Health24.com | Please tell me it’s normal to have stringy poop

Be real for a second: You probably inspect your poop so often you could do a PowerPoint presentation on your daily BMs. (No shame, really! Examine that poo all you want.)

Most of the time, whatever’s in the toilet looks pretty standard: Brown and log-like. So when something’s very clearly off ­– like if your poop is pencil-thin and kind of stringy-looking – it’s alarming.

First: Take a deep breath – stringy poop is likely not as bad as you think. Yes, even if your poop looks like you ran it through a Play-Doh pasta maker.

Okay, why does my poop look stringy?

Let’s get something out of the way first: You’ve probably heard that stringy poop can be a sign of colorectal cancer and, yes, that’s true, says Dr Kyle Staller, a gastroenterologist at Massachusetts General Hospital. But it’s way more common that stringy poop is caused by something much more innocent, he says.

Namely, it could be that your poop is just moving through your colon really fast and creating a thin, stringy appearance in the process. That could be due to something as simple as a change in your diet, says Dr Benjamin Lebwohl, a gastroenterologist at NewYork-Presbyterian/Columbia University Medical Center.

“Aside from diet, other factors that can affect the frequency of bowel movements include a change in physical activity, fluid intake, travel, stress or other disruptions to one’s routine,” he says. “Typically, moving around less, sitting for prolonged periods and being relatively dehydrated can slow the bowels down, and this can result in a change in shape.”

Read more: 6 reasons why you’re pooping a whole lot more than usual

Should I be worried about my stringy poop?

Not really, says Dr Anton Bilchik, professor of surgery and chief of gastrointestinal research at John Wayne Cancer Institute at Providence Saint John’s Health Center in Santa Monica, California. “This can be a normal type of stool,” he says. “Some people have thin and stringy stools; some people have larger bowel movements.”

That said, you should be a little concerned if you’ve been having big, bulky poop and then suddenly you’re having thin, stringy poop that won’t quit, says Dr Ashkan Farhadi, a gastroenterologist at MemorialCare Orange Coast Medical Center and director of MemorialCare Medical Group’s Digestive Disease Project in Fountain Valley, California. That’s especially true if it also comes along with bloody poop and abdominal pain, Dr Staller says, who recommends seeing your doctor ASAP, if that’s the case.

Read more: 8 natural laxatives that actually work to relieve constipation

How can I take care of my stringy poop situation?

If you’re just having stringy poop and you have no other symptoms, it’s a good idea to try to bulk up the fibre in your diet and see where that gets you, Dr Staller says. That could mean eating more high-fibre foods (like whole grains and beans) or taking a supplement.

But if you’re having other symptoms along with your stringy poop, or it came out of nowhere and won’t stop, it’s a good idea to check in with a doctor, just in case. Your doctor will typically examine you and, if they think it’s necessary, may order a colonoscopy, Dr Lebwohl says.

One thing to keep in mind (and put you at ease), “When we do a colonoscopy to evaluate long stringy bowel movements, the great majority of the time we find no structural abnormality and no cancer,” he says.

Again, if you’re just having stringy poop here and there, don’t panic. You probably ate something funky or you’ve changed up how much you’re drinking – and it’s totally normal.

This article was originally published on www.womenshealthmag.com

Image credit: iStock 

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Health24.com | Physical therapy for erectile dysfunction? Yes, it’s a thing.

Due to society’s expectations and rigid gender performance standards, erectile dysfunction (ED) can be a daunting prospect for men.

You might think the problem is squarely on something intrinsically wrong with your penis – so you might be surprised to learn that your struggles might be due to an underdeveloped set of pelvic floor muscles.

Read more: Can watching too much porn give you erectile dysfunction?

For most men, the pelvic floor muscles aren’t exactly their priority when hitting the gym for a full body workout – but they should be. These muscles are critical for many essential daily functions, both in the bathroom and in the bedroom.

Unfortunately, it’s not commonplace for men to seek out help to strengthen their pelvic muscles.

When men hurt themselves playing sports or otherwise, they’re likely not going to be embarrassed to seek out an orthopaedist or physical therapist (PT) for help – but when it comes to an injury or problem with their muscles “down there”, men tend to be a little more… private.

Despite common belief and focus on keeping up macho appearances, pelvic floor (PF) dysfunction isn’t just a woman problem. Leakage with squats, pain during or after sex, and bowel or bladder incontinence are all signs of PF muscle dysfunction. Let it be known that penises have muscles, too. And sometimes, like any other muscle in your body, they can be dysfunctional – so you should see a PT about those muscles, too.

