The Diet Compass – by Bas Kast
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Facts about nutrition and health can be hard to memorize. There’s just so much! And often there are so many studies, and while the science is not usually contradictory, pop-science headlines sure can be. What to believe?
Bas Kast brings us a very comprehensive and easily digestible solution.
A science journalist himself, he has gone through the studies so that you don’t have to, and—citing them along the way—draws out the salient points and conclusions.
But, he’s not just handing out directions (though he does that too); he’s arranged and formatted the information in a very readable and logical fashion. Chapter by chapter, we learn the foundations of important principles for “this is better than that” choices in diet.
Most importantly, he lays out for us his “12 simple rules for healthy eating“, and they are indeed as simple as they are well-grounded in good science.
Bottom line: if you want “one easy-reading book” to just tell you how to make decisions about your diet, simply follow those rules and enjoy the benefits… Then this book is exactly that.
Click here to check out The Diet Compass and get your diet on the right track!
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How light can shift your mood and mental health
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This is the next article in our ‘Light and health’ series, where we look at how light affects our physical and mental health in sometimes surprising ways. Read other articles in the series.
It’s spring and you’ve probably noticed a change in when the Sun rises and sets. But have you also noticed a change in your mood?
We’ve known for a while that light plays a role in our wellbeing. Many of us tend to feel more positive when spring returns.
But for others, big changes in light, such as at the start of spring, can be tough. And for many, bright light at night can be a problem. Here’s what’s going on.
llaszlo/Shutterstock An ancient rhythm of light and mood
In an earlier article in our series, we learned that light shining on the back of the eye sends “timing signals” to the brain and the master clock of the circadian system. This clock coordinates our daily (circadian) rhythms.
“Clock genes” also regulate circadian rhythms. These genes control the timing of when many other genes turn on and off during the 24-hour, light-dark cycle.
But how is this all linked with our mood and mental health?
Circadian rhythms can be disrupted. This can happen if there are problems with how the body clock develops or functions, or if someone is routinely exposed to bright light at night.
When circadian disruption happens, it increases the risk of certain mental disorders. These include bipolar disorder and atypical depression (a type of depression when someone is extra sleepy and has problems with their energy and metabolism).
Light on the brain
Light may also affect circuits in the brain that control mood, as animal studies show.
There’s evidence this happens in humans. A brain-imaging study showed exposure to bright light in the daytime while inside the scanner changed the activity of a brain region involved in mood and alertness.
Another brain-imaging study found a link between daily exposure to sunlight and how the neurotransmitter (or chemical messenger) serotonin binds to receptors in the brain. We see alterations in serotonin binding in several mental disorders, including depression.
Our mood can lift in sunlight for a number of reasons, related to our genes, brain and hormones. New Africa/Shutterstock What happens when the seasons change?
Light can also affect mood and mental health as the seasons change. During autumn and winter, symptoms such as low mood and fatigue can develop. But often, once spring and summer come round, these symptoms go away. This is called “seasonality” or, when severe, “seasonal affective disorder”.
What is less well known is that for other people, the change to spring and summer (when there is more light) can also come with a change in mood and mental health. Some people experience increases in energy and the drive to be active. This is positive for some but can be seriously destabilising for others. This too is an example of seasonality.
Most people aren’t very seasonal. But for those who are, seasonality has a genetic component. Relatives of people with seasonal affective disorder are more likely to also experience seasonality.
Seasonality is also more common in conditions such as bipolar disorder. For many people with such conditions, the shift into shorter day-lengths during winter can trigger a depressive episode.
Counterintuitively, the longer day-lengths in spring and summer can also destabilise people with bipolar disorder into an “activated” state where energy and activity are in overdrive, and symptoms are harder to manage. So, seasonality can be serious.
Alexis Hutcheon, who experiences seasonality and helped write this article, told us:
[…] the season change is like preparing for battle – I never know what’s coming, and I rarely come out unscathed. I’ve experienced both hypomanic and depressive episodes triggered by the season change, but regardless of whether I’m on the ‘up’ or the ‘down’, the one constant is that I can’t sleep. To manage, I try to stick to a strict routine, tweak medication, maximise my exposure to light, and always stay tuned in to those subtle shifts in mood. It’s a time of heightened awareness and trying to stay one step ahead.
