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How light helped shape the color of our skin, eyes and curly hair

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For most of our evolutionary history, human activity has been linked to sunlight. Technology has liberated us from these ancient sleep-wake cycles, but there’s evidence that sunlight has left and continues to go away its traces.

Not only are we still awake during the day, but we sleep at night, we will thank light for a lot of other facets of our biology.

Light could have made our ancestors walk upright on two legs. Light helps explain the evolution of our skin color, why some of us have curly hair, and even the size of our eyes.

As we’ll learn in future articles on this series, light helps shape our mood, our immune system, our gut function, and way more. Light could make us sick, tell us why we’re sick, and then heal us.

Millions of years of evolutionary history mean that humans are still largely creatures of light.

We got up and left Africa

The first modern humans evolved in the warm African climate. And reducing exposure to brilliant sunlight Is one explanation why people began walking upright, on two legs. When we stand up and the Sun is directly above us, much less sunlight reaches our body.

They also can have curly hair he protected us from the hot sun. The idea is that it provides a thicker layer of insulation than straight hair to guard the scalp.

Early had additional sun protection in the form of highly pigmented skin. Sunlight breaks down folic acid (vitamin B9), accelerates aging and damages DNA. In our light ancestral climates, dark skin was protected against this. But this dark skin still confessed enough UV light to stimulate the obligatory production of vitamin D.

However, as humans colonized temperate zones with lower light, this occurred lighter skin has evolved again and againthrough different genes in several populations. This happened quickly, probably inside the last 40,000 years.

With reduced UV radiation closer to the poles, less pigmentation was needed to guard sunlight from breaking down folic acid. Lighter skin also let in additional thin light, allowing the body to provide vitamin D. But there was one big drawback: less pigmentation meant less protection against sun damage.

How our skin’s pigmentation adapts to migration patterns and changing light.

This evolutionary background is why Australia has one of the highest rates of skin cancer in the world.

Our colonial history signifies that over 50% of Australians are of Anglo-Celtic descent, have fair skin and are transplanted to an environment with high levels of UV radiation. No wonder we’re described as “a rustic scorched by the sun“.

Sunlight has also contributed to changes in human eyes. People living in high latitudes have less protective pigment of their irises. They have too larger eye sockets (and probably eyeballs), perhaps let in the more precious light.

Again, these characteristics make Australians of European descent particularly liable to our harsh light. So it’s no surprise that Australia has this unusual thing high rate of eye cancer.

We cannot move our biological clock

Our circadian rhythm – the wake-sleep cycle driven by our brains and hormones – is one other piece of heavy evolutionary baggage triggered by light.

Humans are adapted to sunlight. In the brilliant light people can see well and improved it color vision. But we see poorly in dim light, and we lack senses like acute hearing or acute smell to make up for it.

Our closest relatives (chimpanzees, gorillas, and orangutans) are also lively during the day and sleep at night, supporting the concept that early humans exhibited similar daytime behaviors.

This lifestyle probably goes back further in our evolutionary history, before the appearance of great apes, to the origins of primates.

The earliest mammals were generally nocturnal, using their small size and cover of darkness to cover from dinosaurs. However, the meteorite impact that worn out these fearsome reptiles allowed some surviving mammals, especially primates, to largely evolve each day lifestyle.

If we inherited our daylight activity pattern directly from these early primates, then this rhythm would have been part of the evolutionary history of our lineage for nearly 66 million years.

This explains why it is vitally difficult to maneuver our 24-hour clock; it’s so deeply rooted in our evolutionary history.

Next improvements in lighting technology they freed us more and more from our dependence on daylight: fire, candles, kerosene and gas lamps, and finally electric lighting. So theoretically we will work and play at any time.

However, our cognitive and physical performance deteriorates when our internal circadian cycles are disruptedfor instance, because of lack of sleep, shift work or jet lag.