Facing real problems

ED is a common and growing problem facing thousands of men in the US (pun intended). According to the 2010 US Census Bureau, more than 12 million men between the ages of 40 and 79 experience ED.

More recent research suggests that as much as a quarter of men under the age of 40 do, too. Despite its prevalence, most men treat the same way: Using medication. But what if I told you that you could see a physical therapist for your ED to solve the problem naturally? According to research, you can.

Erectile dysfunction is defined as the inability to achieve or maintain an erection. There can be many causes of ED ranging from the emotional and psychological to the physical or neurological. “Pelvic floor physical therapy can address the muscular and nerve function required to achieve and maintain an erection,” pelvic floor specialised doctor of physical therapy Dr Erin Weber told Men’s Health. Specifically, targeted PT can help a man strengthen and engage his ischiocavernosus muscle, which is responsible for building and keeping penile rigidity. That engagement can be honed through exercises like kegels, which have grown more common among women but are woefully underperformed by men.

Just like any other muscle, the pelvic floor muscles can be addressed with rehabilitation. A proper strengthening routine can target weakness – specifically, trigger points can be released where there is increased tension, restoring the correct length-tension relationship and creating more complete and stronger muscle contractions, according to Dr Weber.

But before you start getting too creative with a DIY strengthening and massage routine, you’ll want a qualified specialist to assess and identify the source of the problem before determining the most appropriate treatment plan.

Read more: This new gel could help you get an erection in just 5 minutes

What goes into treatment

You’d be surprised what PF PT might entail. “Pelvic floor PT is much more than range of motion exercises, soft tissue mobilisation and home exercises,” Dr Francesca Warner, a doctor of physical therapy who specialises in treating male and female pelvic health, told Men’s Health.

A big focus of her treatments is on patient education and lifestyle adjustments. In particular, Dr Warner highlighted the importance of breathing and relaxation techniques. “Your diaphragm and your pelvic floor muscles are connected, therefore proper breathing is paramount.”

Additionally, stress can exacerbate pelvic pain. Dr Warner noted that many people hold stress in their pelvis, just like others do in their neck and shoulders. Patient education on avoiding straining when going to the bathroom, not clenching muscles throughout the day and global relaxation strategies, such as meditation and mindfulness, can be a large part of her treatments.

Read more: How to maintain your erection

So why aren’t more men seeking physical therapy for their ED? According to Dr Weber, who treats mostly women, men aren’t the only ones lacking knowledge about the muscle group. “Women are just starting to talk (whisper) about their pelvic floors, but only because they go through childbirth.”

Dr Warner believes the main reason men don’t seek pelvic floor physical therapy is because they don’t know it exists. “While there are a handful of excellent urologists, gastroenterologists, orthopaedists and pelvic pain specialists who refer patients to PF physical therapy, unfortunately not all doctors are aware of this specialisation (especially when it comes to men),” she said.

Dr Warner believes part of the issue has to do with common misconceptions. She noted that men are often told ED is related to anxiety. When all the diagnostic testing and urine cultures are negative, they are treated with anti-anxiety medications before their pelvic floor muscles are thoroughly assessed. This can be particularly frustrating for men who begin to think “it’s all in their head”, when there is undoubtedly a muscular component to their pain or discomfort.

Not just a ‘woman thing’

Not convinced yet?

Know this: A pelvic floor exam by a physical therapist may involve both external and internal soft tissue, neurological, strength and range of motion assessments.

Read more: How your big toe can signal problems with your erection

By internal, this usually means very gentle assessment of the pelvic floor muscles via the rectum – so yes, you will need to be ready for the rubber gloves to go on.

PF PTs know this may be uncharted territory for many men, so you should also know that internal exams usually don’t happen on the initial visit. Such procedures are always discussed prior to the exam and are only performed when a medical history and complete examination indicate that it is appropriate.

“I often hear ‘how come it took seven different doctors to get me here?’ or ‘I wish I had known about this three, five, 15 years ago,’” said Dr Warner. Above all, she wants men to know that they are not alone and there is help out there. “I am frequently asked ‘Have you ever treated this before?’ My patients seem shocked to hear that, not only are they not my first patient suffering from these symptoms, but they are usually one of three I’ve treated that day.”

Hopefully the stigma of pelvic floor PT being just a “woman thing” will change as men learn more about the prevalence of male pelvic floor dysfunction. Pelvic floor PT can help, so remember: Your struggles might not be in your head.

