applying baking soda inthe shoe or sock. To decrease sweat, wear socks that have breathable material -- for instance, cotton instead of nylon. Wear shoes that are well-ventilated, and give each pair some time to dry out before you jam your feet back in there again. You could even try applying an antiperspirant -- yep, like the one for your underarms -- to the soles of your feet.

Got an embarrassing health question you're too sheepish to ask? Submit it here, and Peterson may answer your query on an upcoming TODAY segment.

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We ask a lot of weird questions here at The Body Odd. But so do you! Here's our answer to one of your latest queries. Got an inquiring mind? Head over to our Facebook page and ask us your oddest health, medical or human behavior question. We may answer it in an upcoming post.

Becky Coombs asks: Why/how does deja vu happen?

Maybe it's a short circuit in the brain. Or bit of far-off memory slipping into the present. Or perhaps it's both those things and something more.

Whatever the case, deja vu isn't just a strange but irrelevant fact of life (like, say, Snooki).  Better understanding of deja vu will almost certainly lead to better understanding of how our brains work.

So what is deja vu in the first place? "It's the feeling that you have done this exact same thing before -- been to this place or performed this particular activity -- when you know that you haven't," says Colorado State University's Anne M. Cleary, a leading deja vu specialist. "Not everybody experiences it, but the majority of people do."

Young people, from the teenage years through the mid-20s,  experience deja vu the most, says Akira O'Connor, who studies deja vu at the University of St. Andrews in Scotland. Tired people also get it more often, as do those who travel a lot. Even though they have many more years stored in their memory banks, older people aren't as prone to deja vu.

When most of us feel deja vu, we think it's a little odd or even meaningful -- maybe a past life is coming through! -- and go on with our day. Others aren't so fortunate. Some people suffer from deja vecu, a feeling of having already lived.

"It sounds kooky and fun, like a 'Groundhog Day'-type experience, but in reality it's extremely unsettling and drastically changes people's behavior," O'Connor says. "People find that they experience it most strongly for novel experiences. As they find the experience unsettling, they tend to avoid novelty altogether, with the sad consequence that they can withdraw into a world of true familiarity, watching reruns of movies and TV shows over and over again because that brings them the least distress."

There's no good treatment for people with this condition, which is often related to the memory problems of aging. No wonder: there's no clear understanding of what causes deja vu and related feelings in the first place. 

Colorado State University's Cleary said some possible causes of deja vu include errors in the way the brain processes the world around us or "a brief neurological dysfunction, such as spontaneous brain activity that triggers an inappropriate sense of familiarity, or a brief minor seizure." It's possible that multiple causes are at work.

For now, researchers are finding new ways to analyze deja vu. Cleary is using virtual reality to see if they can trigger it in people and figure out exactly what in a "scene" makes it happen. (Vision isn't necessary, though. Blind people have deja vu too.)

"Researchers need to figure out what causes the disconnect between feeling that something is familiar, and knowing that it can't be," Scotland's O'Connor says. "I hope that in my lifetime we figure what parts of the brain are associated with 'feeling' familiarity and what parts are associated with 'knowing' that something should or should not evoke memories."

Just remember this: Maybe it's a short circuit in the brain. Or bit of memory slipping into the present. Or perhaps it's both those things and something more. (No, you're not having deja vu. You already read that. Or did you?)

Leave a comment telling us about the weirdest or most memorable time you experienced deja vu. We may use your answer in an upcoming post.

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We're sure you never drool in your sleep. But if your ... friend ... ever does, Women's Health magazine contributor Dr. Keri Peterson has some helpful advice. Peterson, a board-certified internist, appeared on TODAY this morning to tell us some reasons why this might be happening, and what you can do to knock it off.

"When you sleep, your muscles relax, your mouth falls open, and if you're lying on your side, it's gonna leak out," explains Peterson, adding this fun fact: We make a liter of saliva a day.

"Also, if you have sinus problems, or allergies, and you tend to mouth-breathe, you're gonna be more likely to have this happen to you," she continues.

To keep yourself from drooling all over your pillow -- try sleeping on your back, Peterson advises. Watch the video for more on this, plus answers to more embarrassing health questions.

Got an embarrassing health question of your own? Ask us in a comment -- a writer for The Body Odd may answer it in an upcoming post.