So what’s going on in the brain?
One explanation for what’s going on in the brain when mental health fluctuates with the change in seasons relates to the neurotransmitters serotonin and dopamine.
Serotonin helps regulate mood and is the target of many antidepressants. There is some evidence of seasonal changes in serotonin levels, potentially being lower in winter.
Dopamine is a neurotransmitter involved in reward, motivation and movement, and is also a target of some antidepressants. Levels of dopamine may also change with the seasons.
But the neuroscience of seasonality is a developing area and more research is needed to know what’s going on in the brain.
How about bright light at night?
We know exposure to bright light at night (for instance, if someone is up all night) can disturb someone’s circadian rhythms.
This type of circadian rhythm disturbance is associated with higher rates of symptoms including self-harm, depressive and anxiety symptoms, and lower wellbeing. It is also associated with higher rates of mental disorders, such as major depression, bipolar disorder, psychotic disorders and post-traumatic stress disorder (or PTSD).
Why is this? Bright light at night confuses and destabilises the body clock. It disrupts the rhythmic regulation of mood, cognition, appetite, metabolism and many other mental processes.
But people differ hugely in their sensitivity to light. While still a hypothesis, people who are most sensitive to light may be the most vulnerable to body clock disturbances caused by bright light at night, which then leads to a higher risk of mental health problems.
Bright light at night disrupts your body clock, putting you at greater risk of mental health issues. Ollyy/Shutterstock Where to from here?
Learning about light will help people better manage their mental health conditions.
By encouraging people to better align their lives to the light-dark cycle (to stabilise their body clock) we may also help prevent conditions such as depression and bipolar disorder emerging in the first place.
Healthy light behaviours – avoiding light at night and seeking light during the day – are good for everyone. But they might be especially helpful for people at risk of mental health problems. These include people with a family history of mental health problems or people who are night owls (late sleepers and late risers), who are more at risk of body clock disturbances.
Alexis Hutcheon has lived experience of a mental health condition and helped write this article.
If this article has raised issues for you, or if you’re concerned about someone you know, call Lifeline on 13 11 14.
Jacob Crouse, Research Fellow in Youth Mental Health, Brain and Mind Centre, University of Sydney; Emiliana Tonini, Postdoctoral Research Fellow, Brain and Mind Centre, University of Sydney, and Ian Hickie, Co-Director, Health and Policy, Brain and Mind Centre, University of Sydney
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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Body by Science – by Dr. Doug McGuff & John Little
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The idea that you’ll get a re-sculpted body at 12 minutes per week is a bold claim, isn’t it? Medical Doctor Doug McGuff and bodybuilder John Little team up to lay out their case. So, how does it stand up to scrutiny?
First, is it “backed by rigorous research” as claimed? Yes… with caveats.
The book uses a large body of scientific literature as its foundation, and that weight of evidence does support this general approach:
- Endurance cardio isn’t very good at burning fat
- Muscle, even just having it without using it much, burns fat to maintain it
- To that end, muscle can be viewed as a fat-burning asset
- Muscle can be grown quickly with short bursts of intense exercise once per week
Why once per week? The most relevant muscle fibers take about that long to recover, so doing it more often will undercut gains.
So, what are the caveats?
The authors argue for slow reps of maximally heavy resistance work sufficient to cause failure in about 90 seconds. However, most of the studies cited for the benefits of “brief intense exercise” are for High Intensity Interval Training (HIIT). HIIT involves “sprints” of exercise. It doesn’t have to be literally running, but for example maxing out on an exercise bike for 30 seconds, slowing for 60, maxing out for 30, etc. Or in the case of resistance work, explosive (fast!) concentric movements and slow eccentric movements, to work fast- and slow-twitch muscle fibers, respectively.
What does this mean for the usefulness of the book?
- Will it sculpt your body as described in the blurb? Yes, this will indeed grow your muscles with a minimal expenditure of time
- Will it improve your body’s fat-burning metabolism? Yes, this will indeed turn your body into a fat-burning machine
- Will it improve your “complete fitness”? No, if you want to be an all-rounder athlete, you will still need HIIT, as otherwise anything taxing your under-worked fast-twitch muscle fibers will exhaust you quickly.