This article was originally published on www.mh.co.za

Image credit: iStock

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Health24.com | Hip flexor pain is basically the worst – but you can fix it

Nothing makes you feel like you’re approximately 97 years old more than thinking, “My hips are killing me!” – am I right?

But that tight, pinching sensation where the top of your thighs meet your hips is definitely not just a nonagenarian thing.

If your hips are killing you, you probably spend a lot of time sitting – in the car, at work, on that spinning seat – which puts your hips in near-constant “flexion”, says Cori Lefkowith, NASM-certified personal trainer and owner of Redefining Strength in Orange County, California. Even running involves a repetitive flexion movement that can cause pain.

Keeping your hips in flexion pretty much all the time causes your hip flexors (you know, the muscles that stabilise the joint and allow your body to hinge) to become “overactive” –  which is basically a fancy way of saying incredibly tight.

And that’s probably what’s causing your hip pain, and maybe even your lower back or knee pain. It could also be the reason why your hips hurt more than your abs during your core workouts. Annoying, right?

How can you tell if your hip flexors are overactive?

The most obvious sign: Hip pain. But yeah, tight hip flexors can also cause lower back pain.

“There are two main hip flexors: the psoas and the iliacus,” says Lefkowith. “The psoas connects into your spine, so if that hip flexor muscle gets shortened, it’s sort of pulling the hip towards the spine and the spine towards the hip.” Ouch?

This also interferes with abs exercises, she explains. Tight hip flexors throw off your alignment, and as a result, your hips end up doing more work than they’re supposed to when you do, say, sit-ups or leg lowers.

Shortened hip flexors also overstretch the glutes and hamstrings, explains Lefkowith. This makes the glutes and hammies harder to activate when you want them to, whether you’re going for a run or doing squats. Plus, when you run the front side of your body will be working harder than the back side, causing tons of stress on your knees.

Read more: Tight hips? Take this mobility test!

How can you prevent hip flexor pain?

The first thing you can do to prevent hip flexor issues when you’re working out is to focus on the mind-muscle connection, says Lefkowith. “A lot of time, we push through pain and let muscles compensate without being aware of what muscles are supposed to be working,” she says.

So if you’re doing abs exercises and you feel like your hip flexors are putting in more work, refocus and dial in on the muscles you’re trying to target. It might sound trite to just “think” about a muscle working as you’re doing an exercise (for example, thinking about your abs contracting as you do a sit-up), but it might actually prevent you from mindlessly grinding out reps with poor form.

The second key is to do some prep work before diving into a workout, says Lefkowith. She takes a three-step approach: Foam rolling, dynamic stretching and activation exercises for other muscle groups.

Foam rolling overactive hip flexors with a roller or a lacrosse ball before a workout can help chill them out. “Foam rolling helps relax and release the muscle and it can help inhibit muscles that might be overactive,” Lefkowith explains. She notes that instead of just rolling quickly, hold still and breathe into any tight areas you come across.

Stretching is your next move, but not just any stretches. “Before your workout, you want to go for dynamic stretches, or stretches that put the joint through a full range of motion,” says Lefkowith. Moves like squats and lunges will get your muscles fired up (especially if you focus on squeezing your butt at the top of those squats), says Lefkowith.

Read more: A physio’s guide to foam rolling the right way, plus which type of roller to use

What are the best exercises for hip flexor pain?

The best exercises for hip flexor pain are really more geared towards getting the muscles you want to work engaged.

A basic bodyweight glute bridge is one of Lefkowith’s favorites. Want to try it? Lie on the ground with your knees bent and your feet flat on the floor, and push your hips up toward the sky, squeezing your glutes at the top. This will not only help get your glutes in the game, but it also gives your hip flexors a chance to stretch out.

You can also give your hip flexors some love when you’re not working out. “Just do some glute squeezes when you’re standing around,” says Lefkowith.

Ultimately, just giving your hip flexors a break from all that flexion can make a big difference, too. “The more you can move throughout the day, the better off you’re going to be,” says Lefkowith. “Get up, move around, take a doorway stretch, do whatever you can.” (In fact, that’s just good advice in general.)

This article was originally published on www.womenshealthmag.com

Image credit: iStock 

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Health24.com | 5 ways your baby benefits from breastfeeding

Breast milk offers a complete balanced meal as it contains proteins, fats, carbohydrates, vitamins minerals and all the water your baby needs. In addition, breast milk contains antibodies that are not found in any infant formula, food or drink. These antibodies are biological compounds, produced by the mother’s immune system, which means they cannot be artificially made. 

