Olive oil is healthy. Turns out olive leaf extract may be good for us too
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Olive oil is synonymous with the Mediterranean diet, and the health benefits of both are well documented.
Olive oil reduces the risk of heart disease, cancer, diabetes and premature death. Olives also contain numerous healthy nutrients.
Now evidence is mounting about the health benefits of olive leaves, including from studies in a recent review.
Here’s what’s in olive leaves and who might benefit from taking olive leaf extract.
What’s in olive leaves?
Olive leaves have traditionally been brewed as a tea in the Mediterranean and drunk to treat fever and malaria.
The leaves contain high levels of a type of antioxidant called oleuropein. Olives and olive oil contain this too, but at lower levels.
Generally, the greener the leaf (the less yellowish) the more oleuropein it contains. Leaves picked in spring also have higher levels compared to ones picked in autumn, indicating levels of oleuropein reduce as the leaves get older.
Olive leaves also contain other antioxidants such as hydroxytyrosol, luteolin, apigenin and verbascoside.
Antioxidants work by reducing the oxidative stress in the body. Oxidative stress causes damage to our DNA, cell membranes and tissues, which can lead to chronic diseases such as cancer and heart disease.
Are olive leaves healthy?
One review and analysis combined data from 12 experimental studies with 819 participants in total. Overall, olive leaf extract improved risk factors for heart disease. This included healthier blood lipids (fats) and lowering blood pressure.
The effect was greater for people who already had high blood pressure.
Most studies in this review gave olive leaf extract as a capsule, with daily doses of 500 milligrams to 5 grams for six to 48 weeks.
Another review and analysis published late last year looked at data from 12 experimental studies, with a total of 703 people. Some of these studies involved people with high blood lipids, people with high blood pressure, people who were overweight or obese, and some involved healthy people.
Daily doses were 250-1,000mg taken as tablets or baked into bread.
Individual studies in the review showed significant benefits in improving blood glucose (sugar) control, blood lipid levels and reducing blood pressure. But when all the data was combined, there were no significant health effects. We’ll explain why this may be the case shortly.
Another review looked at people who took oleuropein and hydroxytyrosol (the antioxidants in olive leaves). This found significant improvement in body weight, blood lipid profiles, glucose metabolism and improvements in bones, joints and cognitive function.
The individual studies included tested either the two antioxidants or olive leaf incorporated into foods such as bread and cooking oils (but not olive oil). The doses were 6-500mg per day of olive leaf extract.
So what can we make of these studies overall? They show olive leaf extract may help reduce blood pressure, improve blood lipids and help our bodies handle glucose.
But these studies show inconsistent results. This is likely due to differences in the way people took olive leaf extract, how much they took and how long for. This type of inconsistency normally tells us we need some more research to clarify the health effects of olive leaves.
Can you eat olive leaves?
Olive leaves can be brewed into a tea, or the leaves added to salads. Others report grinding olive leaves into smoothies.
However the leaves are bitter, because of the antioxidants, which can make them hard to eat, or the tea unpalatable.
Olive leaf extract has also been added to bread and other baked goods. Researchers find this improves the level of antioxidants in these products and people say the foods tasted better.
Is olive leaf extract toxic?
No, there seem to be no reported toxic effects of eating or drinking olive leaf extract.
It appears safe up to 1g a day, according to studies that have used olive leaf extract. However, there are no official guidelines about how much is safe to consume.
There have been reports of potential toxicity if taken over 85mg/kg of body weight per day. For an 80kg adult, this would mean 6.8g a day, well above the dose used in the studies mentioned in this article.
Pregnant and breastfeeding women are recommended not to consume it as we don’t know if it’s safe for them.
What should I do?
If you have high blood pressure, diabetes or raised blood lipids you may see some benefit from taking olive leaf extract. But it is important you discuss this with your doctor first and not change any medications or start taking olive leaf extract until you have spoken to them.
But there are plenty of antioxidants in all plant foods, and you should try to eat a wide variety of different coloured plant foods. This will allow you to get a range of nutrients and antioxidants.
Olive leaf and its extract is not going to be a panacea for your health if you’re not eating a healthy diet and following other health advice.
Evangeline Mantzioris, Program Director of Nutrition and Food Sciences, Accredited Practising Dietitian, University of South Australia
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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Ozempic Helps People Walk Further
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There’s often a catch-22 when it comes to exercise: it’s important for good health, and/but people with ill health usually cannot exercise much.
A recent (published today, at time of writing, the 29th of March 2025, never let it be said we don’t bring you the very most up-to-date health science!) study by Dr. Neda Rasouli et al. has shown there is a possible way through that catch-22, depending on the nature of the illness.