Bottom line: read this book if you want to build muscle efficiently, and make your body more efficient at burning fat. Best supplemented with at least some cardio, though!
Click here to check out Body by Science, and get re-sculpting yours!
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Meals That Heal – by Dr. Carolyn Williams
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Inflammation is implicated as a contributory or casual factor in almost all chronic diseases (and still exacerbates the ones in which it’s not directly implicated causally), so if there’s one area of health to focus on with one’s diet, then reducing inflammation is a top candidate.
This book sets about doing exactly that.
You may be wondering whether, per the book’s subtitle, they can really all be done in 30 minutes or under. The answer is: no, not unless you have a team of sous-chefs to do all the prep work for you, and line up everything mise-en-place style for when you start the clock. If you do have that team of sous-chefs working for you, then you can probably do most of them in under 30 minutes. If you don’t have that team, then budget about an hour in total, sometimes less, sometimes more, depending on the recipe.
The recipes themselves are mostly Mediterranean-inspired, though you might want to do a few swaps where the author has oddly recommended using seed oils instead of olive oil, or plant milk in place of where she has used dairy milk in a couple of “recipes” for smoothies. You might also want to be a little more generous with the seasonings, if you’re anything like this reviewer.
Bottom line: if you’re looking for an anti-inflammatory starter cookbook, you could do worse than this. You could probably do better, too, such as starting with The Inflammation Spectrum – by Dr. Will Cole.
Alternatively, click here if you want to check out Meals That Heal, and dive straight in!
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Yes, we still need chickenpox vaccines
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For people who grew up before a vaccine was available, chickenpox is largely remembered as an unpleasant experience that almost every child suffered through. The highly contagious disease tore through communities, leaving behind more than a few lasting scars.
For many children, chickenpox was much more than a week or two of itchy discomfort. It was a serious and sometimes life-threatening infection.
Prior to the chickenpox vaccine’s introduction in 1995, 90 percent of children got chickenpox. Those children grew into adults with an increased risk of developing shingles, a disease caused by the same virus—varicella-zoster—as chickenpox, which lies dormant in the body for decades.
The vaccine changed all that, nearly wiping out chickenpox in the U.S. in under three decades. The vaccine has been so successful that some people falsely believe the disease no longer exists and that vaccination is unnecessary. This couldn’t be further from the truth.
Vaccination spares children and adults from the misery of chickenpox and the serious short- and long-term risks associated with the disease. The CDC estimates that 93 percent of children in the U.S. are fully vaccinated against chickenpox. However, outbreaks can still occur among unvaccinated and under-vaccinated populations.
Here are some of the many reasons why we still need chickenpox vaccines.
Chickenpox is more serious than you may remember
For most children, chickenpox lasts around a week. Symptoms vary in severity but typically include a rash of small, itchy blisters that scab over, fever, fatigue, and headache.
However, in one out of every 4,000 chickenpox cases, the virus infects the brain, causing swelling. If the varicella-zoster virus makes it to the part of the brain that controls balance and muscle movements, it can cause a temporary loss of muscle control in the limbs that can last for months. Chickenpox can also cause other serious complications, including skin, lung, and blood infections.
Prior to the U.S.’ approval of the vaccine in 1995, children accounted for most of the country’s chickenpox cases, with over 10,000 U.S. children hospitalized with chickenpox each year.
The chickenpox vaccine is very effective and safe
Chickenpox is an extremely contagious disease. People without immunity have a 90 percent chance of contracting the virus if exposed.
Fortunately, the chickenpox vaccine provides lifetime protection and is around 90 percent effective against infection and nearly 100 percent effective against severe illness. It also reduces the risk of developing shingles later in life.
In addition to being incredibly effective, the chickenpox vaccine is very safe, and serious side effects are extremely rare. Some people may experience mild side effects after vaccination, such as pain at the injection site and a low fever.
Although infection provides immunity against future chickenpox infections, letting children catch chickenpox to build up immunity is never worth the risk, especially when a safe vaccine is available. The purpose of vaccination is to gain immunity without serious risk.