“Breast milk is referred to by some as ‘Liquid Gold’ for this reason,” Catherine Pereira Association for Dietetics in South Africa (ADSA) spokesperson, registered dietitian and lecturer at the University of the Western Cape, told Health24. “It is definitely the ‘Gold Standard’ for feeding babies and young children.” 

In fact, breastfeeding can be life-saving too, and according to a journal in The Lancet, “Improved breastfeeding practices would prevent 823 000 annual deaths in children younger than five years of age.” 

Optimal infant and young child feeding is defined by the World Health Organisation (WHO) and UNICEF as “the early initiation of breastfeeding (within one hour of birth); exclusive breastfeeding until six months; and then the introduction of nutritionally-adequate and safe complementary (solid) foods at six months together with continued breastfeeding up to two years of age or beyond”.

“There is more and more research being done, and new components of breast milk are being discovered that just continue to prove its benefits in terms of health and development, as well as the prevention of disease and death for the baby. However, the benefits don’t only last while the child is being breastfed but is has been shown that the child later on in life, and that same baby as an adult will have a reduced risk of developing non-communicable diseases and obesity, for example,” says Pereira.

5 benefits of breastfeeding

While there are health benefits to a breastfeeding mom, there are also numerous benefits to the baby. Pereira shares these five: 

1. Breast milk is nutritionally complete, which means it contains all the nutrients and water a baby needs for their first six months of life. “Breast milk can never be under or over diluted,” says Pereira.

2. Breastfeeding also has psychological advantages. “It allows for increased bonding between the mother and baby,” says Pereira. “The infant feels safe, warm and protected because there is more skin-to-skin contact between the mother and baby during breastfeeding.” Skin-to-skin contact has many advantages for the mother and baby. According to UNICEF, it calms and relaxes both the mother and baby; it helps regulate the baby’s heart rate and breathing; and it helps the baby to adapt to life outside the womb. Breastfeeding also stimulates the release of hormones that support breastfeeding.

mother breastfeeding baby

“For me, the benefit to my emotional health far outweighed the physical health benefits. Being able to bond with all my children during the time I breastfed was special. I also have a family history of breast cancer and breastfeeding has been shown to lower one’s risk of breast cancer,” Maryke Gallagher, mother of three, ADSA spokesperson and registered dietitian, previously told Health24. 

3. “Breast milk is more economical than formula, which means the mother would have more money available to pay for all the other costs associated with having a newborn baby, such as nappies and clothes,” says Pereira. She adds that if mothers or caregivers cannot afford sufficient infant formula, they will often over-dilute the formula to help it last longer, which means it contains fewer nutrients and can cause malnutrition. Other sub-optimal feeding practices include giving porridge or tea too early. “Breastfeeding therefore assists to prevent malnutrition.”

4. Babies are seldom allergic to their own mother’s milk. In addition, breastfed babies are less likely to develop food allergies later in life.

5. Breastfed babies get sick less often and have a reduced risk of developing infections due to the antibodies in breast milk. “Unfortunately infant formula carries a high risk of becoming contaminated with bacteria, especially when prepared in conditions where safe water and hygiene are not guaranteed,” says Pereira.  

Did you know?

If mothers start to introduce infant formula or other foods and drinks to the baby too early while breastfeeding, their breast milk production will decrease. This is because the baby would be feeding less often at the breast if they were provided with foods or drinks other than breast milk.

Breast-milk production operates on a supply and demand basis. Each time a baby breastfeeds, specific reflexes in the mother’s body ensure that certain hormones are produced which in turn stimulate the production of milk for the next feed. Therefore, the more often a baby feeds, the more milk will be produced. Babies need to feed often because their tummies are small and they are growing at a rapid rate, so they very quickly use up all of the energy and nutrients that they consume.

Image credit: iStock 

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Sniffing out error in detection dog data

A new study in the journal Scientific Reports gets to the bottom of it: Why do dogs that are trained to locate poop sometimes find the wrong kind of poop?

It happens anywhere from 4 percent to 45 percent of the time, said Karen DeMatteo, a biologist in Arts & Sciences at Washington University in St. Louis. Her new research confirms that there are three viable, alternative explanations beyond errors in handler or dog training that can explain the collection of non-target scats with detection dogs in some ecosystems.

Detection dogs are trained to use scent, not their eyes, to locate specific kinds of scat. They’re useful partners in conservation projects as an alternative to camera photo traps or other more invasive means of identifying which individual animals are present in an area.

