Bird flu has been detected in a pig in the US. Why does that matter?
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The United States Department of Agriculture last week reported that a pig on a backyard farm in Oregon was infected with bird flu.
As the bird flu situation has evolved, we’ve heard about the A/H5N1 strain of the virus infecting a range of animals, including a variety of birds, wild animals and dairy cattle.
Fortunately, we haven’t seen any sustained spread between humans at this stage. But the detection of the virus in a pig marks a worrying development in the trajectory of this virus.
How did we get here?
The most concerning type of bird flu currently circulating is clade 2.3.4.4b of A/H5N1, a strain of influenza A.
Since 2020, A/H5N1 2.3.4.4b has spread to a vast range of birds, wild animals and farm animals that have never been infected with bird flu before.
While Europe is a hotspot for A/H5N1, attention is currently focused on the US. Dairy cattle were infected for the first time in 2024, with more than 400 herds affected across at least 14 US states.
Bird flu has enormous impacts on farming and commercial food production, because infected poultry flocks have to be culled, and infected cows can result in contaminated diary products. That said, pasteurisation should make milk safe to drink.
While farmers have suffered major losses due to H5N1 bird flu, it also has the potential to mutate to cause a human pandemic.
Birds and humans have different types of receptors in their respiratory tract that flu viruses attach to, like a lock (receptors) and key (virus). The attachment of the virus allows it to invade a cell and the body and cause illness. Avian flu viruses are adapted to birds, and spread easily among birds, but not in humans.
So far, human cases have mainly occurred in people who have been in close contact with infected farm animals or birds. In the US, most have been farm workers.
The concern is that the virus will mutate and adapt to humans. One of the key steps for this to happen would be a shift in the virus’ affinity from the bird receptors to those found in the human respiratory tract. In other words, if the virus’ “key” mutated to better fit with the human “lock”.
A recent study of a sample of A/H5N1 2.3.4.4b from an infected human had worrying findings, identifying mutations in the virus with the potential to increase transmission between human hosts.
Why are pigs a problem?
A human pandemic strain of influenza can arise in several ways. One involves close contact between humans and animals infected with their own specific flu viruses, creating opportunities for genetic mixing between avian and human viruses.
Pigs are the ideal genetic mixing vessel to generate a human pandemic influenza strain, because they have receptors in their respiratory tracts which both avian and human flu viruses can bind to.
This means pigs can be infected with a bird flu virus and a human flu virus at the same time. These viruses can exchange genetic material to mutate and become easily transmissible in humans.
Interestingly, in the past pigs were less susceptible to A/H5N1 viruses. However, the virus has recently mutated to infect pigs more readily.
In the recent case in Oregon, A/H5N1 was detected in a pig on a non-commercial farm after an outbreak occurred among the poultry housed on the same farm. This strain of A/H5N1 was from wild birds, not the one that is widespread in US dairy cows.
The infection of a pig is a warning. If the virus enters commercial piggeries, it would create a far greater level of risk of a pandemic, especially as the US goes into winter, when human seasonal flu starts to rise.
How can we mitigate the risk?
Surveillance is key to early detection of a possible pandemic. This includes comprehensive testing and reporting of infections in birds and animals, alongside financial compensation and support measures for farmers to encourage timely reporting.
Strengthening global influenza surveillance is crucial, as unusual spikes in pneumonia and severe respiratory illnesses could signal a human pandemic. Our EPIWATCH system looks for early warnings of such activity, which can speed up vaccine development.
If a cluster of human cases occurs, and influenza A is detected, further testing (called subtyping) is essential to ascertain whether it’s a seasonal strain, an avian strain from a spillover event, or a novel pandemic strain.
Early identification can prevent a pandemic. Any delay in identifying an emerging pandemic strain enables the virus to spread widely across international borders.
Australia’s first human case of A/H5N1 occurred in a child who acquired the infection while travelling in India, and was hospitalised with illness in March 2024. At the time, testing revealed Influenza A (which could be seasonal flu or avian flu), but subtyping to identify A/H5N1 was delayed.
