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Even short trips to space can change an astronaut’s biology − a new set of studies offers the most comprehensive look at spaceflight health since NASA’s Twins Study

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theconversation.com – Susan Bailey, Professor of Radiation Cancer Biology and Oncology, Colorado – 2024-07-03 07:22:56

Crew members from the Inspiration4 mission. New research looks at the biological effects of their short trip to space.
SpaceX, CC BY-NC

Susan Bailey, Colorado State University

Only about 600 people have ever traveled to space. The vast majority of astronauts over the past six decades have been middle-aged on short-duration missions of fewer than 20 days.

, with private, commercial and multinational spaceflight providers and flyers entering the market, we are witnessing a new era of human spaceflight. Missions have ranged from minutes, hours and days to months.

As humanity looks ahead to returning to the Moon over the coming decade, space exploration missions will be much longer, with many more space travelers and even space tourists. This also means that a wider diversity of people will experience the extreme environment of space – more women and people of different ethnicities, ages and health status.

Since people respond differently to the unique stressors and exposures of space, researchers in space health, like me, seek to better understand the human health effects of spaceflight. With such information, we can figure out how to astronauts stay healthy both while they’re in space and once they return to Earth.

As part of the historic NASA Twins Study, in 2019, my colleagues and I published groundbreaking research on how one year on board the International Space Station affects the human body.

I am a radiation cancer biologist in Colorado State University’s Department of Environmental and Radiological Health Sciences. I’ve spent the past few years continuing to build on that earlier research in a of papers recently published across the portfolio of Nature journals.

These papers are part of the Space Omics and Medical Atlas package of manuscripts, data, protocols and repositories that represent the largest collection ever assembled for aerospace medicine and space biology. Over 100 institutions from 25 countries contributed to the coordinated release of a wide range of spaceflight data.

The NASA Twins Study

NASA’s Twins Study seized on a unique research .

NASA selected astronaut Scott Kelly for the agency’s first one-year mission, during which he spent a year on board the International Space Station from 2015 into 2016. Over the same time period, his identical twin brother, Mark Kelly, a former astronaut and current U.S. senator representing Arizona, remained on Earth.

Even short trips to space can change an astronaut’s biology − a new set of studies offers the most comprehensive look at spaceflight health since NASA’s Twins Study
NASA astronaut Scott Kelly, left, who went into space during the NASA Twins Study, stands next to his twin brother, Mark Kelly, who stayed on Earth.
AP Photo/Pat Sullivan

My team and I examined blood samples collected from the twin in space and his genetically matched twin back on Earth before, during and after spaceflight. We found that Scott’s telomeres – the protective caps at the ends of chromosomes, much like the plastic tip that keeps a shoelace from fraying – lengthened, quite unexpectedly, during his year in space.

When Scott returned to Earth, however, his telomeres quickly shortened. Over the months, his telomeres recovered but were still shorter after his journey than they had been before he went to space.

As you get older, your telomeres shorten because of a variety of factors, stress. The length of your telomeres can serve as a biological indicator of your risk for developing age-related conditions such as dementia, cardiovascular disease and cancer.

In a separate study, my team studied a cohort of 10 astronauts on six-month missions on board the International Space Station. We also had a control group of age- and sex-matched participants who stayed on the ground.

We measured telomere length before, during and after spaceflight and again found that telomeres were longer during spaceflight and then shortened upon return to Earth. Overall, the astronauts had many more short telomeres after spaceflight than they had before.

One of the other Twins Study investigators, Christopher Mason, and I conducted another telomere study – this time with twin high-altitude mountain climbers – a somewhat similar extreme environment on Earth.

We found that while climbing Mount Everest, the climbers’ telomeres were longer, and after they descended, their telomeres shortened. Their twins who remained at low altitude didn’t experience the same changes in telomere length. These results indicate that it’s not the space station’s microgravity that led to the telomere length changes we observed in the astronauts – other culprits, such as increased radiation exposure, are more likely.

Civilians in space

In our latest study, we studied telomeres from the crew on board SpaceX’s 2021 Inspiration4 mission. This mission had the first all-civilian crew, whose ages spanned four decades. All of the crew members’ telomeres lengthened during the mission, and three of the four astronauts also exhibited telomere shortening once they were back on Earth.

