Cordyceps: Friend Or Foe?
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Cordyceps: friend or foe?
Cordyceps is a famously frightening fungus. It’s the one responsible for “zombie ants” and other zombie creatures, and it’s the basis for the existential threat to humanity in the TV show The Last of Us.
It’s a parasitic fungus that controls the central and peripheral nervous systems of its host, slowly replacing the host’s body, as well as growing distinctive spines that erupt out of the host’s body. Taking over motor functions, it compels the host to do two main things, which are to eat more food, and climb to a position that will be good to release spores from.
Fortunately, none of that matters to humans. Cordyceps does not (unlike in the TV show) affect humans that way.
What does Cordyceps do in humans?
Cordyceps (in various strains) is enjoyed as a health supplement, based on a long history of use in Traditional Chinese Medicine, and nowadays it’s coming under a scientific spotlight too.
The main health claims for it are:
- Against inflammation
- Against aging
- Against cancer
- For blood sugar management
- For heart health
- For exercise performance
Sounds great! What does the science say?
There’s a lot more science for the first three (which are all closely related to each other, and often overlapping in mechanism and effect).
So let’s take a look:
Against inflammation
The science looks promising for this, but studies so far have either been in vitro (cell cultures in petri dishes), or else murine in vivo (mouse studies), for example:
- Anti-inflammatory effects of Cordyceps mycelium in murine macrophages
- Cordyceps sinensis as an immunomodulatory agent
- Immunomodulatory functions of extracts from Cordyceps cicadae
- Cordyceps pruinosa inhibits in vitro and in vivo inflammatory mediators
In summary: we can see that it has anti-inflammatory properties for mice and in the lab; we’d love to see the results of studies done on humans, though. Also, while it has anti-inflammatory properties, it performed less well than commonly-prescribed anti-inflammatory drugs, for example:
❝C. militaris can modulate airway inflammation in asthma, but it is less effective than prednisolone or montelukast.❞
Against aging
Because examining the anti-aging effects of a substance requires measuring lifespans and repeating the experiment, anti-aging studies do not tend to be done on humans, because they would take lifetimes to perform. To this end, it’s inconvenient, but not a criticism of Cordyceps, that studies have been either mouse studies (short lifespan, mammals like us) or fruit fly studies (very short lifespan, genetically surprisingly similar to us).
The studies have had positive results, with typical lifespan extensions of 15–20%:
- The lifespan-extending effect of Cordyceps sinensis in normal mice
- Cordyceps sinensis oral liquid prolongs the lifespan of the fruit fly, Drosophila melanogaster
- Anti-aging activity of polysaccharides from Cordyceps militaris
- Anti-aging effect of Cordyceps sinensis extract
Against cancer
Once again, the studies here have been in vitro, or murine in vivo. They do look good though:
In vitro (human cell cultures in a lab):
In vivo (mouse studies):
Summary of these is: Cordyceps quite reliably inhibits tumor growth in vitro (human cell cultures) and in vivo (mouse studies). However, trials in human cancer patients are so far conspicuous by their absence.
For blood sugar management
Cordyceps appears to mimic the action of insulin, without triggering insulin sensitivity. For example:
The anti-hyperglycemic activity of the fruiting body of Cordyceps in diabetic rats
There were some other rat/mouse studies with similar results. No studies in humans yet.
For heart health
Cordyceps contains adenosine. You may remember that caffeine owes part of its stimulant effect to blocking adenosine, the hormone that makes us feel sleepy. So in this way, Cordyceps partially does the opposite of what caffeine does, and may be useful against arrhythmia:
Cardiovascular protection of Cordyceps sinensis act partially via adenosine receptors
For exercise performance
A small (30 elderly participants) study found that Cordyceps supplementation improved VO2 max by 7% over the course of six weeks:
However, another small study (22 young athletes) failed to reproduce those results:
Cordyceps Sinensis supplementation does not improve endurance exercise performance
In summary…
Cordyceps almost certainly has anti-inflammation, anti-aging, and anti-cancer benefits.
Cordyceps may have other benefits too, but the evidence is thinner on the ground for those, so far.
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Mythbusting Moldy Food
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Most Food Should Not Be Fuzzy
In yesterday’s newsletter, we asked you for your policy when it comes to mold on food (aside from intentional mold, e.g. blue cheese etc), and the responses were interesting:
- About 49% said “throw the whole thing away no matter what it is; it is dangerous”
- About 24% said “cut the mold off and eat the rest of whatever it is”
- The remainder were divided equally between “eat it all; keep the immune system on its toes” and “cut the mold off bread, but moldy animal products are dangerous”
So what does the science say?
Some molds are safe to eat: True or False?
True! We don’t think this is contentious so we’ll not spend much time on it, but just for the sake of being methodical: foods that are supposed to have mold on, including many kinds of cheese and even some kinds of cured meat (salami is an example; that powdery coating is mold).
We could give a big list of safe and unsafe molds, but that would be a list of names and let’s face it, they don’t introduce themselves by name.
However! The litmus test of “is it safe to eat” is:
Did you acquire it with this mold already in place and exactly as expected and advertised?