The chickenpox vaccine is one of the greatest vaccine success stories in history
It’s difficult to overstate the impact of the chickenpox vaccine. Within five years of the U.S. beginning universal vaccination against chickenpox, the disease had declined by over 80 percent in some regions.
Nearly 30 years after the introduction of the chickenpox vaccine, the disease is almost completely wiped out. Cases and hospitalizations have plummeted by 97 percent, and chickenpox deaths among people under 20 are essentially nonexistent.
Thanks to the vaccine, in less than a generation, a disease that once swept through schools and affected nearly every child has been nearly eliminated. And, unlike vaccines introduced in the early 20th century, no one can argue that improved hygiene, sanitation, and health helped reduce chickenpox cases beginning in the 1990s.
Having chickenpox as a child puts you at risk of shingles later
Although most people recover from chickenpox within a week or two, the virus that causes the disease, varicella-zoster, remains dormant in the body. This latent virus can reactivate years after the original infection as shingles, a tingling or burning rash that can cause severe pain and nerve damage.
One in 10 people who have chickenpox will develop shingles later in life. The risk increases as people get older as well as for those with weakened immune systems.
Getting chickenpox as an adult can be deadly
Although chickenpox is generally considered a childhood disease, it can affect unvaccinated people of any age. In fact, adult chickenpox is far deadlier than pediatric cases.
Serious complications like pneumonia and brain swelling are more common in adults than in children with chickenpox. One in 400 adults who get chickenpox develops pneumonia, and one to two out of 1,000 develop brain swelling.
Vaccines have virtually eliminated chickenpox, but outbreaks still happen
Although the chickenpox vaccine has dramatically reduced the impact of a once widespread disease, declining immunity could lead to future outbreaks. A Centers for Disease Control and Prevention analysis found that chickenpox vaccination rates dropped in half of U.S. states in the 2022-2023 school year compared to the previous year. And more than a dozen states have immunization rates below 90 percent.
In 2024, New York City and Florida had chickenpox outbreaks that primarily affected unvaccinated and under-vaccinated children. With declining public confidence in routine vaccines and rising school vaccine exemption rates, these types of outbreaks will likely become more common.
The CDC recommends that children receive two chickenpox vaccine doses before age 6. Older children and adults who are unvaccinated and have never had chickenpox should also receive two doses of the vaccine.
For more information, talk to your health care provider.
This article first appeared on Public Good News and is republished here under a Creative Commons license.
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Beating Toxic Positivity
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How To Get Your Brain On A More Positive Track (Without Toxic Positivity)
There have been many studies done regards optimism and health, and they generally come to the same conclusion: optimism is simply good for the health.
Here’s an example we’ve mentioned before, but it’s a good introduction to today’s main feature. It’s a longitudinal study, and it followed 121,700 women (what a sample size!) for eight years. It controlled for all kinds of other lifestyle factors (especially smoking, drinking, diet, and exercise habits, as well as pre-existing medical conditions), so this wasn’t a case of “people who are healthy are more optimistic as results. And, in the researchers’ own words…
❝We found strong and statistically significant associations of increasing levels of optimism with decreasing risks of mortality, including mortality due each major cause of death, such as cancer, heart disease, stroke, respiratory disease, and infection. Importantly, findings were maintained after close control for potential confounding factors, including sociodemographic characteristics and depression❞
Read: Optimism and Cause-Specific Mortality: A Prospective Cohort Study
And yet, toxic positivity can cause as many problems as it tries to fix.
What is toxic positivity?
- Toxic positivity is the well-meaning friend who says “I’m sure it’ll be ok” when you know full well it definitely will not.
- Toxic positivity is the allegorical frog-in-a-pan saying that the temperature rises due to climate change are gradual, so they’re nothing to worry about
- Toxic positivity is thinking that “good vibes” will outperform chemotherapy
Sometimes, a dose of realism is needed. So, can we do that and maintain a positive attitude?
The answer is: somewhat, yes! But first, a quick check-in:
❝I’m not a pessimist; I’m a realist!❞
~ every pessimist ever
To believe self-reports, the world is divided between optimists and realists. But how does your outlook measure up, really?
While like most free online tests, this is offered “as-is” with the usual caveats about not being a clinical diagnostic tool, this one actually has a fair amount of scientific weight behind it:
❝Empirical testing has indicated the validity of the Optimism Pessimism Instrument as published in the scientific journal Current Psychology: Research and Reviews.
