Health24.com | 3 easy ways to boost your ebbing libido – almost instantly

The average number of times per month women are having sex has decreased from 6.3 to 4.8 times in 20 years. Plus, women are twice as likely to have gone without sex for a whole year compared with men (they say we’re picky, we say have you seen the slim pickings on Tinder lately?).

This joyous news comes courtesy of a new survey of sexual attitudes in the journal The Lancet, which suggests a mounting (sorry) dissatisfaction with our sex lives compared with the male of the species (although 15% of them also reported a drop in libido).

According to sexual health lecturer Dr Cath Mercer, “Stress is to blame. As is technology. People are taking their tablets and cellphones into the bedroom at night and some people are using porn as a sex substitute.”

But, as Angelina Jolie’s good rep proves, everything is reversible. Read on for three solutions to guide you back to project O.

Read more: 5 low libido causes that have nothing to do with hormones

The problem: Stress

The experts say: Your boss is the reason you associate the word “climax” with the end of a really long AGM rather than a saucy quickie up against the fridge. The humble foot massage will sort you out (bear with us here). Studies conducted by the National Institute of Health in the US have proven that reflexology instantly decreases blood pressure and lowers anxiety.

What’s more, says acupuncturist Sandra Bird, a foot massage provides access to one of the most heightened sexual release points on the body – the “yongquan” or “gushing spring” point located on the sole, about a third from the base of the second toe and two thirds from the heel edge. Basically, that midpoint where his massaging thumbs fit perfectly.

In other podiatry-related sex news, pushing on the bit between your big toe and second toe is apparently another major stress-release point. Time for a toe wax!

Read more: The top 10 reasons for low libido

The problem: Devices

The experts say: Emailing, scrolling through News24 comments and playing Candy Crush are detracting from the actual button pressing you want in the bedroom. A recent study published in the Journal of Sexual Medicine found that when women ignore common distractions (phones, TVs, laptops), they can start to become aroused in as little as 30 seconds. Yet an eye-watering 81% of adults always take their cellphone or tablet to the bedroom at night.

Here’s how to kick the habit: Set your alarm before you even enter the bedroom and don’t touch your phone once you’re in bed, suggests Dr Elna Rudolph, WH sex expert and head of MySexualHealth.co.za. Or, on the flip side, you could make your smartphone part of the action (no, not like that, there aren’t enough screen wipes in the world for that game).

Read more: 4 best foods to give your libido a boost

The problem: Porn

The experts say: Women make up one in three viewers. What’s more, a recent survey found that both sexes aged 16 to 44 say watching it is often more exciting than the real thing. If you’re busy getting more on-screen action than off, be careful. “Exposure to explicit content gives you an addictive chemical rush and neuronal firing in your brain – much like cocaine,” says Dr Rudolph. “Compared to porn, normal sex will most likely be far less intense.”

Solo viewing can put an intimacy wedge between you and your partner, so convert porn-viewing to a joint activity instead. “Use it for inspiration for sex moves or to open up dialogue about what you like or don’t like,” says Dr Rudolph. “But, if you need it to get into the mood every time, there’s something else going on.”

For something genuinely educational, try DreamsOfSpanking.com, which weaves tips on technique into the entertainment. And no, sadly, Magic Mike Uncut is not on there.

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

Image credit: iStock 

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Health24.com | 7 yoga poses that might help your digestion

Time: 3 minutes

Equipment: Yoga mat

Good for: Digestion

Instructions: Flow from one pose to the next, repeating on both sides where noted. Complete the yoga flow as many times as you’d like. You can also hold each pose for more than one breath, to make the flow a bit longer.

Wide-stance forward fold

How to: Bring your feet in a wide stance, about three to four feet apart. Raise your arms out to the sides and slowly bend forward, placing both hands on your mat. Hold for a breath, then continue to the next move.

Read more: This yoga flow is actually a crazy-good cardio workout

Wide-stance forward fold with twist

How to: From a wide-angle forward fold, place your right hand on the mat, equidistant between your feet. Raise your left arm out to the side and up, twisting your body, and turn your gaze up to your fingers. Lower your left arm and place it where your right hand is. Repeat on the other side, then continue to the next move.

High lunge

How to: From a low lunge, root your feet foot firmly into the ground and rise up, lifting both arms overhead, keeping your shoulders down. Lift your torso, and square your hips to face forward. Hold for a breath, then continue to the next move.

Read more: This 2-minute yoga flow will get your core fired up ASAP

Revolved side angle

How to: From high lunge, make sure your right knee is directly above your right ankle. Turn your torso to the right and then lean forward, either with your hands in prayer position or with your left arm extended down to the inside of your right foot. Repeat high lunge and revolved side angle on the other side.