- If so, it is safe to eat (unless you have an allergy or such)
- If not, it is almost certainly not safe to eat
(more on why, later)
The “sniff test” is a good way to tell if moldy food is bad: True or False?
False. Very false. Because of how the sense of smell works.
You may feel like smell is a way of knowing about something at a distance, but the only way you can smell something is if particles of it are physically connecting with your olfactory receptors inside you. Yes, that has unfortunate implications about bathroom smells, but for now, let’s keep our attention in the kitchen.
If you sniff a moldy item of food, you will now have its mold spores inside your respiratory system. You absolutely do not want them there.
If we cut off the mold, the rest is safe to eat: True or False?
True or False, depending on what it is:
- Hard vegetables (e.g carrots, cabbage), and hard cheeses (e.g. Gruyère, Gouda) – cut off with an inch margin, and it should be safe
- Soft vegetables (e.g. tomatoes, and any vegetables that were hard but are now soft after cooking) – discard entirely; it is unsafe
- Anything else – discard entirely; it is unsafe
The reason for this is because in the case of the hard products mentioned, the mycelium roots of the mold cannot penetrate far.
In the case of the soft products mentioned, the surface mold is “the tip of the iceberg”, and the mycelium roots, which you will not usually be able to see, will penetrate the rest of it.
“Anything else” seems like quite a sweeping statement, but fruits, soft cheeses, yogurt, liquids, jams and jellies, cooked grains and pasta, meats, and yes, bread, are all things where the roots can penetrate deeply and easily. Regardless of you only being able to see a small amount, the whole thing is probably moldy.
The USDA has a handy downloadable factsheet:
Molds On Food: Are They Dangerous?
Eating a little mold is good for the immune system: True or False?
False, generally. There are of course countless types of mold, but not only are many of them pathogenic (mycotoxins), but also, a food that has mold will usually also have pathogenic bacteria along with the mold.
See for example: Occurrence, Toxicity, and Analysis of Major Mycotoxins in Food
Food poisoning will never make you healthier.
But penicillin is safe to eat: True or False?
False, and also penicillin is not the mold on your bread (or other foods).
Penicillin, an antibiotic* molecule, is produced by some species of Penicillium sp., a mold. There are hundreds of known species of Penicillium sp., and most of them are toxic, usually in multiple ways. Take for example:
Penicillium roqueforti PR toxin gene cluster characterization
*it is also not healthy to consume antibiotics unless it is seriously necessary. Antibiotics will wipe out most of your gut’s “good bacteria”, leaving you vulnerable. People have died from C. diff infections for this reason. So obviously, if you really need to take antibiotics, take them as directed, but if not, don’t.
See also: Four Ways Antibiotics Can Kill You
One last thing…
It may be that someone reading this is thinking “I’ve eaten plenty of mold, and I’m fine”. Or perhaps someone you tell about this will say that.
But there are two reasons this logic is flawed:
- Survivorship bias (like people who smoke and live to 102; we just didn’t hear from the 99.9% of people who smoke and die early)
- Being unaware of illness is not being absent of illness. Anyone who’s had an alarming diagnosis of something that started a while ago will know this, of course. It’s also possible to be “low-level ill” often and get used to it as a baseline for health. It doesn’t mean it’s not harmful for you.
Stay safe!
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When “Normal” Health Is Not What You Want
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It’s Q&A Day at 10almonds!
Have a question or a request? You can always hit “reply” to any of our emails, or use the feedback widget at the bottom!
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
❝When going to sleep, I try to breathe through my nose (since everyone says that’s best). But when I wake I often find that I am breathing through my mouth. Is that normal, or should I have my nose checked out?❞
It is quite normal, but when it comes to health, “normal” does not always mean “optimal”.
- Good news: it is correctable!
- Bad news: it is correctable by what may be considered rather an extreme practice that comes with its own inconveniences and health risks.
Some people correct this by using medical tape to keep their mouth closed at night, ensuring nose-breathing. Advocates of this say that after using it for a while, nose-breathing in sleep will become automatic.
We know of no hard science to confirm this, and cannot even offer a personal anecdote on this one. Here are some pop-sci articles that do link to the (very few) studies that have been conducted:
- Mouth taping may be a trending sleep hack, but the science behind it is slim
- Mouth Taping for Sleep: Does it Work? And What are the Side Effects?
This writer’s personal approach is simply to do breathing exercises when going to sleep and first thing upon awakening, and settle for imperfection in this regard while asleep.
Meanwhile, take care!
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Sweet Dreams Are Made of THC (Or Are They?)
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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 😎
❝I’m one of those older folks that have a hard time getting 7 hrs. I know a lot of it my fault…like a few beers at nite…🥰am now trying THC gummies for anxiety, instead of alcohol……less calories 😁how does THC affect our sleep,? Safer than alcohol…..I know your next article 😊😊😊😊❣️😊alot of us older kids do take gummies 😲😲😲thank you❞
Great question! We wrote a little about CBD gummies (not THC) before:
…and went on to explore THC’s health benefits and risks here:
For starters, let’s go ahead and say: you’re right that it’s safer (for most people) than alcohol—but that’s not a strong claim, because alcohol is very bad for pretty much everything, including sleep.