This study followed 792 people across 112 outpatient clinical trial sites in 20 countries in North America, Asia, and Europe, with type 2 diabetes and peripheral artery disease.
What they found
Patients taking semaglutide (specifically, 1mg Ozempic) enjoyed a 21% median increase in walking distance, as well as some bonus benefits, namely:
- Weight reduction: the semaglutide group saw a greater reduction in body weight (–4.1 kg; P < 0 .0001)
- HbA1c levels: semaglutide lowered HbA1c by 1 percentage point (P < 0.0001)
- Blood pressure: systolic blood pressure decreased by 3.2 mmHg (P = 0.0042)
You may be wondering what that “P =” means: it’s the probability of this occurring by random chance, on a scale from zero (impossible outcome) to 1 (unavoidable outcome).
For example:
“We hypothesized that singing the happy birthday song before tossing a coin would result in it landing on heads. We sang the happy birthday song and tossed the coin; it landed on heads (P = 0.5)”
In science, generally speaking anything with a probability of under 0.05 (expressed as: “P < 0.05”) is considered a statistically significant result.
All this to say, the cited figures of, for example, P < 0.0001, are very significant indeed.
On which note, that 21% median increase in walking distance? P < 0.0004.
As for side effects? Serious adverse events related to the drug occurred in 1% of the semaglutide group vs 2% in the placebo group. So, that seems quite safe indeed.
You can find the paper itself here:
Want to learn more?
Check out:
- The Doctor Who Wants Us To Exercise Less, & Move More
- Walking… Better.
- 5 Ways To Naturally Boost The “Ozempic Effect”
Take care!
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The Truth About Handwashing
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Washing Our Hands Of It
In Tuesdays’s newsletter, we asked you how often you wash your hands, and got the above-depicted, below-described, set of self-reported answers:
- About 54% said “More times per day than [the other options]”
- About 38% said “Whenever using the bathroom or kitchen
- About 5% said “Once or twice per day”
- Two (2) said “Only when visibly dirty”
- Two (2) said “I prefer to just use sanitizer gel”
What does the science have to say about this?
People lie about their handwashing habits: True or False?
True and False (since some people lie and some don’t), but there’s science to this too. Here’s a great study from 2021 that used various levels of confidentiality in questioning (i.e., there were ways of asking that made it either obvious or impossible to know who answered how), and found…
❝We analysed data of 1434 participants. In the direct questioning group 94.5% of the participants claimed to practice proper hand hygiene; in the indirect questioning group a significantly lower estimate of only 78.1% was observed.❞
Note: the abstract alone doesn’t make it clear how the anonymization worked (it is explained later in the paper), and it was noted as a limitation of the study that the participants may not have understood how it works well enough to have confidence in it, meaning that the 78.1% is probably also inflated, just not as much as the 94.5% in the direct questioning group.
Here’s a pop-science article that cites a collection of studies, finding such things as for example…
❝With the use of wireless devices to record how many people entered the restroom and used the pumps of the soap dispensers, researchers were able to collect data on almost 200,000 restroom trips over a three-month period.
The found that only 31% of men and 65% of women washed their hands with soap.❞
Source: Study: Men Wash Their Hands Much Less Often Than Women (And People Lie About Washing Their Hands)
Sanitizer gel does the job of washing one’s hands with soap: True or False?
False, though it’s still not a bad option for when soap and water aren’t available or practical. Here’s an educational article about the science of why this is so:
UCI Health | Soap vs. Hand Sanitizer
There’s also some consideration of lab results vs real-world results, because while in principle the alcohol gel is very good at killing most bacteria / inactivating most viruses, it can take up to 4 minutes of alcohol gel contact to do so, as in this study with flu viruses:
In contrast, 20 seconds of handwashing with soap will generally do the job.
Antibacterial soap is better than other soap: True or False?
False, because the main way that soap protects us is not in its antibacterial properties (although it does also destroy the surface membrane of some bacteria and for that matter viruses too, killing/inactivating them, respectively), but rather in how it causes pathogens to simply slide off during washing.
Here’s a study that found that handwashing with soap reduced disease incidence by 50–53%, and…
❝Incidence of disease did not differ significantly between households given plain soap compared with those given antibacterial soap.❞
Read more: Effect of handwashing on child health: a randomised controlled trial
Want to wash your hands more than you do?
There have been many studies into motivating people to wash their hands more (often with education and/or disgust-based shaming), but an effective method you can use for yourself at home is to simply buy more luxurious hand soap, and generally do what you can to make handwashing a more pleasant experience (taking a moment to let the water run warm is another good thing to do if that’s more comfortable for you).