Four people wearing black jumpsuits wave their hands in the air.
The crew members from SpaceX’s 2021 Inspiration4 mission.
SpaceX, CC BY-NC

What’s particularly interesting about these findings is that the Inspiration4 mission lasted only three days. So, not only do scientists now have consistent and reproducible data on telomeres’ response to spaceflight, but we also know it happens quickly. These results suggest that even short trips, like a weekend getaway to space, will be associated with changes in telomere length.

Scientists still don’t totally understand the health impacts of such changes in telomere length. We’ll need more research to figure out how both long and short telomeres might affect an astronaut’s long-term health.

Telomeric RNA

In another paper, we showed that the Inspiration4 crew – as well as Scott Kelly and the high-altitude mountain climbers – exhibited increased levels of telomeric RNA, termed TERRA.

Telomeres consist of lots of repetitive DNA sequences. These are transcribed into TERRA, which contributes to telomere structure and helps them do their job.

Together with laboratory studies, these findings tell us that telomeres are being damaged during spaceflight. While there is still a lot we don’t know, we do know that telomeres are especially sensitive to oxidative stress. So, the chronic oxidative that astronauts experience when exposed to space radiation around the clock likely contributes to the telomeric responses we observe.

We also wrote a review article with a more futuristic perspective of how better understanding telomeres and aging might begin to inform the ability of humans to not only survive long-duration space travel but also to thrive and even colonize other planets. Doing so would require humans to reproduce in space and future generations to grow up in space. We don’t know if that’s even possible – yet.

Plant telomeres in space

My colleagues and I contributed other work to the Space Omics and Medical Atlas package, as well, including a paper published in Nature Communications. The study team, led by Texas A&M biologist Dorothy Shippen and Ohio University biologist Sarah Wyatt, found that, unlike people, plants flown in space did not have longer telomeres during their time on board the International Space Station.

The plants did, however, ramp up their production of telomerase, the enzyme that helps maintain telomere length.

As anyone who’s seen “The Martian” knows, plants will play an essential role in long-term human survival in space. This finding suggests that plants are perhaps more naturally suited to withstand the stressors of space than humans.The Conversation

Susan Bailey, Professor of Radiation Cancer Biology and Oncology, Colorado State University

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

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The Conversation

Halloween candy binges can overload your gut microbiome – a gut doctor explains how to minimize spooking your helpful bacteria

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theconversation.com – Christopher Damman, Associate Professor of Gastroenterology, School of Medicine, of Washington – 2024-10-23 07:41:00

It’s probably best to enjoy your Halloween spoils in moderation.

Jupiterimages/The Image Bank via Getty Images

Christopher Damman, University of Washington

Each October, as the days shorten and the grows crisp, millions of Americans prepare for the beloved – and often sugar-fueled – tradition of Halloween. From jack-o’-lanterns glowing on porches to costumes ranging from the whimsical to the gory, Halloween is a time of playful scares, childhood memories and, of course, candy.

But as the wrappers pile up and the sugar rush hits, there’s something far more sinister beneath the surface: the negative effects of candy on your gut health.

Sugar and other ingredients in Halloween treats can cast a sickly spell on the trillions of microorganisms that reside in your gut, collectively known as the gut microbiome. As a gastroenterologist and gut microbiome researcher at the University of Washington School of Medicine, I have dedicated my career to decoding the cipher of how food affects this microbial community within your gut.

While no candy is truly healthy, some options are better for your gut than others. And there are ways you can wake your gut from its sugar “spell” after indulgence.

Gut-busting treats

What does all this candy do to your gut?

In a healthy , your gut microbiome acts like a microbial factory. It digests nutrients your body can’t – such as fiber and colorful, health-conferring plant compounds called polyphenols – and produces important molecules called metabolites that protect against infection and support brain health. It also regulates metabolism, or the transformation of food into useful components that power and grow cells.

A balanced diet keeps your gut’s microbial cauldron churning smoothly. But the concentrated sugar, saturated fat and additives in candy can throw things into disarray by feeding inflammatory microbes that weaken your gut barrier – the protective lining that separates your microbiome from the rest of the body.