And while finding the wrong kind of poop doesn’t ultimately muck up research results — researchers who use scat to track animals usually use DNA tests to confirm the identity of target and non-target evacuators — collecting and testing false positives costs a project time and resources.

“To date, when non-target samples are found in detection dog studies, it is assumed it may be due to errors in detection dog or handler training; however, our study determined that this is not always the case,” DeMatteo said. “Instead, the complexity of ecosystems where a study is conducted can affect the perceived accuracy of detection dog studies because the natural behaviors of non-target species, like coyotes in our study, can alter the genetic profile of target scat, like that from a puma.”

In her own work, DeMatteo has successfully used scat-detection dogs to identify the routes traveled by endangered pumas and other reclusive carnivores along a biologically important corridor in Argentina.

Detection dogs are great at determining the presence of specific animals because they can find droppings hidden in grass, droppings that have been rained on and disintegrated into the mud — or even droppings that have been eaten and then recycled.

Yes, that’s right, and it’s a normal part of life for many animals, DeMatteo said.

“Humans have a natural aversion to coprophagy, which is reflected in the visual horror on an owner’s face when they see their dog gobble down their own scat or the scat of another dog or cat,” DeMatteo said. “Once this shock subsides, the owner typically worries that the scat will cause health problems or there is something psychologically wrong with their four-legged friend.”

“While the reasons underlying coprophagy in domestic dogs are still fuzzy, it is known in wild canids that coprophagy is natural and is often associated with territoriality or nutritional benefits,” she said. “So while the finding that coyotes will consume puma scat is novel and has various ecological implications, coprophagy occurs naturally under a variety of circumstances.”

The tendency of one animal to eat another’s scat is one of three behaviors that might alter the type of scat, or the state of the scat, that a detector dog might encounter, and thus affect the perceived accuracy of the technique.

Researchers also considered how urine-marking by non-target species might affect a detector dog’s ability to locate scat from a species of interest, and also what happens if one animal picks up another’s scat and moves it using its mouth, potentially bringing it into contact with saliva. Field trials were conducted in the St. Louis area and in northwest Nebraska.

The researchers found that each of the proposed behaviors alters the genetic profile of the scat in question, and all were confirmed to play a role in the detection dog indicating on non-target scats.

The pool of conservation-trained detection dogs is constantly growing in number, as are the types of target species and the areas where they are being used, DeMatteo said. One of the continuing questions surrounding their use for these types of projects is how to maintain a high quality standard for training detection dogs and their handlers.

“In reality, the dog is easier to train then the handler, with the latter having a higher chance of introducing error,” DeMatteo said. “Even with these variables, these results are extendable to other dog-handler teams with less experience, as long as consistency is used.”

While this study, “How behavior of nontarget species affects perceived accuracy of scat detection dog surveys,” demonstrates that there are alternative explanations for why dogs sometimes collect non-target samples, it also shines a light on behaviors that humans may not understand — but that could play a role in ecosystem functioning.

“Genetic testing can eliminate these samples and maintain accuracy in the [detection dog-assisted] studies,” DeMatteo said. “However, this non-target interaction with target scat potentially has important implications for other ecological questions, including parasite/disease transmission, zoonotic diseases and general health of wild populations.”

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Viruses under the microscope

Human herpesvirus 6 (HHV-6) infects almost all of the human population, but only very few will show any symptoms during their lifetime: HHV-6 is one of the most widespread viruses among the population. Between 95 and 100 percent of healthy adults have antibodies to the virus which means that they have been infected at some point in the past.

The virus hides in the genomic DNA

There are two types of the virus: HHV-6A and HHV-6B. HHV-6B primarily infects in infancy as sixth disease, whereas HHV-6A infections usually remain asymptomatic. After primary infection, the virus establishes lifelong latency by integrating with the cellular DNA.

The infection is generally harmless. Under certain circumstances, however, the virus can be reactivated — for example, after chlamydia infection, organ transplantation, immunodeficiency or when taking specific drugs.

Trigger of numerous diseases

While HHV-6 was long believed to have no negative impact on human health, scientists today increasingly suspect the virus of causing various diseases such as multiple sclerosis or chronic fatigue syndrome. Recent studies even suggest that HHV-6 might play a role in the pathogenesis of several diseases of the central nervous system such as schizophrenia, bipolar disorder, depression or Alzheimer’s.

Dr. Bhupesh Prusty is responsible for these new insights. The scientist is a team leader at the Department of Microbiology of the University of Würzburg. Prusty has recently discovered a method which for the first time allows reactivation of human herpesvirus to be detected at an early stage.