The IDRlabs Optimism/Pessimism Test (IDR-OPT) was developed by IDRlabs. The IDR-OPT is based on the Optimism/Pessimism Instrument (OPI) developed by Dr. William Dember, Dr. Stephanie Martin, Dr. Mary Hummer, Dr. Steven Howe, and Dr. Richard Melton, at the University of Cincinnati.❞
Take This Short (1–2 mins) Test
How did you score? And what could you do to improve on that score?
First, it’s said that with a big enough “why”, one can overcome any “how”. So…
An attitude of gratitude
We know, we know, it’s very Oprah Winfrey. But also, it works. Take the time, ideally daily, to quickly list 3–5 things for which you feel grateful. Great or small, it can be anything from your spouse to your cup of coffee, provided you feel fortunate to have it.
How this works: our brains easily get stuck in loops, so it can help to nudge them into a more positive loop.
What about when we are treated unfairly? Are we supposed to be grateful?
Sometimes, our less positive emotions are necessary, to protect us and/or those around us, and to provide a motivational force. We can still maintain a positive attitude by noting the bad thing and some good, but watch out! Notice the difference:
- “How dare they take our healthcare away, but at least I’m not sick right now” (lasting impression: no action required)
- “At least I’m not sick right now, but how dare they take our healthcare away!” (lasting impression: action required)
It’s a well-known idea in neurolinguistic programming, that “but” negates whatever goes before it (think of “I’m sorry but”, or “I’m not racist but”, etc), so use it consciously and wisely, or else simply use “and” instead.
Cognitive reframing: problem, or opportunity?
Most problems can be opportunities, even if the problems themselves genuinely suck and are not intrinsically positive. A way of leveraging this can be replacing “I have to…” with “I get to…”.
This not only can reframe problems as opportunities, but also calls back to the gratitude idea.
- Instead of “I have to get my mammogram / prostate exam” (not generally considered fun activities), “I get to have the peace of mind of being free from cancer / I get to have the forewarning that will keep me safe”.
- Instead of “I have to go to work”, “I get to go to work” (many wish they were in your shoes!)
- Instead of “I have to rest”, “I get to rest”
When things are truly not great
Whether due to internal or external factors, whether you can control something or not, sometimes things are truly not great. The trick here is that in most contexts, one can replace negative talk, with verbally positive talk, no matter how dripping with scathing irony. You’ll still get to express the idea you wanted, but your brain will feel more positive and you’ll be in a positive loop rather than a negative one.
This, by the way, is the inverse of talking to a dog with a tone of voice that is completely the opposite of the meaning of the words. Whereas the dog will interpret the tone only, your brain will interpret the words only.
- You just spilled your drink over yourself at a social function? “Aren’t I the very model of grace and charm?”
- You made a costly mistake in your business dealings? “I am such a genius”
- You just got a diagnosis of a terrible disease? “Well, this is fabulous”
None of these things involve burying your head in the sand, in the manner of toxic positivity. You’ll still learn from your business mistake and correct it as best you can, or take appropriate action regards the disease, for example.
You’ll just feel better while you do it, and not get caught into a negative spiral that ruins your day, or even your next few months.
Sympathetic/Somatic Therapy:
Lastly, an easy one, leveraging the body’s tendency to get in sync with things around us:
For when you do just need a mood change, have an uplifting playlist available at the touch of a button. It’s hard to be consumed with counterproductive feelings to the tune of “Walking on Sunshine”!
Bonus tip: consider having the playlist start with something that is lyrically negative while musically upbeat. That way, your brain won’t resist it as antithetical to your mood, and by the second track, you’ll already be on your way to a better mood.
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People on Ozempic may have fewer heart attacks, strokes and addictions – but more nausea, vomiting and stomach pain
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Ozempic and Wegovy are increasingly available in Australia and worldwide to treat type 2 diabetes and obesity.
The dramatic effects of these drugs, known as GLP-1s, on weight loss have sparked huge public interest in this new treatment option.
However, the risks and benefits are still being actively studied.