Hindu squat

How to: Stand with your knees slightly wider than your hips. Bend your knees and sit down as deeply as you can, reaching your arms forward, if needed, to keep your balance. If possible, place your arms between your knees in prayer position. Hold for a couple of breaths then continue to the next pose.

Wind-relieving pose

How to: Lie on your back. Bring your knees into your chest and wrap your arms around them. You can also twist your knees to one side, then the other, keeping your upper back flat on the ground, for a nice lower back stretch. Continue to the next pose.

Savasana

How to: Lie on your mat with your legs extended. Rest your arms at your sides. 

Complete the entire flow as many times as you’d like.

This article was originally published on www.womenshealthmag.com 

Image credit: iStock 

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Health24.com | Breastfeeding? Here’s what you should know

Whether to breastfeed or not is a personal choice for a mom. Breastfeeding is, however, in accordance with national and international optimal infant and young child feeding recommendations.

If you have decided to breastfeed your little one, here are a few things you should know, according to Catherine Pereira, Association for Dietetics in South Africa spokesperson, registered dietitian and lecturer at the University of the Western Cape.

Pereira says that the nutritional requirements for breastfeeding mothers are a little bit higher than for non-breastfeeding women.

“Vitamin and mineral requirements are higher and energy requirements are approximately 500kCal per day more than for a non-breastfeeding woman. In South Africa, we encourage everyone to follow the South African food-based dietary guidelines, which were compiled by nutrition experts in conjunction with the Department of Health and international organisations.”

South African food-based dietary guidelines

  • Enjoy a variety of foods.
  • Be active!
  • Make starchy foods part of most meals.
  • Eat plenty of vegetables and fruit every day.
  • Eat dry beans, split peas, lentils and soya regularly.
  • Have milk, maas or yoghurt every day.
  • Fish, chicken, lean meat or eggs can be eaten daily.
  • Drink lots of clean, safe water.
  • Use fats sparingly. Choose vegetable oils rather than hard fats.
  • Use sugar and foods and drinks high in sugar sparingly.
  • Use salt and food high in salt sparingly. 

Pereira says that breastfeeding women do not require a special or different diet; they just have higher nutrient requirements. “Many women want to lose extra weight that they may have gained during pregnancy after they have given birth and one of the many benefits of breastfeeding to the mother is that it can help her to lose some of that weight,” she says.

How long to breastfeed for

The World Health Organization (WHO) and the United Nations Children’s Fund (UNICEF), which are the global health authorities that many countries and health professionals take guidance from, provide the following recommendations for optimal infant and young child feeding: 

  • “Early initiation of breastfeeding (this means starting to breastfeed within one hour of birth);
  • exclusive breastfeeding for the first six months of life; and
  • introduction of nutritionally-adequate and safe complementary (solid) foods at six months together with continued breastfeeding up to two years of age or beyond.”

The South African National Department of Health endorses the above recommendations. 

What if breastfeeding is not an option?

Unfortunately not all women are able to breastfeed. However, Pereira says there are strict international basic minimum standards set by Codex Alimentarius that all infant formula has to comply with. There is a specific Codex Standard for Infant Formula that contains guidelines on the minimum nutrient and safety requirements with regards to how infant formulas are manufactured, together with packaging and labelling requirements. Therefore, all infant formula is generally of quite a similar quality. Most mothers should be able to breastfeed (with adequate support).

“However, in the minority of cases where either a mother has passed away or the mother is unable to breastfeed due to illness or other reasons, usually a standard infant formula is sufficient. In the even more rare cases where an infant has a serious medical condition, then a dietitian and/or doctor would need to conduct a comprehensive assessment of the infant and provide specific, individualised advice to the mother or caregiver regarding which formula would be most suitable,” says Pereira.

Most mothers should be able to breastfeed (with adequate support from health facilities, communities and the workplace).

Image credit: iStock 

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Health24.com | What is smegma? This condition is actually pretty common

It goes without saying that, as is the case with all of your other body parts, washing your penis should be a part of your daily shower routine. But if you’ve been practicing poor hygiene, or just generally neglecting to thoroughly wash down there, beware: You may have developed smegma.

A common condition that affects guys who don’t clean their junk enough (or don’t clean in the right way), smegma, a.k.a. “penis cheese”, is a white substance that typically collects around the head of the penis. While anyone can get it, guys who are uncircumcised are particularly prone.