MicroRNA molecules as markers

“Betaherpesviruses like human herpesvirus 6A, 6B and 7 integrate into subtelomeric ends of human chromosomes and acquire latency. This makes it difficult to recognize the early phase of viral activation based on an analysis of the viral DNA,” Prusty points out the problem. Together with his team, the virologist has now discovered an alternative approach which could be a suitable biomarker for HHV-6 studies.

“We have identified several viral microRNA molecules which are produced both during active infection and viral activation,” Prusty explains. MicroRNAs directly influence cell metabolism. The RNA assures the flow of genetic information from nuclear DNA into the cell where it is “translated” to proteins. The microRNAs have a regulatory function in this process. They can dock to RNA molecules and prevent them from being translated to proteins or initiate the degradation of RNA molecules. Prusty is certain that the detection of these viral microRNAs can serve as an ideal biomarker under clinical conditions.

Biopsies confirm hypothesis

The scientists were able to confirm their hypothesis by studying biopsies of a young woman who had died tragically as a result of drug-induced hypersensitivity syndrome (DRESS), a usually life-threatening condition which results in rash, organ failure and blood count anomalies.

Scientists have suspected for some time that these cases might have been caused by drugs that activate viruses but were unable to provide evidence for this theory. Prusty and his colleagues have now detected traces of HHV-6 DNA in the blood of the deceased — however different concentrations at various stages of the disease. At the time of death, for example, the viral load was very low while the opposite was true for the concentration of microRNA: “All biopsy samples showed a positive signal for this special type of RNA,” Bhupesh Prusty says. This indicates the potential effectiveness of RNA as a viral biomarker for the detection of active viral infection in the body.

With this finding, Prusty and his team have demonstrated for the first time in experiments that some of the prescription drugs have the potential to reactivate HHV-6 with life-threatening consequences. Early detection of viral reactivation may therefore be helpful for further clinical interventions.

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Materials provided by University of Würzburg. Note: Content may be edited for style and length.

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The walking dead: Fossils on the move can distort patterns of mass extinctions

Using the fossil record to accurately estimate the timing and pace of past mass extinctions is no easy task, and a new study highlights how fossil evidence can produce a misleading picture if not interpreted with care.

Florida Museum of Natural History researchers used a series of 130-foot cores drilled from the Po Plain in northeastern Italy to test a thought experiment: Imagine catastrophe strikes the Adriatic Sea, swiftly wiping out modern marine life. Could this hypothetical mass extinction be reconstructed correctly from mollusks — hard-shelled animals such as oysters and mussels — preserved in these cores?

When they examined the cores, the results were “somewhat unnerving,” said Michal Kowalewski, Thompson Chair of Invertebrate Paleontology and the study’s principal investigator.

Paleontologists use the age of a species’ last-known fossil to estimate the timing of extinction. A sudden extinction in the Adriatic Sea today should leave the youngest remains of many mollusk species in the sediments currently forming on the shore and seabed, the “ground zero” of the hypothetical extinction event. But the team found only six of 119 mollusk species — all of which are still alive in the area — at the top of the cores. Instead, the last fossil examples of many of these species often appeared in clusters dotted throughout the cores, suggesting smaller bursts of extinctions over a longer timeline, not a single massive die-off.

Taken at face value, the cores presented a dramatically distorted record of both the timing and tempo of extinction, potentially calling into question some of the methods paleontologists commonly use to interpret past mass extinctions.

“We’re not saying you cannot study mass extinctions. You can,” Kowalewski said. “What we’re saying is that the nature of the geological record is complicated, so it is not trivial to decipher it correctly.”

The results of their analysis did not come as a complete surprise. Computer models designed by paleontologists Steven Holland and Mark Patzkowsky had made similar predictions about how the final resting place of fossils — influenced by species’ ecological preferences, sea level and the makeup of sedimentary basins — could skew patterns of mass extinction.

“This is, to my knowledge, the first empirical study to use the fossil record of living species to test these models rigorously and computationally, rather than theoretically,” Kowalewski said. “We know these species are still living in the Adriatic Sea, so we can be sure that their disappearance from the fossil record does not represent a true extinction.”

Paleontologists have been grappling with the complications of interpreting mass extinctions in the fossil record for several decades. Even the extinction of the dinosaurs was thought to be a gradual, drawn-out process until evidence of a lethal meteor impact emerged in 1980. The problem is a phenomenon known as the Signor-Lipps effect: Because the fossil record is incompletely sampled, the last-known fossil of a given species is almost certainly not the last member of that species, which muddles our ability to date extinctions.