This kind of delay can be costly if a human-transmissible A/H5N1 arises and is assumed to be seasonal flu because the test is positive for influenza A. Only about 5% of tests positive for influenza A are subtyped further in Australia and most countries.
In light of the current situation, there should be a low threshold for subtyping influenza A strains in humans. Rapid tests which can distinguish between seasonal and H5 influenza A are emerging, and should form part of governments’ pandemic preparedness.
A higher risk than ever before
The US Centers for Disease Control and Prevention states that the current risk posed by H5N1 to the general public remains low.
But with H5N1 now able to infect pigs, and showing worrying mutations for human adaptation, the level of risk has increased. Given the virus is so widespread in animals and birds, the statistical probability of a pandemic arising is higher than ever before.
The good news is, we are better prepared for an influenza pandemic than other pandemics, because vaccines can be made in the same way as seasonal flu vaccines. As soon as the genome of a pandemic influenza virus is known, the vaccines can be updated to match it.
Partially matched vaccines are already available, and some countries such as Finland are vaccinating high-risk farm workers.
C Raina MacIntyre, Professor of Global Biosecurity, NHMRC L3 Research Fellow, Head, Biosecurity Program, Kirby Institute, UNSW Sydney and Haley Stone, Research Associate, Biosecurity Program, Kirby Institute & CRUISE lab, Computer Science and Engineering, UNSW Sydney
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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How worried should I be about cryptosporidiosis? Am I safe at the pool?
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You might have heard of something called “cryptosporidiosis” recently, closely followed by warnings to stay away from your local swimming pool if you’ve had diarrhoea.
More than 700 cases of this gastrointestinal disease were reported in Queensland in January, which is 13 times more than in January last year. Just under 500 cases have been recorded in New South Wales this year to-date, while other states have similarly reported an increase in the number of cryptosporidiosis infections in recent months.
Cryptosporidiosis has been listed as a national notifiable disease in Australia since 2001.
But what exactly is it, and should we be worried?What causes cryptosporidiosis, and who is affected?
Cryptosporidiosis is the disease caused by the parasite Cryptosporidium, of which there are two types that can make us sick. Cryptosporidum hominis only affects humans and is the major cause of recent outbreaks in Australia, while Cryptosporidium parvum can also affect animals.
The infection is spread by spores called oocysts in the stools of humans and animals. When ingested, these oocysts migrate and mature in the small bowel. They damage the small bowel lining and can lead to diarrhoea, nausea, vomiting, fever and abdominal discomfort.
Most people develop symptoms anywhere from one to 12 days after becoming infected. Usually these symptoms resolve within two weeks, but the illness may last longer and can be severe in those with a weakened immune system.
Children and the elderly tend to be the most commonly affected. Cryptosporidiosis is more prevalent in young children, particularly those under five, but the disease can affect people of any age.
A number of public pools have been closed lately due to cryptosporidiosis outbreaks.
LBeddoe/ShutterstockSo how do we catch it?
Most major outbreaks of cryptosporidiosis have been due to people drinking contaminated water. The largest recorded outbreak occurred in Milwaukee in 1993 where 403,000 people were believed to have been infected.
Cryptosporidium oocysts are very small in size and in Milwaukee they passed through the filtration system of one of the water treatment plants undetected, infecting the city’s water supply. As few as ten oocysts can cause infection, making it possible for contaminated drinking water to affect a very large number of people.
Four days after infection a person with cryptosporidiosis can shed up to ten billion oocysts into their stool a day, with the shedding persisting for about two weeks. This is why one infected person in a swimming pool can infect the entire pool in a single visit.
Cryptosporidium oocysts excreted in the faeces of infected humans and animals can also reach natural bodies of water such as beaches, rivers and lakes directly through sewer pipes or indirectly such as in manure transported with surface runoff after heavy rain.
One study which modelled Cryptosporidium concentrations in rivers around the world estimated there are anywhere from 100 to one million oocysts in a litre of river water.