Read more: How does circumcision really affect your sex life? Here are the facts

But what is smegma, and how do you prevent it? We asked clinical sexologist Eric Marlowe Garrison and Dr Debby Herbenick, a professor at the Indiana University School of Public Health and director of the Center for Sexual Health Promotion, for more information.

What is smegma?

Smegma is a combination of secretions from sebaceous oil glands and dead skin cells that collect under the foreskin of your penis. This results in a white, cheese-like substance. (Actually, “smegma” is the Greek word for “soap”, which is both ironic and makes buying toiletries in an Athens hotel gift shop extremely awkward.) When these substances “build up underneath the foreskin, it can provide a host for bacteria”, says Garrison.

Garrison also notes that it’s possible for both uncircumcised and circumcised men to develop smegma. (It’s also common in women, where it’s most likely to appear between the folds of the vagina’s labia or around the clitoral hood.)

Because “no circumcision is perfect” Garrison says, even circumcised men may have a tiny bit of foreskin remaining, creating the opportunity for smegma to build up. They may also develop smegma beneath the corona of the penis (i.e., underneath the head), because “most American families don’t teach young adults how to care for their sex organs”, says Garrison.

Read more: STD symptoms that affect the rest of your body

Is smegma common?

Yes, according to Dr Herbenick. “We all have skin cells and sebaceous glands,” she says. “Together, these create smegma for both males and females.” Indeed, the oils that result in smegma are naturally secreted by the body to lubricate the genitals and keep them from feeling dry. So having smegma doesn’t mean you’re dirty or unclean – it just means you should probably wash and clean your penis a bit more thoroughly.

In itself, smegma is pretty harmless. But if you let it build up, it can result in the smegma hardening and producing a bad smell.

“The combination of dead skin cells and bacteria not only leads to an unsightly (and foul-smelling/tasting) collection of cells, but it can also cause skin irritations and breaks in the skin that could facilitate a sexually transmissible infection,” Garrison cautions.

If you’re uncircumcised, and you let it build up for a really long time, it can also cause your foreskin to stick to the penis, which can necessitate a painful trip to the dermatologist’s office.

How to treat and prevent smegma

Basically, this is all you need to do:

If you wash with soap and water regularly, then any light smegma build-up is nothing to worry about. “It does not need to be treated or gotten rid of, other than being gently wiped away with fingers or a washcloth (kind of like how ear wax is just wiped away),” says Dr Herbenick.

Read more: Guys share the cringeworthy sex injuries that landed them in hospital

That said, if you’re uncircumcised and you’ve been accumulating quite a bit of smegma, Garrison says you may need to be more aggressive about your hygiene practices. Gently pull the foreskin back and use a washcloth, some warm water, and a mild soap to clean underneath the head of the penis.

“A lack of foreskin hygiene, not merely the presence of a foreskin, [may be linked to] an increase in HIV infections among uncircumcised men,” he says. “Anytime that penile skin is compromised, it can become a route for infection, [which can] be a path for a bacterium, virus or fungus to take hold.”

In a small number of cases, smegma build-up and hardening can cause the penis to become irritated and red, which can lead to a condition called balanitis. “If a person has an infection underneath the foreskin as a result of smegma, they should see a dermatologist before it gets worse. Or before they might acquire an STI,” says Garrison.

The best way to prevent smegma is the same method used to treat it: Wash your penis at least twice a week, and if you’re uncircumcised, pull back your foreskin and wash with soap and water. Practicing good hygiene will save you a lot of trouble further on down the road.

This article was originally published on www.menshealth.com

Image credit: iStock  

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Engineers fly first-ever plane with no moving parts

Since the first airplane took flight over 100 years ago, virtually every aircraft in the sky has flown with the help of moving parts such as propellers, turbine blades, and fans, which are powered by the combustion of fossil fuels or by battery packs that produce a persistent, whining buzz.

Now MIT engineers have built and flown the first-ever plane with no moving parts. Instead of propellers or turbines, the light aircraft is powered by an “ionic wind” — a silent but mighty flow of ions that is produced aboard the plane, and that generates enough thrust to propel the plane over a sustained, steady flight.

Unlike turbine-powered planes, the aircraft does not depend on fossil fuels to fly. And unlike propeller-driven drones, the new design is completely silent.

“This is the first-ever sustained flight of a plane with no moving parts in the propulsion system,” says Steven Barrett, associate professor of aeronautics and astronautics at MIT. “This has potentially opened new and unexplored possibilities for aircraft which are quieter, mechanically simpler, and do not emit combustion emissions.”