Once the gut barrier is breached, even friendly microbes can stir up inflammation, causing health issues ranging from overweight to obesity, infections to autoimmune disease, and mild cognitive impairment to Alzheimer’s.

The food you eat shapes your gut microbes, which in turn shape your overall health.

Sugar and inflammation impair your microbiome’s ability to digest food and regulate metabolism. Instead of producing healthy byproducts – such as butyrate from fiber and urolithin A from polyphenols – candy lacking these nutrients may trick your system into storing more fat, providing less energy for your muscles and brain.

Too much candy can also affect your immune system. A healthy gut microbiome helps your immune system distinguish between friend and foe, reducing the risk of infections and autoimmune disorders. Sugar and inflammation undermine the microbiome’s role in training the immune system to distinguish between harmful invaders and harmless substances. Without a carefully calibrated immune system, your body may not effectively clear infections or may strongly react to its own cells.

Neurologically, excess sweets can also affect the gut-brain axis, the two-way communication between the gut and brain. A healthy microbiome normally produces neurotransmitters and metabolites, such as serotonin and butyrate, that influence mood and cognitive performance. Sugar and inflammation adversely affects the microbiome’s role in mental health and cognitive function, contributing to depression, anxiety and memory troubles.

The candy conundrum

Not all Halloween treats are created equal, especially when it comes to their nutritional value and effects on gut health. Sugar-coated nuts and fruit such as honey-roasted almonds and candy apples rank among the top, offering whole food just beneath the sugary coating. Packed with fiber and polyphenols, they help support gut health and healthy metabolism.

On the opposite end of the spectrum are chewy treats such as candy corn, Skittles, Starbursts and Twizzlers. These sugar-laden confections are mostly made of high fructose corn syrup, saturated fat and additives. They can increase the unsavory bacterial species in your gut and to inflammation, making them one of the least healthy Halloween choices.

Chocolate-based candies, however, stand out as a more microbiome-friendly option. While varieties such as Twix, Three Musketeers and Milky Way contain only a small amount of chocolate, pure chocolate bars – especially dark chocolate – are rich in fiber and polyphenols. In moderation, dark chocolate with at least 80% to 85% cacao may even benefit your gut microbiome and mood by encouraging beneficial bacterial species to grow.

Two green apples on a stick, coated in caramel and dusted with pecans.

Candy apples usually a serving of fruit and nuts.

Ryan Benyi Photography/Connect Images via Getty Images

Chocolates with whole nuts, such as almonds or peanuts, offer a boost of fiber, protein and omega-3 fats, making them a healthier choice. Dark chocolate with nuts is best. But when sorting through Halloween treats, Peanut M&Ms, 100 Grands and Almond Joys may be better options over Rolos, Krackels and Crunches. Even candies with processed nuts, such as Reese’s Peanut Butter Cups and Butterfingers, retain small amounts of fiber and protein, making them preferable to nut- options.

At the bottom of the list, along with chewy sugar candies, are pure sugar candies such as lollipops, Jolly Ranchers, gummies and Smarties. These sweets lack nutritional value, and their high sugar content can contribute to the growth of unhealthy bacteria in your gut microbiome.

In the end, all candies are high in sugar, which can be harmful when consumed in large quantities. Moderation and an otherwise balanced diet is key to enjoying Halloween treats.

Rebalancing after indulgence

If the microbiome is critical for health, and candy can disrupt its balance, how can you restore gut health after Halloween?

One simple strategy is focusing on the four F’s of food: fiber, phytochemicals, unsaturated fats and fermented foods. These food components can help support gut health.

Fiber-rich foods such as whole grains, nuts, seeds, beans, fruits and vegetables regulate digestion and nourish beneficial gut bacteria.

Partially unwrapped chocolate bar

Dark chocolate is a treat that may offer some health benefits.

Wachiwit/iStock via Getty Images Plus

Polyphenol-rich foods such as dark chocolate, berries, red grapes, green tea and extra virgin olive oil help reduce inflammation and encourage the growth of healthy gut bacteria.

Unsaturated fats such as omega-3 fats, walnuts, chia seeds, flaxseed, avocados and fatty fish such as salmon can also support a healthy microbiome.