In Australia, cryptosporidiosis outbreaks tend to occur during the late spring and early summer periods when there’s an increase in recreational water activities such as swimming in natural water holes, water catchments and public pools. We don’t know exactly why cases have seen such a surge this summer compared to other years, but we know Cryptosporidium is very infectious.
Oocysts have been found in foods such as fresh vegetables and seafood but these are not common sources of infection in Australia.
What about chlorine?
Contrary to popular belief, chlorine doesn’t kill off all infectious microbes in a swimming pool. Cryptosporidium oocysts are hardy, thick-walled and resistant to chlorine and acid. They are not destroyed by chlorine at the normal concentrations found in swimming pools.
We also know oocysts can be significantly protected from the effects of chlorine in swimming pools by faecal material, so the presence of even small amounts of faecal matter contaminated with Cryptosporidium in a swimming pool would necessitate closure and a thorough decontamination.
Young children and in particular children in nappies are known to increase the potential for disease transmission in recreational water. Proper nappy changing, frequent bathroom breaks and showering before swimming to remove faecal residue are helpful ways to reduce the risk.
Cryptosporidium can spread in other bodies of water, not just swimming pools.
Yulia Simonova/ShutterstockSome sensible precautions
Other measures you can take to reduce yours and others’ risk of cryptosporidiosis include:
- avoid swimming in natural waters such as rivers and creeks during and for at least three days after heavy rain
- avoid swimming in beaches for at least one day after heavy rain
- avoid drinking untreated water such as water from rivers or springs. If you need to drink untreated water, boiling it first will kill the Cryptosporidium
- avoid swallowing water when swimming if you can
- if you’ve had diarrhoea, avoid swimming for at least two weeks after it has resolved
- avoid sharing towels or linen for at least two weeks after diarrhoea has resolved
- avoid sharing, touching or preparing food that other people may eat for at least 48 hours after diarrhoea has resolved
- wash your hands with soap and water after going to the bathroom or before preparing food (Cryptosporidium is not killed by alcohol gels and sanitisers).
Not all cases of diarrhoea are due to cryptosporidiosis. There are many other causes of infectious gastroenteritis and because the vast majority of the time recovery is uneventful you don’t need to see a doctor unless very unwell. If you do suspect you may have cryptosporidiosis you can ask your doctor to refer you for a stool test.
Vincent Ho, Associate Professor and clinical academic gastroenterologist, Western Sydney University
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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Level-Up Your Fiber Intake! (Without Difficulty Or Discomfort)
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Why You’re Probably Not Getting Enough Fiber (And How To Fix It)
First things first… How much fiber should we be eating?
- The World Health Organization recommends we each get at least 25g of fiber per day:
- A more recent meta-review of studies, involving thousands of people and decades of time, suggests 25–29g is ideal:
- The British Nutritional Foundation gives 30g as the figure:
- The US National Academy of Sciences’ Institute of Medicine recommends 21g–38g per day, depending on age and sex:
- A large study last year gave 30–40g as the figure:
*This one is also a great read to understand more about the “why” of fiber
Meanwhile, the average American gets 16g of fiber per day.
So, how to get more fiber, without piling on too many carbs?
Foods that contain fiber generally contain carbs (there’s a limit to how much celery most people want to eat), so there are two key ideas here:
- Getting a good carb:fiber ratio
- Making substitutions that boost fiber without overdoing (or in some case, even changing) carbs
Meat → Lentils
Well-seasoned lentils can be used to replaced ground beef or similar. A cup of boiled lentils contains 18g of fiber, so you’re already outdoing the average American’s daily total.
Meat → Beans
Black beans are a top-tier option here (15g per cup, cooked weight), but many kinds of beans are great.
Chicken/Fish → Chickpeas
Yes, chicken/fish is already meat, but we’re making a case for chickpeas here. Cooked and seasoned appropriately, they do the job, and pack in 12g of fiber per cup. Also… Hummus!
Bonus: Hummus, eaten with celery sticks.
White pasta/bread → Wholewheat pasta/bread
This is one where “moderation is key”, but if you’re going to eat pasta/bread, then wholewheat is the way to go. Fiber amounts vary, so read labels, but it will always have far more than white.