He expects that in the near-term, such ion wind propulsion systems could be used to fly less noisy drones. Further out, he envisions ion propulsion paired with more conventional combustion systems to create more fuel-efficient, hybrid passenger planes and other large aircraft.

Barrett and his team at MIT have published their results in the journal Nature.

Hobby crafts

Barrett says the inspiration for the team’s ion plane comes partly from the movie and television series, “Star Trek,” which he watched avidly as a kid. He was particularly drawn to the futuristic shuttlecrafts that effortlessly skimmed through the air, with seemingly no moving parts and hardly any noise or exhaust.

“This made me think, in the long-term future, planes shouldn’t have propellers and turbines,” Barrett says. “They should be more like the shuttles in ‘Star Trek,’ that have just a blue glow and silently glide.”

About nine years ago, Barrett started looking for ways to design a propulsion system for planes with no moving parts. He eventually came upon “ionic wind,” also known as electroaerodynamic thrust — a physical principle that was first identified in the 1920s and describes a wind, or thrust, that can be produced when a current is passed between a thin and a thick electrode. If enough voltage is applied, the air in between the electrodes can produce enough thrust to propel a small aircraft.

For years, electroaerodynamic thrust has mostly been a hobbyist’s project, and designs have for the most part been limited to small, desktop “lifters” tethered to large voltage supplies that create just enough wind for a small craft to hover briefly in the air. It was largely assumed that it would be impossible to produce enough ionic wind to propel a larger aircraft over a sustained flight.

“It was a sleepless night in a hotel when I was jet-lagged, and I was thinking about this and started searching for ways it could be done,” he recalls. “I did some back-of-the-envelope calculations and found that, yes, it might become a viable propulsion system,” Barrett says. “And it turned out it needed many years of work to get from that to a first test flight.”

Ions take flight

The team’s final design resembles a large, lightweight glider. The aircraft, which weighs about 5 pounds and has a 5-meter wingspan, carries an array of thin wires, which are strung like horizontal fencing along and beneath the front end of the plane’s wing. The wires act as positively charged electrodes, while similarly arranged thicker wires, running along the back end of the plane’s wing, serve as negative electrodes.

The fuselage of the plane holds a stack of lithium-polymer batteries. Barrett’s ion plane team included members of Professor David Perreault’s Power Electronics Research Group in the Research Laboratory of Electronics, who designed a power supply that would convert the batteries’ output to a sufficiently high voltage to propel the plane. In this way, the batteries supply electricity at 40,000 volts to positively charge the wires via a lightweight power converter.

Once the wires are energized, they act to attract and strip away negatively charged electrons from the surrounding air molecules, like a giant magnet attracting iron filings. The air molecules that are left behind are newly ionized, and are in turn attracted to the negatively charged electrodes at the back of the plane.

As the newly formed cloud of ions flows toward the negatively charged wires, each ion collides millions of times with other air molecules, creating a thrust that propels the aircraft forward.

The team, which also included Lincoln Laboratory staff Thomas Sebastian and Mark Woolston, flew the plane in multiple test flights across the gymnasium in MIT’s duPont Athletic Center — the largest indoor space they could find to perform their experiments. The team flew the plane a distance of 60 meters (the maximum distance within the gym) and found the plane produced enough ionic thrust to sustain flight the entire time. They repeated the flight 10 times, with similar performance.

“This was the simplest possible plane we could design that could prove the concept that an ion plane could fly,” Barrett says. “It’s still some way away from an aircraft that could perform a useful mission. It needs to be more efficient, fly for longer, and fly outside.”

Barrett’s team is working on increasing the efficiency of their design, to produce more ionic wind with less voltage. The researchers are also hoping to increase the design’s thrust density — the amount of thrust generated per unit area. Currently, flying the team’s lightweight plane requires a large area of electrodes, which essentially makes up the plane’s propulsion system. Ideally, Barrett would like to design an aircraft with no visible propulsion system or separate controls surfaces such as rudders and elevators.

“It took a long time to get here,” Barrett says. “Going from the basic principle to something that actually flies was a long journey of characterizing the physics, then coming up with the design and making it work. Now the possibilities for this kind of propulsion system are viable.”

This research was supported, in part, by MIT Lincoln Laboratory Autonomous Systems Line, the Professor Amar G. Bose Research Grant, and the Singapore-MIT Alliance for Research and Technology (SMART). The work was also funded through the Charles Stark Draper and Leonardo career development chairs at MIT.