In a new study in Nature Medicine, researchers from the United States reviewed health data from about 2.4 million people who have type 2 diabetes, including around 216,000 people who used a GLP-1 drug, between 2017 and 2023.
The researchers compared a range of health outcomes when GLP-1s were added to a person’s treatment plan, versus managing their diabetes in other ways, often using glucose-lowering medications.
Overall, they found people who used GLP-1s were less likely to experience 42 health conditions or adverse health events – but more likely to face 19 others.
myskin/Shutterstock What conditions were less common?
Cardiometabolic conditions
GLP-1 use was associated with fewer serious cardiovascular and coagulation disorders. This includes deep vein thrombosis, pulmonary embolism, stroke, cardiac arrest, heart failure and myocardial infarction.
Neurological and psychiatric conditions
GLP-1 use was associated with fewer reported substance use disorders or addictions, psychotic disorders and seizures.
Infectious conditions
GLP-1 use was associated with fewer bacterial infections and pneumonia.
What conditions were more common?
Gastrointestinal conditions
Consistent with prior studies, GLP-1 use was associated with gastrointestinal conditions such as nausea, vomiting, gastritis, diverticulitis and abdominal pain.
Other adverse effects
Increased risks were seen for conditions such as low blood pressure, syncope (fainting) and arthritis.
People who took Ozempic were more likely to experience stomach upsets than those who used other type 2 diabetes treatments. Douglas Cliff/Shutterstock How robust is this study?
The study used a large and reputable dataset from the US Department of Veterans Affairs. It’s an observational study, meaning the researchers tracked health outcomes over time without changing anyone’s treatment plan.
A strength of the study is it captures data from more than 2.4 million people across more than six years. This is much longer than what is typically feasible in an intervention study.
Observational studies like this are also thought to be more reflective of the “real world”, because participants aren’t asked to follow instructions to change their behaviour in unnatural or forced ways, as they are in intervention studies.
However, this study cannot say for sure that GLP-1 use was the cause of the change in risk of different health outcomes. Such conclusions can only be confidently made from tightly controlled intervention studies, where researchers actively change or control the treatment or behaviour.
The authors note the data used in this study comes from predominantly older, white men so the findings may not apply to other groups.
Also, the large number of participants means that even very small effects can be detected, but they might not actually make a real difference in overall population health.
Observational studies track outcomes over time, but can’t say what caused the changes. Jacob Lund/Shutterstock Other possible reasons for these links
Beyond the effect of GLP-1 in the body, other factors may explain some of the findings in this study. For example, it’s possible that:
- people who used GLP-1 could be more informed about treatment options and more motivated to manage their own health
- people who used GLP-1 may have received it because their health-care team were motivated to offer the latest treatment options, which could lead to better care in other areas that impact the risk of various health outcomes
- people who used GLP-1 may have been able to do so because they lived in metropolitan centres and could afford the medication, as well as other health-promoting services and products, such as gyms, mental health care, or healthy food delivery services.
Did the authors have any conflicts of interest?
Two of the study’s authors declared they were “uncompensated consultants” for Pfizer, a global pharmaceutical company known for developing a wide range of medicines and vaccines. While Pfizer does not currently make readily available GLP-1s such as Ozempic or Wegovy, they are attempting to develop their own GLP-1s, so may benefit from greater demand for these drugs.
This research was funded by the US Department of Veterans Affairs, a government agency that provides a wide range of services to military veterans.
No other competing interests were reported.
Diabetes vs weight-loss treatments
Overall, this study shows people with type 2 diabetes using GLP-1 medication generally have more positive health outcomes than negative health outcomes.
However, the study didn’t include people without type 2 diabetes. More research is needed to understand the effects of these medications in people without diabetes who are using them for other reasons, including weight loss.
While the findings highlight the therapeutic benefits of GLP-1 medications, they also raise important questions about how to manage the potential risks for those who choose to use this medication.
The findings of this study can help many people, including:
- policymakers looking at ways to make GLP-1 medications more widely available for people with various health conditions
- health professionals who have regular discussions with patients considering GLP-1 use
- individuals considering whether a GLP-1 medication is right for them.
Lauren Ball, Professor of Community Health and Wellbeing, The University of Queensland and Emily Burch, Accredited Practising Dietitian and Lecturer, Southern Cross University
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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