Processed salty snacks → Almonds and other nuts
Nuts in general are great, but almonds are top-tier for fiber, amongst other things. A 40g handful of almonds contains about 10g of fiber.
Starchy vegetables → Non-starchy vegetables
Potatoes, parsnips, and their friends have their place. But they cannot compete with broccoli, peas, cabbage, and other non-starchy vegetables for fiber content.
Bonus: if you’re going to have starchy vegetables though, leave the skins on!
Fruit juice → Fruit
Fruit juice has had most, if not all, of its fiber removed. Eat an actual juicy fruit, instead. Apples and bananas are great options; berries such as blackberries and raspberries are even better (at around 8g per cup, compared to the 5g or so depending on the size of an apple/banana)
Processed cereals → Oats
5g fiber per cup. Enough said.
Summary
Far from being a Herculean task, getting >30g of fiber per day can be easily accomplished by a lentil ragù with wholewheat pasta.
If your breakfast is overnight oats with fruit and some chopped almonds, you can make it to >20g already by the time you’ve finished your first meal of the day.
Enjoy!
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Dentists Debunk 15 Teeth Myths
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Dentists Dr. John Yoo and Dr. Jason Lin leave no gaps in the truth:
The tooth, the whole tooth, and nothing but the tooth
Not only is there no tooth fairy (we are shocked), but also…
- “Baby teeth aren’t important.”
False! Baby teeth act as space holders for permanent teeth, affect speech development, and influence a child’s psychological well-being. - “Acidic fruits will whiten your smile.”
False! In any practical sense, anyway: acidic fruits may temporarily make teeth appear whiter by dispersing stains but cause enamel erosion and weaken teeth over time. - “Fillings last forever.”
False! Fillings can wear down, fail, or develop cavities underneath if oral hygiene isn’t maintained, requiring replacement over time. - “Cavities are irreversible.”
False! Cavities in the enamel can be reversed with fluoride and good oral hygiene, but cavities that reach the dentin are typically irreversible. - “Braces are just for crooked teeth.”
False! Braces also correct functional issues like overbites, underbites, crossbites, and prevent future complications like tooth impaction. - “A knocked-out tooth is gone for good.”
False! A knocked-out tooth can be reimplanted if done quickly (ideally within an hour); storing it in whole milk or saliva helps preserve it. - “Diet sodas won’t give you cavities.”
False! Diet sodas can still cause cavities due to their acidic pH, which erodes enamel, even without sugar. - “Dental cleanings aren’t necessary.”
False! Dental cleanings help remove plaque and tartar that regular brushing can’t, and allow for regular oral health checkups. - “Retainers aren’t for life.”
False! To maintain teeth alignment after braces, retainers should be worn long-term as teeth can shift even years later. - “You should floss before brushing.”
False! The order doesn’t matter, but do floss regularly. - “Everyone has wisdom teeth.”
False! Not everyone is born with wisdom teeth; they are the most commonly missing teeth, and not everyone needs them removed. - “Hydrogen peroxide and baking soda are good toothpaste replacements.”
False! While they are common components in toothpaste, they lack fluoride, which is essential for remineralizing and protecting enamel. - “You’re too old to get braces.”
False! There’s no age limit for braces or aligners; adults often seek them for both aesthetic and functional reasons. - “Teeth that have had root canals can’t feel.”
False! Teeth with root canals can’t feel pain from nerves, but you can still sense pressure due to surrounding ligaments. - “You’ll inevitably lose all your teeth when you’re old.”
False! Good oral hygiene and regular dental care can preserve natural teeth into old age, though genetics also play a role.
For more on each of these, enjoy:
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Want to learn more?
You might also like to read:
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- “Baby teeth aren’t important.”
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Get Better Sleep: Beyond The Basics
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First though, for the sake of being methodical, let’s quickly note the basics:
- Aim for 7–9 hours per night
- Set a regular bedtime and (equally important!) regular getting-up time
- Have a 2-hour wind-down period before bed, to decompress from any stresses of the day
- Minimal device/screen usage before bed
- Abstain from stimulants for as long before bed as reasonably possible (caffeine elimination halflife is 4–8 hours depending on your genes, call it 6 hours average to eliminate half (not the whole lot), and you’ll see it’s probably best to put a cap on it earlier rather than later).