Video: https://www.youtube.com/watch?v=boB6qu5dcCw

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For ants, unity is strength — and health

When a pathogen enters their colony, ants change their behavior to avoid the outbreak of disease. In this way, they protect the queen, brood and young workers from becoming ill. These results, from a study carried out in collaboration between the groups of Sylvia Cremer at the Institute of Science and Technology Austria (IST Austria) and of Laurent Keller at the University of Lausanne, are published today in the journal Science.

High population density, as well as frequent and close contacts between individuals, contribute to a rapid spread of diseases. To protect their colonies, ants have developed disease defense mechanisms, including adaptations to their social organization. Ants do not interact randomly with other colony members, but are organized in sub-groups according to their age and the tasks they carry out. While young worker ants, so-called “nurses,” look after the valuable brood at the center of the colony, older worker ants become foragers that collect food outside the nest. These forager ants are more exposed to pathogens.

Strengthening the fort

The researchers used a “barcode” system developed in the Keller group to follow the interactions between ants, especially to observe their behavior when disease spreads. In a first experiment, they placed digital markers on 2’266 garden ants. Infrared cameras took an image of the colonies every half second, and so the researchers could follow and measure the movement and position of each individual, and their social interactions. The researchers showed that the ants’ subdivision into groups acts prophylactically and reduces the risk that disease spreads.

10% of the worker ants (all foragers) were then exposed to fungal spores which spread easily through contact. Comparing the ant colonies before and after pathogen exposure showed that the ants quickly detect the presence of the fungal spores and change their behavior to strengthen already existing defenses. “The ants change how they interact and who they interact with,” explains Sylvia Cremer, “The cliques among ants become even stronger, and contact between cliques is reduced. Foragers interact more with foragers, and nurses more with nurses. This is a response by the whole colony — also animals who are not themselves treated with spores change their behavior.” Laurent Keller adds: “This is the first scientific study that shows that an animal society is able to actively change its organization to reduce the spread of disease.”

Using a highly sensitive qPCR method established in the Cremer group, the researchers could quantify exactly how many spores an individual ant carried on its body. qPCR monitors how a targeted DNA molecule is amplified during the so-called polymerase chain reaction. This allows researchers to draw conclusion about how much of the DNA, and by inference how much of the fungal spores, were present in the beginning.

Because the ants changed how they interact, spores transfer patterns also changed. Only few individuals received a high pathogen dose, which could cause disease. In addition, more ants received a low dose, which Cremer and her group previously showed to not cause disease but instead be protective in the face of future infections — similar to variolation in humans. “The pathogen is distributed on many shoulders, and the ants’ immune systems can deal very well with this lower pathogen level, which provides a form of immune memory,” says Cremer.

Save the queen

The analyses also showed that the colony protects especially valuable animals. The queen, the only individual that reproduces, and the nurses, young worker ants that can still contribute many hours of work to the colony, received less of the pathogen. “In a colony, not all animals have to be protected — but the most valuable individuals should survive,” Keller explains.

The researchers also carried out a survival experiment, to see how pathogen load 24 hours after exposure correlates with death from disease. The correlation was high, says Nathalie Stroeymeyt, first author and Postdoc in the group of Laurent Keller: “We calculated a predictive spore load for each individual ant, based on its interaction with other ants in the first 24 hours after pathogen exposure. Ants with a high predicted spore load were more likely to die nine days after exposure than ants with a low predicted spore load.” She summarizes: “Mortality was higher among foragers than among nurses. And all the queens were still alive at the end of the experiment.”

How ants collectively deal with problems, such as the risk of an epidemic, could give insights into general principles of disease dynamics, says Cremer: “Social interactions are the routes on which diseases travel and define how epidemics may spread. Basic research on ants can help us to deeper understand epidemiological processes, which can be relevant also in other social groups.”

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Human ancestors not to blame for ancient mammal extinctions in Africa

New research disputes a long-held view that our earliest tool-bearing ancestors contributed to the demise of large mammals in Africa over the last several million years. Instead, the researchers argue that long-term environmental change drove the extinctions, mainly in the form of grassland expansion likely caused by falling atmospheric carbon dioxide (CO2) levels.

Tyler Faith, curator of archaeology at the Natural History Museum of Utah and assistant professor in the Department of Anthropology at the University of Utah, led the study. The research team also includes John Rowan from the University of Massachusetts Amherst, Andrew Du from the University of Chicago, and Paul Koch from the University of California, Santa Cruz.

The study is published today in the journal Science.

“Despite decades of literature asserting that early hominins impacted ancient African faunas, there have been few attempts to actually test this scenario or to explore alternatives,” Faith says. “We think our study is a major step towards understanding the depth of anthropogenic impacts on large mammal communities, and provides a convincing counter-argument to these long-held views about our early ancestors.”