Fermented foods such as sauerkraut, kimchi, yogurt, kefir and miso help replenish beneficial bacteria and restore gut balance.

To make tracking your diet easier, consider using a food calculator to measure how well your meals align with the four F’s and microbiome friendly options. Like a virtual “spellbook,” an online tool can help ensure your food choices support your gut health and ward off the effects of sugar overload.

As my daughters often remind me, it’s perfectly fine to indulge every now and then in a few tricks and treats. But remember, moderation is key. With a balanced diet, you’ll keep your gut healthy and strong long after the Halloween season ends.The Conversation

Christopher Damman, Associate Professor of Gastroenterology, School of Medicine, University of Washington

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

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Both Harris and Trump have records on space policy − an international affairs expert examines where they differ when it comes to the final frontier

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theconversation.com – Thomas G. Roberts, Postdoctoral Fellow in International Affiars, Georgia Institute of Technology – 2024-10-23 07:43:00

Neither candidate has talked much about policy on the campaign trail, but both have records to consider.

Anton Petrus/Moment via Getty Images

Thomas G. Roberts, Georgia Institute of Technology

The next president of the United States could be the first in that office to accept a phone call from the Moon and hear a woman’s voice on the line. To do so, they’ll first need to make a of strategic space policy decisions. They’ll also need a little luck.

Enormous government investment supports outer space activities, so the U.S. president has an outsize role in shaping space policy during their time in office.

Past presidents have leveraged this power to accelerate U.S. leadership in space and boost their presidential brand along the way. Presidential advocacy has helped the U.S. astronauts on the surface of the Moon, establish lasting international partnerships with civil space agencies abroad and led to many other important space milestones.

But most presidential candidates refrain from discussing space policy on the campaign trail in meaningful detail, leaving voters in the dark on their visions for the final frontier.

For many candidates, getting into the weeds of their space policy plans may be more trouble than it’s worth. For one, not every president even gets the for meaningful and memorable space policy -making, since space missions can operate on decades-long timelines. And in past elections, those who do show for space initiatives often face criticism from their opponents for their high price tags.

But the 2024 election is different. Both candidates have executive records in space policy, a rare treat for space enthusiasts casting their votes this November.

As a researcher who studies international affairs in outer space, I am interested in how those records interface with the strategic and sustainable use of that domain. A closer look shows that former President Donald Trump and Vice President Kamala Harris have used their positions to consistently prioritize U.S. leadership in space, but they have done so with noticeably different styles and results.

Trump’s space policy record

As president, Trump established a record of meaningful and lasting space policy decisions, but did so while attracting more attention to his administration’s space activities than his predecessors. He regularly took personal credit for ideas and accomplishments that predated his time in office.

The former president oversaw the establishment of the U.S. Space Force and the reestablishment of the U.S. Space Command, as well as the National Space Council. These support the and operation of military space technologies, defend national security satellites in future conflicts and coordinate between federal agencies working in the space domain.

A commander in military uniform waves a black flag with the emblem of the US Space Force (an arrow pointing up in front of a sphere representing the Earth).

While president, Donald Trump oversaw the creation of the U.S. Space Force.

AP Photo/Alex Brandon

He also had the most productive record of space policy directives in recent history. These policy directives clarify the U.S. ‘s goals in space, how it should both support and rely on the commercial space sector, track objects in Earth’s orbit and protect satellites from cyber threats.

He has called his advocacy for the creation of the Space Force one of his proudest achievements of his term. However, this advocacy contributed to polarized support for the new branch. This polarization broke the more common pattern of bipartisan public support for space programming.

Like many presidents, not all of Trump’s visions for space were realized. He successfully redirected NASA’s key human spaceflight destination from Mars back to the Moon. But his explicit goal of astronauts reaching the lunar surface by 2024 was not realistic, given his budget proposal for the agency.

Should he be elected again, the former president may wish to accelerate NASA’s Moon plans by furthering investment in the agency’s Artemis program, which houses its lunar initiatives.

He may frame the initiative as a new space race against China.