Follow msnbc.com health writer on Twitter: @melissadahl.

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It's Friday, which means two things: We all have that Rebecca Black song in our heads, and it's time for us to answer a reader question. Today, we're tackling a beauty query from our Facebook pal Suzanne Pyles:

But we think this question brings up another question: Why do overplucked hairs stop growing back, anyway?

"Overplucking of the brows can lead to a diminution in the size of the hair follicle, thereby making the new growing hairs smaller and finer as well. This happens when people wax a lot," explains Dr. Carolyn Jacob, a Chicago dermatologist. "Older women tend to lose eyebrow hairs, too, so you don't want to make your brows thin when you are younger. It doesn't look right, and you wont have much, if anything, to work with when you're older."

Onto the real question here: Can the eyebrow hairs you accidentally made disappear ever grow back?

"Sometimes, if the plucking is too forceful or if there is chronic irritation or inflammation, this can lead to damage or scarring of the hair follicle, thus a new hair does not grow," says Dr. Paradi Mirmirani, a dermatologist practicing in Vallejo, Calif. "This is a rare occurence, but once the follicle is damaged it is permanent.  There is no treatment other than hair transplantation that would lead to successful regrowth of another hair shaft."

Short of hair transplantation, you could always consider permanent makeup, although we hear that doesn't always work out so well.

Got a weird health question you're itching for us to answer? Ask away -- leave a comment here, or find us on Facebook or Twitter.

Follow health editor Melissa Dahl on Twitter: @melissadahl.

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Last week, we outsourced part of our job to our Facebook fans, letting you guys ask the odd health questions this time. This week, we investigated the answers to some of our favorite wonderfully weird queries -- on deja vu, seemingly random memories, hiccups and sneezes. Here's what we found. 

The answer: First of all -- it's not just you. "In recent community studies, approximately 70 percent of the individuals reported some déjà vu experiences," explains Dr. Orly Avitzur, a New York state neurologist. On average, it happens about once a year in healthy individuals -- but it appears to be more frequent when we're tired or stressed. But it can also be pathological, often seen in patients with epilepsy. 

"The temporal lobe, particularly the region of the hippocampus, has been linked to this phenomenon," Avitzur says. "Neurons there store new experiences in a 'mental map' and some scientists have theorized that when very similar events overlap, déjà vu occurs."

Hmm. We feel like we've heard that explanation before.

The answer: We gave this one to Avitzur to tackle, too. "Detailed memories for episodes from our past can be triggered when we’re suddenly exposed to a stimulus that was present during the original event," she explains. "When you’re working at your desk and you experience a memory of a place or person from your past, you may not be consciously aware that an auditory stimulus (like music), or visual stimulus from your computer screen sparked the memory."

But these associations your brain is making might be so subtle that they appear "random" to you. Here's what's happening inside your brain: "Results from functional MRI studies and neuropsychological testing suggest that the prefrontal cortex area of the brain is responsible for episodic retrieval of memories," Avitzur says.

You know, that reminds me of something ... 

The answer: We asked Dr. Peter Abramson, an ear, nose and throat doctor from Atlanta to explain why some of us seem to be more hiccups-prone than others. "Hiccups, essentially, can be caused by a number of different things -- it could be anything from a (gastro-intestinal) issue from having an over-distended stomach to having irritation of the nerves that control the diaphragm," he explains.

People who often get the hiccups may have unusually sensitive nerves that control the diaphragm, Abramson says. Another theory: If you eat too much, and your stomach is often distended, that can trigger the hiccups. A brain tumor is another scary, but unlikely, potential cause of frequent hiccups. 

The answer: We picked Abramson's brain again for this one. Some sneezes are initiated by sensory nerves in the nose, and pressing on the upper lip may help distract those nerves, he explains. "What it may do is decrese the brain’s ability to sense that there’s an irritant in the nose and decrease their chance of having another (sneeze)," Abramson says. 

Got any more weird wonderings about the human body? Ask away -- either here, on our Facebook page, or ask us on Twitter (@bodyodd) with the hashtag #inquiringminds. (And, hey -- keep it SFW, please.) We'll be back next Friday with more answers to your questions.

Follow Melissa Dahl on Twitter: @melissadahl

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