To test for ancient hominin impacts, the researchers compiled a seven-million-year record of herbivore extinctions in eastern Africa, focusing on the very largest species, the so-called ‘megaherbivores’ (species over 2,000 lbs.) Though only five megaherbivores exist in Africa today, there was a much greater diversity in the past. For example, three-million-year-old ‘Lucy’ (Australopithecus afarensis) shared her woodland landscape with three giraffes, two rhinos, a hippo, and four elephant-like species at Hadar, Ethiopia.

When and why these species disappeared has long been a mystery for archaeologists and paleontologists, despite the evolution of tool-using and meat-eating hominins getting most of the blame.

“Our analyses show that there is a steady, long-term decline of megaherbivore diversity beginning around 4.6 million years ago. This extinction process kicks in over a million years before the very earliest evidence for human ancestors making tools or butchering animal carcasses and well before the appearance of any hominin species realistically capable of hunting them, like Homo erectus,” says Faith.

Taking a Closer Look

Faith and his team quantified long-term changes in eastern African megaherbivores using a dataset of more than 100 fossil assemblages spanning the last seven million years. The team also examined independent records of climatic and environmental trends and their effects, specifically global atmospheric CO2, stable carbon isotope records of vegetation structure, and stable carbon isotopes of eastern African fossil herbivore teeth, among others.

Their analysis reveals that over the last seven million years substantial megaherbivore extinctions occurred: 28 lineages became extinct, leading to the present-day communities lacking in large animals. These results highlight the great diversity of ancient megaherbivore communities, with many having far more megaherbivore species than exist today across Africa as a whole.

Further analysis showed that the onset of the megaherbivore decline began roughly 4.6 million years ago, and that the rate of diversity decline did not change following the appearance of Homo erectus, a human ancestor often blamed for the extinctions. Rather, Faith’s team argues that climate is more likely culprit.

“The key factor in the Plio-Pleistocene megaherbivore decline seems to be the expansion of grasslands, which is likely related to a global drop in atmospheric CO2 over the last five million years,” says John Rowan, a postdoctoral scientist from University of Massachusetts Amherst. “Low CO2 levels favor tropical grasses over trees, and as a consequence savannas became less woody and more open through time. We know that many of the extinct megaherbivores fed on woody vegetation, so they seem to disappear alongside their food source.”

The loss of massive herbivores may also account for other extinctions that have also been attributed to ancient hominins. Some scientist suggest that competition with increasingly carnivorous species of Homo led to the demise of numerous carnivores over the last few million years. Faith and his team suggest an alternative.

“We know there are also major extinctions among African carnivores at this time and that some of them, like saber-tooth cats, may have specialized on very large prey, perhaps juvenile elephants” says Paul Koch. “It could be that some of these carnivores disappeared with their megaherbivore prey.”

“Looking at all of the potential drivers of the megaherbivore decline, our analyses suggest that changing climate and environment played the key role in Africa’s past extinctions,” said Faith. “It follows that in the search for ancient hominin impacts on ancient African ecosystems, we must focus our attention on the one species known to be capable of causing them — us, Homo sapiens, over the last 300,000 years.”

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Gigantic mammal ‘cousin’ discovered

During the Triassic period (252-201 million years ago) mammal-like reptiles called therapsids co-existed with ancestors to dinosaurs, crocodiles, mammals, pterosaurs, turtles, frogs, and lizards. One group of therapsids are the dicynodonts. Researchers at Uppsala University in Sweden, together with colleagues in Poland, have discovered fossils from a new genus of gigantic dicynodont. The new species Lisowicia bojani is described in the journal Science.

The earth is about 4.5 billion years old and has gone through many geological periods and dramatic change. During the Triassic period, about 252-201 million years ago, all land on Earth came together and formed the massive continent called Pangea. During this time, the first dinosaurs came into being as well as ancestors to crocodiles, mammals, pterosaurs, turtles, frogs, and lizards. Recently, scientists have become interested in another type of animal, therapsids. Therapsids were “mammal-like” reptiles and are ancestors to the mammals, including humans, found today. One group of therapsids is called dicynodonts. All species of dicynodonts were herbivores (plant eaters) and their sizes ranged from small burrowers to large browsers. Most of them were also toothless. They survived the Permian mass extinction and became the dominant terrestrial herbivores in the Middle and Late Triassic. They were thought to have died out before the dinosaurs became the dominant form of tetrapod on land.