Harris’ space policy record

The Biden administration has continued to support Trump-era initiatives, resisting the temptation to undo or cancel past proposals. Its legacy in space is noticeably smaller.

As the chair of the National Space Council, Harris has set U.S. space policy priorities and represented the United States on the global stage.

A group of people gathered around a large table, with Kamala Harris standing at a podium at the front next to a screen that says 'National Space Council.'

As vice president, Harris has chaired the National Space Council.

NASA/Joel Kowsky, CC BY-NC-ND

Notably, the Trump administration kept this position that the president can alter at will assigned to the vice president, a precedent the Biden administration upheld.

In this role, Harris led the United States’ commitment to refrain from testing weapons in space that produce dangerous, long-lasting space debris. This decision marks an achievement for the U.S. in keeping space operations sustainable and setting an example for others in the international space community.

Like some Trump administration space policy priorities, not all of Harris’ proposals found footing in Washington.

The council’s plan to establish a framework for comprehensively regulating commercial space activities in the U.S., for example, stalled in Congress.

If enacted, these new regulations would have ensured that future space activities, such as private companies operating on the Moon or transporting tourists to orbit and back, pass critical safety checks.

Should she be elected, Harris may choose to continue her efforts to shape responsible norms of behavior in space and organize oversight over the space industry.

Alternatively, she could cede the portfolio to her own vice president, Minnesota Gov. Tim Walz, who has virtually no track record on space policy issues.

Stability in major space policy decisions

Despite the two candidates’ vastly different platforms, voters can expect stability in U.S. space policy as a result of this year’s election.

Given their past leadership, it is unlikely that either candidate will seek to dramatically alter the long-term missions the largest government space organizations have underway during the upcoming presidential term. And neither is likely to undercut their predecessors’ accomplishments.The Conversation

Thomas G. Roberts, Postdoctoral Fellow in International Affiars, Georgia Institute of Technology

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Women are at a higher risk of dying from heart disease − in part because doctors don’t take major sex and gender differences into account

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theconversation.com – Amy Huebschmann, Professor of Medicine, of Colorado Anschutz Medical Campus – 2024-10-22 07:45:00

Rates of heart disease and cardiac in women are often underestimated.

eternalcreative/iStock via Getty Images

Amy Huebschmann, University of Colorado Anschutz Medical Campus and Judith Regensteiner, University of Colorado Anschutz Medical Campus

A simple difference in the genetic code – two X chromosomes versus one X chromosome and one Y chromosome – can to major differences in heart disease. It turns out that these genetic differences influence more than just sex organs and sex assigned at birth – they fundamentally alter the way cardiovascular disease develops and presents.

While sex influences the mechanisms behind how cardiovascular disease develops, gender plays a role in how care providers recognize and manage it. Sex refers to biological characteristics such as genetics, hormones, anatomy and physiology, while gender refers to social, psychological and cultural constructs. Women are more likely to die after a first heart attack or stroke than . Women are also more likely to have additional or different heart attack symptoms that go beyond chest pain, such as nausea, jaw pain, dizziness and . It is often difficult to fully disentangle the influences of sex on cardiovascular disease outcomes versus the influences of gender.

While women who haven’t entered menopause have a lower risk of cardiovascular disease than men, their cardiovascular risk accelerates dramatically after menopause. In addition, if a woman has Type 2 diabetes, her risk of heart attack accelerates to be equivalent to that of men, even if the woman with diabetes has not yet gone through menopause. Further data is needed to better understand differences in cardiovascular disease risk among nonbinary and transgender patients.

Despite these differences, one key thing is the same: Heart attack, stroke and other forms of cardiovascular disease are the leading cause of death for all people, regardless of sex or gender.

We are researchers who study women’s health and the way cardiovascular disease develops and presents differently in women and men. Our work has identified a crucial need to update medical guidelines with more sex-specific approaches to diagnosis and treatment in order to improve health outcomes for all.

Gender differences in heart disease

The reasons behind sex and gender differences in cardiovascular disease are not completely known. Nor are the distinct biological effects of sex, such as hormonal and genetic factors, versus gender, such as social, cultural and psychological factors, clearly differentiated.