- Abstain from alcohol, ideally entirely, but allow at least 1hr/unit before bed. So for example, 1hr for a 1oz single shot of spirits, or 2–3 hours for a glass of wine (depending on size), or 3–4 hours for a martini (depending on recipe). Not that that is not the elimination time, nor even the elimination halflife of alcohol, it’s just a “give your body a chance at least” calculation. If you like to have a drink to relax before bed, then well, only you can decide what you like more: that or actually getting restorative sleep.
- Consider a warm bath/shower before bed, if that suits your schedule.
- Wash and change your bedsheets more often than seems necessary. Or if that’s too onerous, at least change the pillowcases more often, which makes quite a difference already.
- Lower the temperature of your bedroom shortly before bedtime; this will help cue the body to produce melatonin
- Make your bedroom as dark as reasonably possible. Invest in blackout blinds/curtains, and remove any pesky electronics, or at least cover their little LEDs if it’s something that reasonably needs to remain on.
Ok, now, onwards…
Those 7–9 hours? Yes, it goes for you too.
A lot of people mistake getting 6 hours sleep per night for only needing 6 hours sleep per night. Sure, you may still be alive after regularly getting 6 hours, but (unless you have a rare mutation of the ADRB1 gene) it will be causing harm, and yes, that includes later in life; we don’t stop needing so much sleep, even stop getting it:
Why You Probably Need More Sleep
With this in mind, it becomes important to…
Prioritize your sleep—which means planning for it!
When does your bedtime routine start? According to sleep scientist Dr. Lisa Matricciani, it starts before breakfast. This is because the things we do earlier in the day can greatly affect the amount (and quality) of sleep we get later. For example, a morning moderate-to-intense exercise session greatly improves sleep at night:
Planning Ahead For Better Sleep
As for quality, that is as important as quantity, and it’s not just about “soundness” of sleep:
The 6 Dimensions Of Sleep (And Why They Matter)
“What gets measured, gets done” goes for sleep too
Sleep-deprived people usually underestimate how sleep-deprived they are. This is for the same reason as why drunk people usually underestimate how drunk they are—to put it in words that go for both situations: a cognitively impaired person lacks the cognitive function to realize how cognitively impaired they are.
Here’s the science on that, by the way:
How Sleep-Deprived Are You, Really?
For that reason, we recommend using sleep-tracking software (there are many apps for that) on your phone or, ideally, a wearable device (such as a smartwatch or similar).
A benefit of doing so is that we don’t think “well, I slept from 10pm to 6am, so that’s 8 hours”, if our device tells us we slept between 10:43pm and 5:56 am with 74% sleep efficiency because we woke up many times.
As an aside, sleep efficiency should be about 85%, by the way. Why not 100%, you ask? It’s because if your body is truly out like a light for the entire night, something is wrong (either you were very sleep-deprived, or you have been drugged, that kind of thing). See also:
An unbroken night’s sleep is a myth. Here’s what good sleep looks like.
So waking up during the night is normal, and nothing to worry about per se. If you do find trouble getting back to sleep, though:
How to Fall Back Asleep After Waking Up in the Middle of the Night
Be careful about how you try to supplement sleep
This goes both for taking substances of various kinds, and napping. Some sleep aids can help, but many are harmful and/or do not really work as such; here’s a rundown of examples of those:
Safe Effective Sleep Aids For Seniors?
And when it comes to napping, timing is everything:
How To Nap Like A Pro (No More “Sleep Hangovers”!)
Want to know a lot more?
This is the book on sleep:
Why We Sleep – by Dr. Matthew Walker
Enjoy!
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What is HRT? HRT and Hormones Explained
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In this short video, Dr. Sophie Newton explains how menopausal HRT, sometimes called just MHT, is the use of exogenous (didn’t come from your body) to replace/supplement the endogenous hormones (made in your body) that aren’t being made in the quantities that would result in ideal health.