For the first time, researchers in the research programme Evolution and Development at Uppsala University in collaboration with researchers at the Polish Academy of Sciences (Warsaw), have discovered fossils from a new species of dicynodont in the Polish village of Lisowice. The species was named Lisowicia bojani after the village and a German comparative anatomist named Ludwig Heinrich Bojanus who worked in Vilnius and is known for making several important anatomical discoveries. The findings show that the Lisowicia was about the size of a modern-day elephant, about 4.5 metres long, 2.6 metres high and weighed approximately 9 tons, which is 40 percent larger than any previously identified dicynodont. Analysis of the limb bones showed that they had a fast growth, much like a mammal or a dinosaur. It lived during the Late Triassic, about 210-205 million years ago, about 10 million years later than previous findings of dicynodonts.

“The discovery of Lisowicia changes our ideas about the latest history of dicynodonts, mammal Triassic relatives. It also raises far more questions about what really make them and dinosaurs so large,” says Dr Tomasz Sulej, Polish Academy of Sciences.

“Dicynodonts were amazingly successful animals in the Middle and Late Triassic. Lisowicia is the youngest dicynodont and the largest non-dinosaurian terrestrial tetrapod from the Triassic. It’s natural to want to know how dicynodonts became so large. Lisowicia is hugely exciting because it blows holes in many of our classic ideas of Triassic ‘mammal-like reptiles’,” says Dr Grzegorz Niedzwiedzki, Uppsala University.

The first findings of fossils from Lisowice in Poland were made in 2005 by Robert Borz?cki and Piotr Menducki. Since then, more than 1,000 bones and bone fragments have been collected from the area, including fossils from Lisowicia. The area is thought to have been a river deposit during the Late Triassic period.

The discovery of Lisowicia provides the first evidence that mammal-like elephant sized dicynodonts were present at the same time as the more well-known long-necked sauropodomorph dinosaurs, contrary to previous belief. Sauropodomorphs include species like the Diplodocus or Brachiosaurus. It fills a gap in the fossil record of dicynodonts and it shows that some anatomical features of limbs thought to characterize large mammals or dinosaurs evolved also in the non-mammalian synapsid. Finally, these findings from Poland are the first substantial finds of dicynodonts from the Late Triassic in Europe.

“The discovery of such an important new species is a once in a lifetime discovery,” says Dr Tomasz Sulej.

Story Source:

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

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Health24.com | Low-carb diets may work by boosting calorie burn

Strictly limiting carbohydrates and eating more fat may help the body burn more calories, a new clinical trial shows.

Researchers found that among 164 adults in a weight-loss study, those placed on a low-carb, high-fat diet burned more daily calories, versus those given high-carb meals. On average, their bodies used up 250 extra calories per day over 20 weeks.

Study refutes conventional thinking

The researchers estimated that over three years, that would translate into an additional 20-pound weight loss for an average-height man.

“This study refutes the conventional thinking that it’s only calorie-cutting that matters,” said senior researcher Dr David Ludwig. He is co-director of the New Balance Foundation Obesity Prevention Center at Boston Children’s Hospital.

Instead, he said, the source of those calories may make the difference in whether your metabolism “works with you or against you”.

According to Ludwig, the findings support a theory called the “carbohydrate-insulin model”. The premise is that diets heavy in processed carbs send insulin levels soaring, which drives the body to use fewer calories, and instead store more of them as fat.

“Our study suggests that you’ll do better if you focus on reducing refined carbohydrates, rather than focusing on reducing calories alone,” Ludwig said.

He and his colleagues reported the findings online in the BMJ.

‘Feeding study’

Many studies over the years have attempted to answer the question of whether low-fat or low-carb is better for weight loss. Often, they’ve concluded there is little difference.

But those studies, Ludwig said, have typically been behavioural studies where people may or may not stick with their diets.

So his team conducted a “feeding study” to carefully control what people ate.

First, 234 overweight and obese adults were recruited for a “run-in” phase, with the goal of losing about 12% of their weight over 10 weeks. Their diets were low-calorie and had moderate amounts of carbs.

Of that group, 164 lost enough weight and moved on to the next phase. They were randomly assigned to either a low-carb, moderate-carb or high-carb diet for 20 weeks.

People on the low-carb diet got 20% of their calories from carbs like vegetables, fruits and beans; a full 60% of their calories came from fat, including sources like meat, whole milk, cheese and nuts. The remaining 20% of calories came from protein.

The situation was flipped for people on the high-carb plan: 60% of calories from carbs and 20% from fat. The moderate plan divided the two nutrients equally, at 40/40.

Effects on calorie burning

After 20 weeks, the low-carb group appeared to be burning more calories – an average of 250 more per day, versus the high-carb group, and 111 more than the moderate-carb group.