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The Longevity Project – by Dr. Howard Friedman & Dr. Leslie Martin
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Most books on the topic of longevity focus on such things as diet and exercise, and indeed, those are of course important things. But what of psychological and sociological factors?
Dr. Friedman and Dr. Martin look at a landmark longitudinal study, following a large group of subjects from childhood into old age. Looking at many lifestyle factors and life events, they crunched the numbers to see what things really made the biggest impact on healthy longevity.
A strength of the book is that this study had a huge amount of data—a limitation of the book is that it often avoids giving that concrete data, preferring to say “many”, “a majority”, “a large minority”, “some”, and so forth.
However, the conclusions from the data seem clear, and include many observations such as:
- conscientiousness is a characteristic that not only promotes healthy long life, but also can be acquired as time goes by (some “carefree” children became “conscientious” adults)
- resilience is a characteristic that promotes healthy long life—but tends to only be “unlocked” by adversity
- men tend to live longer if married—women, not so much
- religion and spirituality are not big factors in healthy longevity—but social connections (that may or may not come with such) do make a big difference
Bottom line: if you’d like to know which of your decisions are affecting your healthy longevity (beyond the obvious diet, exercise, etc), this is a great book for collating that information and presenting, in essence, a guideline for a long healthy life.
Click here to check out The Longevity Project and see how it applies to your life!
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‘I can’t quite shut it off’: Prevalence of insomnia a growing concern for women
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Tasha Werner, 43, gets up at 3:30 a.m. twice a week for her part-time job at a fitness centre in Calgary. After a five-hour shift, she is back home by 9 a.m. to homeschool her two children, aged 9 and 12. The hardest part of her position – stay-at-home mom, homeschool teacher and part-time worker – is the downtime “lost from my life,” says Werner.
A study by Howard M. Kravitz, a psychiatrist in Chicago, showed that up to 60 per cent of women experience sleep disorders due to hormonal changes linked to menopause. But there is an increasing prevalence of insomnia symptoms in women that may be attributed, in part, to societal changes.
“We live in a world that didn’t exist a generation ago. Now everyone is trying to figure it out,” says Michael Grandner, director of the Sleep and Health Research Program at the University of Arizona.
While women are no longer expected to stay at home, many who are employed outside the home also have the primary responsibility for family matters. And women aged 40 to 60 commonly fall within the “sandwich generation,” caring for both children and parents.
As women juggle their responsibilities, these duties can take a toll, both emotionally and practically.
Both Werner and her husband were raised in traditional homes; their mothers stayed at home to oversee childcare, cooking, grocery shopping and household duties. Initially, Werner and her husband followed a similar path, mirroring their parents’ lives as homemakers. “I think we just fell into what we were used to,” says Werner.
However, a notable shift in their family dynamics occurred once she started working outside the home.
Her children’s physical needs and illnesses have had major consequences on her sleep. If one of the children is sick with the flu, that’s “a week of not a lot of sleep during the night,” she says, “because that’s my job.” Many nights, she finds herself waking up between 1 a.m. and 3 a.m., worrying about how the kids are doing academically or behaviourally.
“We face a specific set of anxieties and a different set of pressures than men,” says Emma Kobil, who has been a therapist in Denver, Colo., for 15 years and is now an insomnia coach. There is so much pressure to be everything as a woman – to be an amazing homemaker and worker while maintaining a hot-rocking body and having a cool personality, to “be the cool mom but also the CEO, to follow your dreams and be the boss b****,” says Kobil.
And there’s an appeal to that concept. Daughters grow up viewing their moms as superwomen juggling responsibilities. But what isn’t always obvious are the challenges women face while managing their lives and the health issues they may encounter.
A study revealed that women are 41 per cent more at risk of insomnia than men.
A thorough study revealed that women are 41 per cent more at risk of insomnia than men. Beyond menopausal hormonal shifts, societal pressures, maternal concerns and the challenge of balancing multiple roles contribute to women’s increased susceptibility to insomnia.
Cyndi Aarrestad, 57, lives on a farm in Saskatchewan with her husband, Denis. Now an empty nester, Aarrestad fills her time working on the farm, keeping house, volunteering at her church and managing her small woodworking business. And she struggles with sleep.
Despite implementing some remedies, including stretching, drinking calming teas and rubbing her feet before bed, Aarrestad says achieving restful sleep has remained elusive for the past decade.
Two primary factors contribute to her sleep challenges — her inability to quiet her mind and hormonal hot flashes due to menopause. Faced with family and outside commitments, Aarrestad finds it challenging to escape night time’s mental chatter. “It’s a mom thing for me … I can’t quite shut it off.” Even as her children transitioned to young adulthood and moved out, the worries persisted, highlighting the lasting concerns moms have about their kids’ jobs, relationships and overall well-being.