Bioidentical hormones are, as the name suggests, chemically identical to those made in the body; there is no difference, all the way down to the atomic structure.
People are understandably wary of “putting chemicals into the body”, but in fact, everything is a chemical and those chemicals are also found in your body, just not in the numbers that we might always like.
In the case of hormones, these chemical messengers are simply there to tell cells what to do, so having the correct amount of hormones ensures that all the cells that need to get a certain message, get it.
In the case of estrogen specifically, while it’s considered a sex hormone (and it is), it’s responsible for a lot more than just the reproductive system, which is why many people without correct estrogen levels (such as peri- or post-menopause, though incorrect levels can happen earlier in life for other reasons too) can severely feel their absence in a whole stack of ways.
What ways? More than we can list here, but some are discussed in the video:
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Want to know more?
You might like our previous main features:
- What Does “Balance Your Hormones” Even Mean?
- What You Should Have Been Told About The Menopause Beforehand
- Menopausal HRT: Bioidentical vs Animal
Take care!
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Intermittent Fasting In Women
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It’s Q&A Day at 10almonds!
Have a question or a request? We love to hear from you!
In cases where we’ve already covered something, we might link to what we wrote before, but will always be happy to revisit any of our topics again in the future too—there’s always more to say!
As ever: if the question/request can be answered briefly, we’ll do it here in our Q&A Thursday edition. If not, we’ll make a main feature of it shortly afterwards!
So, no question/request too big or small
❝Does intermittent fasting differ for women, and if so, how?❞
For the sake of layout, we’ve put a shortened version of this question here, but the actual wording was as below, and merits sharing in full for context
Went down a rabbit hole on your site and now can’t remember how I got to the “Fasting Without Crashing” article on intermittent fasting so responding to this email lol, but was curious what you find/know about fasting for women specifically? It’s tough for me to sift through and find legitimate studies done on the results of fasting in women, knowing that our bodies are significantly different from men. This came up when discussing with my sister about how I’ve been enjoying fasting 1-2 days/week. She said she wanted more reliable sources of info that that’s good, since she’s read more about how temporary starvation can lead to long-term weight gain due to our bodies feeling the need to store fat. I’ve also read about that, but also that fasting enables more focused autophagy in our bodies, which helps with long-term staving off of diseases/ailments. Curious to know what you all think!
~ 10almonds subscriber
So, first of all, great question! Thanks for asking it
Next up, isn’t it strange? Books come in the format:
- [title]
- [title, for women]
You would not think women are a little over half of the world’s population!
Anyway, there has been some research done on the difference of intermittent fasting in women, but not much.
For example, here’s a study that looked at 1–2 days/week IF, in other words, exactly what you’ve been doing. And, they did have an equal number of men and women in the study… And then didn’t write down whether this made a difference or not! They recorded a lot of data, but neglected to note down who got what per sex:
Here’s a more helpful study, that looked at just women, and concluded:
❝In conclusion, intermittent fasting could be a nutritional strategy to decrease fat mass and increase jumping performance.
However, longer duration programs would be necessary to determine whether other parameters of muscle performance could be positively affected by IF. ❞
~ Dr. Martínez-Rodríguez et al.
Those were “active women”; another study looked at just women who were overweight or obese (we realize that “active women” and “obese or overweight women” is a Venn diagram with some overlap, but still, the different focus is interesting), and concluded:
❝IER is as effective as CER with regard to weight loss, insulin sensitivity and other health biomarkers, and may be offered as an alternative equivalent to CER for weight loss and reducing disease risk.❞
As for your sister’s specific concern about yo-yoing, we couldn’t find studies for this yet, but anecdotally and based on books on Intermittent Fasting, this is not usually an issue people find with IF. This is assumed to be for exactly the reason you mention, the increased cellular apoptosis and autophagy—increasing cellular turnover is very much the opposite of storing fat!
You might, by the way, like Dr. Mindy Pelz’s “Fast Like A Girl”, which we reviewed previously
Take care!
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