“Fart walks” have become a cultural phenomenon, after a woman named Mairlyn Smith posted online a now-viral video about how she and her husband go on walks about 60 minutes after dinner and release their gas.

Smith, known on TikTok as @mairlynthequeenoffibre and @mairlynsmith on Instagram, has since appeared on myriad TV and press interviews extolling the benefits of a fart walk. Countless TikTok and Instagram users and have now shared their own experiences of feeling better after taking up the #fartwalk habit.

So what’s the evidence behind the fart walk? And what’s the best way to do it?

Exercise can help get the gas out

We know exercise can help relieve bloating by getting gas moving and out of our bodies.

Researchers from Barcelona, Spain in 2006 asked eight patients complaining of bloating, seven of whom had irritable bowel syndrome, to avoid “gassy” foods such as beans for two days and to fast for eight hours before their study.

Each patient was asked to sit in an armchair, in order to avoid any effects of body position on the movement of gas. Gas was pumped directly into their small bowel via a thin plastic tube that went down their mouth, and the gas expelled from the body was collected into a bag via a tube placed in the rectum. This way, the researchers could determine how much gas was retained in the gut.

The patients were then asked to pedal on a modified exercise bike while remaining seated in their armchairs.

The researchers found that much less gas was retained in the patients’ gut when they exercised. They determined exercise probably helped the movement and release of intestinal gas.

Walking may have another bonus; it may trigger a nerve reflex that helps propel foods and gas contents through the gut.

Walking can also increase internal abdominal pressure as you use your abdominal muscles to stay upright and balance as you walk. This pressure on the colon helps to push intestinal gas out.

Proper fart walk technique

One study from Iran studied the effects of walking in 94 individuals with bloating.

They asked participants to carry out ten to 15 minutes of slow walking (about 1,000 steps) after eating lunch and dinner. They filled out gut symptom questionnaires before starting the program and again at the end of the four week program.

The researchers found walking after meals resulted in improvements to gut symptoms such as belching, farting, bloating and abdominal discomfort.

Now for the crucial part: in the Iranian study, there was a particular way in which participants were advised to walk. They were asked to clasp hands together behind their back and to flex their neck forward.

The clasped hands posture leads to more internal abdominal pressure and therefore more gentle squeezing out of gas from the colon. The flexed neck posture decreases the swallowing of air during walking.

This therefore is the proper fart walk technique, based on science.

What about constipation?

A fart walk can help with constipation.

One study involved middle aged inactive patients with chronic constipation, who did a 12 week program of brisk walking at least 30 minutes a day – combined with 11 minutes of strength and flexibility exercises.

This program, the researchers found, improved constipation symptoms through reduced straining, less hard stools and more complete evacuation.

It also appears that the more you walk the better the benefits for gut symptoms.

In patients with irritable bowel syndrome, one study increasing the daily step count to 9,500 steps from 4,000 steps led to a 50% reduction in the severity of their symptoms.

And just 30 minutes of a fart walk has been shown to improve blood sugar levels after eating.

What if I can’t get outside the house?

If getting outside the house after dinner is impossible, could you try walking slowly on a treadmill or around the house for 1,000 steps?

If not, perhaps you could borrow an idea from the Barcelona research: sit back in an armchair and pedal using a modified exercise bike. Any type of exercise is better than none.

Whatever you do, don’t be a couch potato! Research has found more leisure screen time is linked to a greater risk of developing gut diseases.

We also know physical inactivity during leisure time and eating irregular meals are linked to a higher risk of abdominal pain, bloating and altered bowel motions.

Try the fart walk today

It may not be for everyone but this simple physical activity does have good evidence behind it. A fart walk can improve common symptoms such as bloating, abdominal discomfort and constipation.

It can even help lower blood sugar levels after eating.

Will you be trying a fart walk today?

Vincent Ho, Associate Professor and clinical academic gastroenterologist, Western Sydney University

This article is republished from The Conversation under a Creative Commons license. Read the original article.

Throughout recorded history, our hair and nails played an important role in signifying who we are and our social status. You could say, they separate the caveman from businessman.

It was no surprise then that many of us found a new level of appreciation for our hairdressers and nail artists during the COVID lockdowns. Even Taylor Swift reported she cut her own hair during lockdown.

So, what would happen if all this hair and nail grooming got too much for us and we decided to give it all up. Would our hair and nails just keep on growing?