The researchers did not look at the effects on any further weight loss. Instead, each person’s calorie intake was calibrated to maintain what they’d already lost. The point, Ludwig explained, was to zero in on the effects of the different diets on calorie burning.

According to Dr Anastassia Amaro, an assistant professor of endocrinology and metabolism at the University of Pennsylvania, “The study design is very clever.”

Amaro, who was not involved in the research, said she already suggests that patients cut back on carbs when they are trying to lose weight.

These findings, she said, will boost her confidence in that advice.

No grains and added sugars

However, Amaro said, the low-carb diet used in this study is not ready for a “direct translation” into the real world. For one, she explained, it’s not clear whether it’s the lack of carbs that was key.

“This is also a high-fat diet,” Amaro pointed out. “Is it the lack of carbs, the fat content, or both?”

What about the nutritional value of such a diet? Ludwig said it’s healthy – allowing fruit, legumes and an “unlimited” amount of vegetables, for instance.

“What it doesn’t have is grains and added sugar,” he said.

Ludwig agreed, however, that more research is needed to show whether the approach is the best way to maintain weight loss. He and his colleagues recently started a new trial that will pit a very low-carb diet against one that is high-carb but low in sugar, and another that is high-carb/high-sugar.

And what about people who currently have a healthy weight? Would a low-carb, high-fat diet cause their bodies to burn more calories?

That’s a “good question,” Amaro said – but this study can’t answer it.

Image credit: iStock

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Health24.com | Is it possible to prevent incontinence?

Having a healthy bladder means that you urinate between four and six times per day and once (or not at all) during the night; your urine is a pale yellow in colour; and you don’t have any accidental leaks.

However, if you suffer from urinary incontinence, you may find that you’re having accidental leaks that are both embarrassing and inconvenient. Fortunately, there are ways to prevent this from happening. Here are five things you can do:

1. Avoid becoming dehydrated

Dehydration can cause constipation and bladder irritation, which can result in incontinence. Make sure you drink plenty of water – taking small sips, instead of downing an entire glass of water in one go, can help spread your fluid intake evenly through the day. Also consume more fluids during hot weather or after strenuous exercise, when you are likely to sweat a lot. Carbonated drinks, alcohol, tea and coffee can cause bladder irritation, while fruit juice, milk or soup are hydrating.

2. Stay active and exercise

Staying active will help you maintain a healthy body weight, which in turn reduces pressure on the pelvic floor – this sling of muscle is responsible for bladder and bowel control. Exercising can be simple – go for a regular 30 minute walk or pick an activity you enjoy (such as dancing, yoga or swimming).

The Better Health Channel recommends keeping your pelvic floor muscles in shape: “Obesity, pregnancy, childbirth, regular heavy lifting, high impact exercise and a chronic cough can weaken the pelvic floor, but you can strengthen these muscles with specific exercises.” 

3. Maintain a healthy weight

If you are overweight, you are at a higher risk of incontinence, says a study published in the Journal of Urology. The researchers explain that carrying extra weight puts additional pressure on your bladder. Women’s Health reports that incontinence caused by weight gain is pretty easy to reverse. They cite another study published in the same journal that reported that women who were able to lose weight (and keep it off), had decreased their leakage by 65% one year later.

4. Treat constipation

If you find yourself regularly constipated, you could be contributing to urinary incontinence, as the constant straining to empty your bowels can weaken your pelvic floor muscles. According to the NHS, you should never delay the urge to empty your bowels. They say that changing your diet and lifestyle by eating more fibre-rich foods and exercising regularly can help prevent constipation and thus urinary incontinence.

5. Train your bladder

According to John Hopkins Medicine, there are two ways to train your bladder. The first involves Kegel exercises that, if done regularly and correctly, tighten muscles in your pelvis, which helps strengthen them and thus prevent accidental leaks. The second exercise is called “The Knack”, and with this method you do a Kegel as you’re about to cough, sneeze or do any other activity that usually tends to trigger a leak.

When to see the doctor

Although you might find incontinence embarrassing, don’t hesitate to talk to your doctor about it. Dr Prenevin Govender, a Cape Town-based urologist and Health24’s Incontinence Expert, previously told Health24, “Incontinence is never ‘normal’ and if you experience it, you should always go to your doctor. In some cases, your doctor may refer you to a urologist.”

Make sure you see your doctor under the following circumstances:

  • When you suddenly experience incontinence 
  • When incontinence affects your lifestyle
  • When you constantly feel as though you have a full bladder

Image credit: iStock

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