Applied on a larger scale, the Signor-Lipps effect can make abrupt mass extinctions appear gradual. A common approach to correct for this effect is to assume that where fossils end up — and are later discovered — is random, and mathematically adjust estimates of extinction timing accordingly.

But it’s more complicated than that, Kowalewski said, because the fossil record is not created in a random way.

Climatic cycles trigger changes in sea level, causing shorelines to advance or recede and driving changes in environments. A beach may become a mudflat, for example, or a delta can turn into a coastal plain. Shifts in sea level can also affect sedimentation rates — how quickly mud and sand are deposited. These factors can cause last occurrences of fossils to cluster together and influence the probability of finding fossils in a given location.

When the researchers reordered the species represented in the cores from the Po basin according to their last occurrence, they noted several points at which many species appeared to vanish simultaneously. In reality, none of the species had gone extinct. They disappeared from a given site either because local environmental conditions changed, or they were simply missed during the sampling, said Rafal Nawrot, the study’s first author and a postdoctoral researcher in invertebrate paleontology at the Florida Museum.

The cores also depicted a false pattern of extinction, with the majority of offshore species disappearing in a single large “pulse” in the lower part of the cores and shallow-water and brackish species fading out in several smaller pulses. This is because species followed their preferred habitats as they shifted with changing sea levels. Deeper-water dwellers vanished first, as the local river delta started to expand into the Adriatic Sea, replacing open sea with coastal conditions. When shorelines advanced even farther, shallow-water species disappeared as well.

“It’s important to admit that fossil species — just like modern ones — have specific ecological requirements, which sounds obvious but is not always acknowledged,” Nawrot said.

Current methods may give researchers the illusion of precision but fail to account for these factors, which are crucial to correctly interpreting past extinction events, he said.

“If you apply methods based on the assumption of random fossilization, you get a precise estimate, but it may be wrong by millions of years,” Nawrot said. “Not only the pattern of extinction but also the timing of extinction would be wrongly interpreted, so this is quite important.”

While the findings are sobering, the situation is far from hopeless, Kowalewski said. When the team incorporated methods that accounted for species’ ecological preferences, distribution and abundance into the analysis, the results were a much closer approximation of what exists in the basin today.

“This provides us with an initial guideline of how to analyze these types of data to get a more realistic assessment of extinction events,” Kowalewski said. “Certainly, this is a work in progress.”

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Health24.com | Here’s why you should eat breakfast later and dinner earlier

Could the timing of your breakfast and dinner help you eat less and lose body fat?

A small, preliminary study suggests it’s possible.

People cut their daily calorie intake by about 25% when they held off on breakfast for 90 minutes and then had dinner 90 minutes earlier than usual, said senior researcher Jonathan Johnston. He is a reader in chronobiology and integrative physiology with the University of Surrey. 

These people also lost more than twice as much body fat, on average, than a control group with unrestricted eating times, Johnston added.

Meal timing 

“Meal timing is important, in addition to meal content,” Johnston said. “Meal timing research is still quite new, but has a lot of promise to help people improve health with relatively minor changes to behaviour.”

To find out, nine people were recruited to take part in a “time-restricted feeding” pilot study, in which they delayed breakfast and moved up dinner by an hour and a half. During that window, they could eat as often as they liked.

“We deliberately designed our study to have a fairly minor reduction in daily eating duration,” Johnston said.

Another seven people served as a control group by eating meals as they normally would.

Participants provided blood samples and completed diet diaries before and during the study period.

A shorter meal window

After 10 weeks, the people with a shorter meal window had reduced their body fat by about 2%, compared with under 1% lost by those in the control group, the researchers said.

Participants also cut their average energy intake from roughly 2 091 to 1 553 calories per day, the findings showed.

People said they tended to eat less because they had reduced appetite, decreased opportunities to eat, or a cutback in their snacking habits, according to a questionnaire they filled out afterward.

Restricted feeding could lead you to eat food at times best suited for your body’s daily metabolic rhythms, he suggested. It also could be that a shorter meal window increases the length of the daily fasting period.

However, these changes to meal timing may not be sustainable for many.

Fitting in with other people

About 57% of participants told researchers they could not have maintained the new meal times long-term, because they were incompatible with family and social life.

But 43% said they would consider continuing a time-restricted diet if eating times were more flexible.

“This is really important as it emphasizes how important it is for dietary changes to fit with people’s lives in the real world,” Johnston said. “An important question for future research is to evaluate whether a shortened daily duration of feeding will be effective if started at different times of day.”