Futurists have already considered the required circadian rhythms life on Mars. Fortunately, a day on Mars lasts about 24.7 hours, which is analogous to ours. This slight difference must have been the least of the worries of the first intrepid Martian colonists.

How would humans cope on Mars? At least they would not should worry an excessive amount of about their biological clock.
NikoNomada/NASA/Shutterstock

The light continues to alter us

Over the last 200 years, artificial lighting has helped (partially) disconnect us from the circadian rhythms of our ancestors. However, in recent many years this has come at the expense of our eyesight.

Many genes are related to myopia (nearsightedness). develop into more common in only 25 years, a striking example of rapid evolutionary change in the human gene pool.

And if you’ve a genetic predisposition to myopia, reduced exposure to natural light (and spending more time in artificial light) increases your likelihood of developing myopia. These noticeable changes have occurred over the course of many individuals’s lives.

Light will undoubtedly proceed to shape our biology for millennia to return, but the long-term effects could also be difficult to predict.

This article was originally published on : theconversation.com
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Health and Wellness

What are executive function delays? Research shows that they are similar for ADHD and autism

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Neurodevelopmental disorders corresponding to attention deficit hyperactivity disorder (ADHD) and autism approximately one in ten children. These conditions affect learning, behavior and development.

Executive function delays are at the center of the challenges faced by individuals with neurodevelopmental disorders. This includes skills corresponding to being attentive, switching attention, impulse control, planning, organizing and problem solving.

These skills are necessary for learning and long-term development. They have been linked to future skilled, social, academic and mental outcomes. Children with higher executive skills and support for these skills do higher in the long run.

Decades of research describe the causes of difficulties with attention and impulse control ADHD. Meanwhile, difficulties with switching attention and flexibility of considering have been proposed as the premise autism.

As a result, various supports and interventions designed for different neurodevelopmental conditions goal these skills. It creates a system during which a diagnosis is first made and then a set of support is provided based on it.

But our latest study published in Nature Human Behaviorshows that problems with executive functions are similar across neurodevelopmental conditions. Understanding these common needs could lead on to raised access to support before waiting for a particular diagnosis.

Our study found more similarities than differences

We checked out 180 studies conducted over 45 years that compared executive function skills in two or more neurodevelopmental conditions.

We combined research on all neurodevelopmental conditions defined in diagnostic manuals, including ADHD, Tourette’s syndrome, communication disorders and mental disabilities.

Surprisingly, we found that most kids with neurodevelopmental disorders showed very similar delays in executive skills.

For example, children with ADHD showed difficulties with attention and impulse control, but additionally children with autism, communication and specific learning conditions.

There were only a few differences between each neurodevelopmental condition and the kind of executive function delay.

This suggests that executive function delay is best considered a typical difficulty in all children with neurodevelopmental disorders. All of those children may gain advantage from similar support to enhance executive functioning skills.

But the supports have been silenced

The research has been happening for several many years didn’t integrate ends in various conditions. This has led to the separation of research and practice into the education, health and disability sectors.

Our data showed a gradual change within the forms of conditions that have been studied since 1980. In earlier days, a much greater percentage of research was conducted on tic disorders corresponding to Tourette’s syndrome. Over the last ten years, autism has turn out to be a subject of increased attention.

This means that research and practice also turn out to be separated from one another, based on a concentrate on funding and community interest. Some groups lose good science and practice as they turn out to be less visible within the political landscape.

This has led to a skewed support system during which specific interventions can only be offered to children with a particular diagnosis. It also limits access to support if families would not have access to diagnostic services, which might be particularly difficult in regional and rural communities.

Thanks to diagnosis-based research practices, there are now assessment services, guidelines, and treatments really helpful for autism. These are normally stand-alone and are not offered to children with ADHD, Tourette’s syndrome, communication disorders or mental disabilities, despite significant overlap in kid’s needs.

How does this affect access to support?

It is commonly difficult for families to get the assistance they need. They often describe the assessment and support process as confusing, with long waiting times and plenty barriers.