Therapist Kobil says that every woman she’s ever worked with experiences this pressure to do everything, to be perfect. These women feel like they’re not measuring up. They’re encouraged to take on other people’s burdens; to be the confidante and the saviour in many ways; to sacrifice themselves. Sleep disruptions simply reflect the consequences of this pressure.
“They’re trying to fit 20 hours in a 24-hour day, and it doesn’t work,” says Grandner, the sleep specialist.
Grandner says that consistently sleeping six hours or less as an adult makes one 55 per cent more likely to become obese, 20 per cent more likely to develop high blood pressure, and 30 per cent more likely to develop Type 2 diabetes if you didn’t have it already. This lack of sleep makes you more likely to catch the flu. It makes vaccines less effective, and it increases your likelihood of developing depression and anxiety.
When is the time to change? Yesterday. Grandner warns that the sleep sacrifices made at a young age impact health later. But it’s never too late to make changes, he says, and “you do the best with what you’ve got.”
Kobil suggests a practical approach for women struggling with sleep. She emphasizes understanding that sleeplessness isn’t a threat and encourages a shift in mindset about being awake. Instead of fighting sleeplessness, she advises treating oneself kindly, recognizing the difficulty.
Kobil recommends creating a simple playbook with comforting activities for awake moments during the night. Just as you would comfort a child who’s afraid, she suggests being gentle with yourself, gradually changing the perception of wakefulness into a positive experience.
This article is republished from HealthyDebate under a Creative Commons license. Read the original article.
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More Things Dopamine Does For Us
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In this week’s news roundup, we have two dopamine items and one other for variety:
The real “dopamine switch”
Dopamine is well-known as “the reward chemical”, and indeed it is that, but it also plays a central role in many neurological processes, including:
- Linear task processing
- Motivation
- Learning and memory
- Motor functions
- Language faculties
Recent research has now shown its importance in cognitive flexibility, i.e. the ability to adapt to circumstances, and switch approaches appropriately to such, and generally not get stuck in a cognitive rut:
Read in full: Scientists confirm neurobiochemical link between dopamine and cognitive flexibility
Related: The Dopamine Myth
You may like the sound of this
It’s been known for a while that dopamine is involved in learning and memory (as mentioned above), but this has been established largely by associative studies, e.g. “people with lower dopamine levels learn less easily”. But scientists have now mapped out more of how it actually does that.
One more reason to ensure we have and maintain healthy dopamine levels!
Read in full: Songbirds highlight dopamine’s role in learning
Related: 10 Ways To Naturally Boost Dopamine
Resist Or Run!
When it comes to protecting against bone loss, resistance exercise remains key, but impact-laden activities such as running (but not lower-level everyday activity) can help too. There have been studies on the extent to which walking (a load-bearing activity) may be protective against bone loss, and the results of those studies have mostly been inconclusive.
This study looked into the incidence (or not, as the case may be) of bone-loading impacts in everyday movements, using accelerometers, and measured bone mineral density before and after testing periods. Those that had higher-intensity bone-loading movements (so, resistance training or running, for example) retained the best measures of bone density through menopause into postmenopause:
Read in full: Everyday physical activity does not slow bone loss during menopause, finds study
Related: The Bare-Bones Truth About Osteoporosis
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Fast Exercise – by Dr. Michael Mosley & Peta Bee
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We’ve written before about the benefits of High-Intensity Interval Training (HIIT), but there’s more to say than we can fit in a short article!
Dr. Michael Mosley, who hates exercise but knows his stuff when it comes to the benefits, teamed up with Peta Bee, who loves exercise and is a science journalist with degrees in sports science and nutrition, to bring us this book.
In it, we learn a lot about:
- the science of HIIT
- what makes it so different from most kinds of exercise
- exactly what benefits one can expect
…in a very detailed clinical fashion (while still remaining very readable).
By “very detailed clinical fashion”, here we mean “one minute of this kind of exercise this many times per week over this period of time will give this many extra healthy life-years”, for example, along with lots of research to back numbers, and explanations of the mechanisms of action (e.g. reducing inflammatory biomarkers of aging, increasing cellular apoptosis, improving cardiometabolic stats for reduced CVD risk, and many things)
There’s also time/space given over to exactly what to do and how to do it, giving enough options to suit personal tastes/circumstances.
Bottom line: if you’d like to make your exercise work a lot harder for you while you spend a lot less time working out, then this book will help you do just that!
Click here to check out Fast Exercise, and enjoy the benefits!
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