The study was published in the Journal of Nutritional Science.

Stress hormones can spike

According to an article by Africa Check, 26.8% of South Africans suffer from obesity. This statistic places South Africa at the top of the average Sub-Saharan African ranking. 

The meal schedule in this study is a form of intermittent fasting, said Grace Fjeldberg, a registered dietitian nutritionist with the Mayo Clinic Health System. This “has become an increasingly popular trend to support weight loss,” she said.

“Everyone is looking for quick ways to support weight loss and improve overall health, and eating fewer times throughout the day often produces a deficit in calories and ultimately weight loss,” Fjeldberg explained.

But Fjeldberg warned that quick weight loss through fasting might not necessarily lead to better health and long-term reduced weight.

“Hunger and stress hormones can spike with prolonged periods of fasting, and for some this may mean increased portions in the few meals that are eaten throughout the day and potentially higher calories,” Fjeldberg said.

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Geologists reveal ancient connection between England and France

The British mainland was formed from the collision of not two, but three ancient continental land masses, according to new research.

Scientists have for centuries believed that England, Wales and Scotland were created by the merger of Avalonia and Laurentia more than 400 million years ago.

However, geologists based at the University of Plymouth now believe that a third land mass — Armorica — was also involved in the process.

The findings are published in Nature Communications and follow an extensive study of mineral properties at exposed rock features across Devon and Cornwall.

They reveal a clear boundary running across the two counties, with areas north of it sharing their geological roots with the rest of England and Wales but everything south being geologically linked to France and mainland Europe.

Among other things, scientists believe the research explains the abundance of tin and tungsten in the far South West of England — metals also found in Brittany and other areas of mainland Europe, but not so evident in the rest of the UK.

The research’s lead author, Lecturer in Igneous Petrology Dr Arjan Dijkstra, said: “This is a completely new way of thinking about how Britain was formed. It has always been presumed that the border of Avalonia and Armorica was beneath what would seem to be the natural boundary of the English Channel. But our findings suggest that although there is no physical line on the surface, there is a clear geological boundary which separates Cornwall and south Devon from the rest of the UK.”

For the research, Dr Dijkstra and Masters student Callum Hatch (now working at the Natural History Museum) visited 22 sites in Devon and Cornwall that were left exposed following geological events, such as underground volcanic eruptions. These took place around 300 million years ago and brought magma from depths of 100 km to the Earth’s surface.

They took rock samples from each site, subjecting them to detailed chemical analysis in the lab using X-ray fluorescence (XRF) spectrometry.

The samples were also then dissolved in acid in order to conduct a more intensive isotopic analysis, with scientists examining the levels of two elements — strontium and neodymium — to understand the full history of the rocks.

These findings were then compared with previous studies elsewhere in the UK and mainland Europe, with the results showing the clear boundary running from the Exe estuary in the East to Camelford in the west.

“We always knew that around 10,000 years ago you would have been able to walk from England to France,” Dr Dijkstra added. “But our findings show that millions of years before that, the bonds between the two countries would have been even stronger. It explains the immense mineral wealth of South West England, which had previously been something of a mystery, and provides a fascinating new insight into the geological history of the UK.”

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Materials provided by University of Plymouth. Note: Content may be edited for style and length.

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Health24.com | Can maple leaves help you look younger?

A maple leaf extract may help prevent wrinkles, scientists say. In a new study, researchers found that certain compounds in maple leaves block the release of an enzyme called elastase, which breaks down a protein called elastin as people age. Elastin helps maintain skin elasticity.

Previous work by the same University of Rhode Island researchers found that these same compounds in maple leaves might help protect skin from inflammation and lighten dark spots, such as freckles or age spots.

“You could imagine that these extracts might tighten up human skin like a plant-based Botox, though they would be a topical application, not an injected toxin,” principal investigator Navindra Seeram said in an American Chemical Society (ACS) news release.

Such products would provide a new option for people who want natural, plant-based skincare products, and also might provide economic benefits in the United States and Canada, the researchers said.

“Many botanical ingredients traditionally come from China, India and the Mediterranean, but the sugar maple and the red maple only grow in eastern North America,” Seeram said.

Woodlot owners who currently only harvest sap from the maple trees could use the leaves as an additional source of income. The process would be sustainable because the leaves could be collected during normal pruning or when they fall from the trees in autumn, Seeram said.

The team’s research is continuing, and it’s also formulating the findings into a patent-pending product.

The study findings are scheduled for presentation at the annual meeting of the ACS, in Boston. 

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