We have shown earlier Carers often use assessment and support services for a wide selection of needs, but many needs are left unaddressed.

Last national child mental health, autism AND ADHD the rules call for more integrated support for children. However, most services are not well configured for this. If that is to be achieved, such a system change will take time to implement.

Why we’d like integrated research

More integrated research will result in more coherent education, health and disability support systems for all children in need.

Research shows, for example, that many risk aspects (genetic and environmental) are common to all neurodevelopmental conditions. These include a large overlap of risk genes that are the identical across conditions, and common environmental aspects that influence development within the womb, corresponding to the usage of certain medications, stress and a big immune response.

Other research shows that most kids diagnosed with one neurodevelopmental disorder can even be diagnosed with one others.

But gaps remain. While we all know that some stimulant medications can work well for ADHD, for example, we now have less details about how they will help children with other neurodevelopmental conditions and attention difficulties.

Contrary to what we find out about social support for children with autism, we do not do much research on how we will help children with ADHD meet their social needs.

We should take a broader take a look at kid’s needs

It is essential for families to remember that if their child meets criteria for one neurodevelopmental condition, it is extremely likely that their child will meet criteria for other neurodevelopmental conditions. They will likely have many needs related to other conditions.

It is value asking clinical services about needs broader than diagnosis. This should have in mind developmental, mental and physical health needs.

It can also be necessary to contemplate that there are a lot of them interventions has the potential to support all children with neurodevelopmental disorders.

This is a very important issue for the federal government. Reviews into supporting the needs of individuals with autism, intellectual disability AND ADHD.

It is time to ascertain more integrated systems, supports and strategies for all individuals with neurodevelopmental disorders at home, school, play and work.

This article was originally published on : theconversation.com
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Health and Wellness

Glucose monitors for people with diabetes have finally been funded, but chronic labor shortages will limit the benefits

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Pharmacist financing decision continuous glucose monitoring and automatic insulin delivery systems for the roughly 18,000 people currently living with type 1 diabetes in Aotearoa New Zealand are excellent news.

The decision got here after years of pressure from patient groups and doctors.

However, there are problems in the broader system – particularly around labor shortages – which mean it will likely take years for patients to totally access insulin pump training.

Failure to handle these issues will also perpetuate health inequalities amongst Māori and Pacific people who have been less more likely to use the monitor and pump in the past and should have to attend longer for training. These delays may undermine the positive impact of Pharmac’s financing decisions.

Complex balance

Type 1 diabetes is an autoimmune disease that causes the pancreas to stop producing insulin. This extremely essential hormone is needed to maneuver glucose to each cell in the body.

Without insulin, cells (and humans) “starve to death.” Although the current approach to treating type 1 diabetes – pricking fingers to envision blood glucose levels and injecting insulin – is effective, it’s complex.

Inject an excessive amount of insulin and also you will experience low blood sugar (hypoglycemia). This causes an individual with Type 1 to feel shaky and weak, and should even fall right into a coma. Do not inject enough medicine, which will cause persistently high blood sugar levels (hyperglycemia). This results in long-term health complications.

Determining the correct quantity of insulin is elusive. Needs are consistently changing depending on the time of day, weight loss plan, exercise, illness, caffeine, alcohol, stress and other aspects. This may cost you psychologically and physiologically.

Modern solutions

Continuous monitors measure blood glucose levels 24 hours a day using a sensor placed under the skin, replacing finger prick testing. They are widely financed and used abroad.

Monitors alert users to low blood glucose levels, and so they have significantly reduced variety of hospitalizations for people with type 1 diabetes.

Combining monitors with a pump and an appropriate algorithm automates insulin delivery when glucose levels rise above the patient’s goal range – significantly reducing the burden of every day therapy.

But continuous monitors and insulin pumps are expensive.

Before Pharmac’s decision, the monitors were completely out of funding. Prices ranged from NZ$2,600 to NZ$4,800 per yr. Insulin pumps were funded, but only for a small group of people.