The answer is yes. The hair on our head grows, on average, 1 centimeter per month, while our fingernails grow an average of just over 3 millimetres.

When left unchecked, our hair and nails can grow to impressive lengths. Aliia Nasyrova, known as the Ukrainian Rapunzel, holds the world record for the longest locks on a living woman, which measure an impressive 257.33 cm.

When it comes to record-breaking fingernails, Diana Armstrong from the United States holds that record at 1,306.58 cm.

Most of us, however, get regular haircuts and trim our nails – some with greater frequency than others. So why do some people’s hair and nails grow more quickly?

Remind me, what are they made out of?

Hair and nails are made mostly from keratin. Both grow from matrix cells below the skin and grow through different patterns of cell division.

Nails grow steadily from the matrix cells, which sit under the skin at the base of the nail. These cells divide, pushing the older cells forward. As they grow, the new cells slide along the nail bed – the flat area under the fingernail which looks pink because of its rich blood supply.

A hair also starts growing from the matrix cells, eventually forming the visible part of the hair – the shaft. The hair shaft grows from a root that sits under the skin and is wrapped in a sac known as the hair follicle.

This sac has a nerve supply (which is why it hurts to pull out a hair), oil-producing glands that lubricate the hair and a tiny muscle that makes your hair stand up when it’s cold.

At the follicle’s base is the hair bulb, which contains the all-important hair papilla that supplies blood to the follicle.

Matrix cells near the papilla divide to produce new hair cells, which then harden and form the hair shaft. As the new hair cells are made, the hair is pushed up above the skin and the hair grows.

But the papilla also plays an integral part in regulating hair growth cycles, as it sends signals to the stem cells to move to the base of the follicle and form a hair matrix. Matrix cells then get signals to divide and start a new growth phase.

Unlike nails, our hair grows in cycles

Scientists have identified four phases of hair growth, the:

1. anagen or growth phase, which lasts between two and eight years
2. catagen or transition phase, when growth slows down, lasting around two weeks
3. telogen or resting phase, when there is no growth at all. This usually lasts two to three months
4. exogen or shedding phase, when the hair falls out and is replaced by the new hair growing from the same follicle. This starts the process all over again.

Each follicle goes through this cycle 10–30 times in its lifespan.

If all of our hair follicles grew at the same rate and entered the same phases simultaneously, there would be times when we would all be bald. That doesn’t usually happen: at any given time, only one in ten hairs is in the resting phase.

While we lose about 100–150 hairs daily, the average person has 100,000 hairs on their head, so we barely notice this natural shedding.

So what affects the speed of growth?

Genetics is the most significant factor. While hair growth rates vary between individuals, they tend to be consistent among family members.

Nails are also influenced by genetics, as siblings, especially identical twins, tend to have similar nail growth rates.

But there are also other influences.

Age makes a difference to hair and nail growth, even in healthy people. Younger people generally have faster growth rates because of the slowing metabolism and cell division that comes with ageing.

Hormonal changes can have an impact. Pregnancy often accelerates hair and nail growth rates, while menopause and high levels of the stress hormone cortisol can slow growth rates.

Nutrition also changes hair and nail strength and growth rate. While hair and nails are made mostly of keratin, they also contain water, fats and various minerals. As hair and nails keep growing, these minerals need to be replaced.

That’s why a balanced diet that includes sufficient nutrients to support your hair and nails is essential for maintaining their health.

Nutrient deficiencies may contribute to hair loss and nail breakage by disrupting their growth cycle or weakening their structure. Iron and zinc deficiencies, for example, have both been linked to hair loss and brittle nails.

This may explain why thick hair and strong, well-groomed nails have long been associated with perception of good health and high status.

However, not all perceptions are true.

No, hair and nails don’t grow after death

A persistent myth that may relate to the legends of vampires is that hair and nails continue to grow after we die.

In reality, they only appear to do so. As the body dehydrates after death, the skin shrinks, making hair and nails seem longer.

Morticians are well aware of this phenomenon and some inject tissue filler into the deceased’s fingertips to minimise this effect.

So, it seems that living or dead, there is no escape from the never-ending task of caring for our hair and nails.

Michelle Moscova, Adjunct Associate Professor, Anatomy, UNSW Sydney

This article is republished from The Conversation under a Creative Commons license. Read the original article.