What researchers do know is that the accumulated evidence of what good heart care should look like for women compared with men has as many holes in it as Swiss cheese. Medical evidence for treating cardiovascular disease often comes from trials that excluded women, since women for the most part weren’t included in scientific research until the NIH Revitalization Act of 1993. For example, current guidelines to treat cardiovascular risk factors such as high blood pressure are based primarily on data from men. This is despite evidence that differences in the way that cardiovascular disease develops women to experience cardiovascular disease differently.

Clinician holding stethoscope against a patient's chest

Gender biases in health care influence the kind of tests and attention that women .

FG Trade Latin/E+ via Getty Images

In addition to sex differences, implicit gender biases among providers and gendered social norms among patients lead clinicians to underestimate the risk of cardiac events in women with men. These biases play a role in why women are more likely than men to die from cardiac events. For example, for patients with symptoms that are borderline for cardiovascular disease, clinicians tend to be more aggressive in ordering artery imaging for men than for women. One study linked this tendency to order less aggressive tests for women partly to a gender bias that men are more open than women to taking risks.

In a study of about 3,000 patients with a recent heart attack, women were less likely than men to think that their heart attack symptoms were due to a heart condition. Additionally, most women do not know that cardiovascular disease is the No. 1 cause of death among women. Overall, women’s misperceptions of their own risk may hold them back from getting a doctor to check out possible symptoms of a heart attack or stroke.

These issues are further exacerbated for women of color. Lack of access to health care and additional challenges drive health disparities among underrepresented racial and ethnic minority populations.

Sex difference in heart disease

Cardiovascular disease physically looks different for women and men, specifically in the plaque buildup on artery walls that contributes to illness.

Women have fewer cholesterol crystals and fewer calcium deposits in their artery plaque than men do. Physiological differences in the smallest blood vessels feeding the heart also play a role in cardiovascular outcomes.

Women are more likely than men to have cardiovascular disease that presents as multiple narrowed arteries that are not fully “clogged,” resulting in chest pain because blood flow can’t ratchet up enough to meet higher oxygen demands with exercise, much like a low-flow showerhead. When chest pain presents in this way, doctors call this condition ischemia and no obstructive coronary arteries. In comparison, men are more likely to have a “clogged” artery in a concentrated area that can be opened up with a stent or with cardiac bypass surgery. Options for multiple narrowed arteries have lagged behind treatment options for typical “clogged” arteries, which puts women at a disadvantage.

In addition, in the early stages of a heart attack, the levels of blood markers that indicate to the heart are lower in women than in men. This can lead to more missed diagnoses of coronary artery disease in women compared with men.

The reasons for these differences are not fully clear. Some potential factors include differences in artery plaque composition that make men’s plaque more likely to rupture or burst and women’s plaque more likely to erode. Women also have lower heart mass and smaller arteries than men even after taking body size into consideration.

Reducing sex disparities

Too often, women with symptoms of cardiovascular disease are sent away from doctor’s offices because of gender biases that “women don’t get heart disease.”

Considering how symptoms of cardiovascular disease vary by sex and gender could help doctors better care for all patients.

One way that the rubber is meeting the road is with regard to better approaches to diagnosing heart attacks for women and men. Specifically, when diagnosing heart attacks, using sex-specific cutoffs for blood tests that measure heart damage – called high-sensitivity troponin tests – can improve their accuracy, decreasing missed diagnoses, or false negatives, in women while also decreasing overdiagnoses, or false positives, in men.

Our research laboratory’s leaders,collaborators and other internationally recognized research colleagues – some of whom partner with our Ludeman Family Center for Women’s Health Research on the University of Colorado Anschutz Medical Campus – will continue this important work to close this gap between the sexes in health care. Research in this field is critical to shine a light on ways clinicians can better address sex-specific symptoms and to bring forward more tailored treatments.

The Biden administration’s recent executive order to advance women’s health research is paving the way for research to go beyond just understanding what causes sex differences in cardiovascular disease. Developing and testing right-sized approaches to care for each patient can help achieve better health for all.The Conversation

Amy Huebschmann, Professor of Medicine, University of Colorado Anschutz Medical Campus and Judith Regensteiner, Professor of Medicine, University of Colorado Anschutz Medical Campus

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