This has created an ever-widening capital gap. Māori and Pacific people with type 1 diabetes were less more likely to have access monitors AND patent shoes. They were also more more likely to have them repeated hospitalizations for diabetes-related events.

Labor shortage

Compared to other countries, New Zealand is slow to fund monitors.

Unfortunately, in comparison with international guidelines, there are also significant staff shortages amongst diabetes staff.

There is a shortage of all qualified health professionals dealing with type 1 diabetes, including endocrinologists, nurses, diabetes nurses, dietitians, psychologists, social staff and podiatrists.

To meet international recommendations, New Zealand would want to greater than double its clinical workforce.

Most people with type 1 diabetes will find a way to access monitors quickly because each GPs and diabetes specialists can prescribe them. However, insulin pumps and automatic insulin delivery will only be available to specialists.

Although insulin pumps offer benefits in controlling glucose levels, learning methods to use the device takes time and support out of your physicians. This is more likely to be an issue, particularly for those that already struggle to access healthcare services in the country.

The current approach to treating type 1 diabetes – finger pricking and insulin injection – is effective but could be complex.
mthipsorn/Getty Images

The issue of equity

Māori and Pacific people have a lower risk of developing type 1 diabetes current users of insulin pumps. This means there’s a transparent risk of labor shortages, with those that would profit most from automated insulin delivery being amongst the last to have access to it.

Increasingly, evidence of continuous glucose monitors AND automatic insulin delivery shows that they improve type 1 diabetes control for everyone.

Monitor use has been shown to cut back differences in glucose control between Māori and non-Māori children with type 1 diabetes.

Automatic insulin delivery might also be an efficient tool for children and adolescents at very high risk of glycemia.

Thank you, Pharmac. Funded devices are a game changer. New Zealand has moved from an outdated, unfair funding system for technology to treat type 1 diabetes to 1 that’s progressive and fair. However, far more must be done to support all those affected by this disease.

This article was originally published on : theconversation.com
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Health and Wellness

Cory Hardrict says he does 30 things a day with his kids on the weekends

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(*30*)

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Cory Hardrict is not having fun with fatherhood and it shows. On weekends,the actor said he does 30 things a day with his children, Cairo, 6, and Cree, 13.

“Yes, it’s my weekend, and when it’s daddy’s weekend, we have a ball,” he told PEOPLE at the seventh annual Black Love Summit in Los Angeles, where he was a guest on a panel on fatherhood. “We do about 30 things a day and it’s very exciting.”

The actor has two children with his ex-wife and alum Tia Mowry.

“So for them to be here and I used to be doing my daughter’s hair this morning, her nanny was doing her hair here, but all the dead ends on the edges had fallen off and were all there, so I needed to get some grease that I saw around the house and we were good to go. I smoothed it out and here we’re.

Hardrict continued, “That’s the beauty of being a father, you don’t know, but you try to figure it out and make it work. You will make things work for your children. It was great for my son and daughter to see me here.”

The actor also explained that he had all the time dreamed of fatherhood.

“I always wanted to uplift and inspire someone who would come after me, someone I could look up to and show them that anything is possible in this world.”

He concluded: “The idea of ​​having children was a beautiful thing to me and still is. I try to instill in my children great qualities, honesty and morality that they can carry on throughout their lives… They are my world. They mean everything to me and I live because of them.”

Cory and Tia were together for 14 years before she filed for divorce in 2022. In 2023, the first couple finalized their divorce. That same yr, the actor opened up about how difficult his divorce from Mowry was for him at the American Black Film Festival.

“It’s hard when you feel like you’re going through something alone and no one understands you and there’s no one there for you,” discussed in the online clip. He continued: “I cried myself to sleep every night for a year and a half. People who know me know that my children and family were everything to me. I’m stronger than I thought. By the grace of God I am here and still going.”

This article was originally published on : www.essence.com
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