So how does THC measure up when it comes to sleep quality?
Good news: it affects the architecture of sleep in such a way that you will spend longer in deep sleep (delta wave activity), which means you get more restorative and restful sleep!
See also: Alpha, beta, theta: what are brain states and brain waves? And can we control them?
Bad news: it does so at the cost of reducing your REM sleep, which is also necessary for good brain health, and will cause cognitive impairment if you skip too much. Normally, if you are sleep-deprived, the brain will prioritize REM sleep at the cost of other kinds of sleep; it’s that important. However, if you are chemically impaired from getting healthy REM sleep, there’s not much your brain can do to save you from the effects of REM sleep loss.
See: Cannabis, Cannabinoids, and Sleep: a Review of the Literature
This is, by the way, a reason that THC gets prescribed for some sleep disorders, in cases where the initial sleep disruption was because of nightmares, as it will reduce those (along with any other dreams, as collateral damage):
One thing to be careful of if using THC as a sleep aid is that withdrawal may make your symptoms worse than they were to start with:
Updates in the use of cannabis for insomnia
With all that in mind, you might consider (if you haven’t already tried it) seeing whether CBD alone improves your sleep, as while it does also extend time in deep sleep, it doesn’t reduce REM nearly as much as THC does:
👆 this study was paid for by the brand being tested, so do be aware of potential publication bias. That’s not to say the study is necessarily corrupt, and indeed it probably wasn’t, but rather, the publication of the results was dependent on the company paying for them (so hypothetically they could have pulled funding from any number of other research groups that didn’t get the results they wanted, leaving this one to be the only one published). That being said, the study is interesting, which is why we’ve linked it, and it’s a good jumping-off-point for finding a lot of related papers, which you can see listed beneath it.
CBD also has other benefits of its own, even without THC:
CBD Oil: What Does The Science Say?
Take care!
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Give Your Adrenal Glands A Chance
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The Hats Of Wrath
Your adrenal glands are two little hat-shaped glands that sit on top of your kidneys (like your kidneys are wearing them as hats, in fact).
They produce adrenaline, as you might have guessed, and also cortisol and aldosterone, which you might or might not have known, as well as some miscellaneous corticosteroids that are beyond the scope of today’s article.
Fun fact! For a long time, doctors thought adrenal glands were much larger than they usually are, because of learning anatomy from corpses that were dissected, but invariably the corpses were those of poor people, especially criminals, whose adrenal glands were almost always overworked and swollen.
You don’t want yours to be like that.
What goes wrong
Assuming you don’t have a rare disorder like Addison’s disease (in which the adrenal glands don’t produce enough of the hormones they’re supposed to), your adrenal glands will usually not have trouble producing enough adrenaline et al.
However, as we learned from the Victorian vagabonds, they can also have no problems producing too much—much like any organ that gets overworked, however, this has consequences.
Hopefully you’re not living a life of stressful crime on the streets, but maybe you have other reasons your adrenal glands are working overtime, such as any source of chronic stress, bad sleep (can’t recharge without this downtime), overuse of stimulants (including caffeine and/or nicotine), and, counterintuitively, alcohol. All these things can tax the adrenal glands considerably.
When this happens, in the extreme we can get Cushing’s syndrome, characterized by the symptoms: hypertension, cortisol-based fat distribution i.e. especially face and abdomen, weakness, fragile easily irritable skin, hair loss and/or hirsutism, paradoxically, and of course general fatigue.
In the non-extreme, we get all the same symptoms just to a lower level, and experience what the medical profession is begging us not to call “Adrenal Fatigue Syndrome” because that’s not an official diagnosis, whereas if it gets a name then they’ll be expected to treat it.
What keeps things going right
Obviously, the opposite of the above, for a start. Which means:
Manage chronic stress; see: How To Manage Chronic Stress
Get good sleep; see: Why You Probably Need More Sleep
Go easy on the caffeine; see: Caffeine Mythbusting
Skip the nicotine; see: Nicotine Benefits (That We Don’t Recommend)!
Avoid alcohol; see: How To Reduce Or Quit Alcohol
There are specific vitamins and minerals that support adrenal health too; they are: vitamins B5, B6, B12, C, & D, and also magnesium and zinc.
Good dietary sources of the above include green leafy things, cruciferous vegetables*, nuts and seeds, avocados, olive oil, and if you eat fish, then also fatty fish.
In contrast, it is good to cut down (or avoid entirely) red meat and unfermented dairy.
*Unsure how to get cruciferous vegetables in more often? Try today’s featured recipe, superfood broccoli pesto
Want to know more?
A large part of adrenal health is about keeping cortisol levels down generally (except: for most of us, we can have a little hormesis, as a treat), so for the rest of that you might like to read:
Lower Your Cortisol! (Here’s Why & How)
Take care!
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Inheritance – by Dr. Sharon Moalem
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We know genes make a big difference to a lot about us, but how much? And, the genes we have, we’re stuck with, right?
Dr. Sharon Moalem shines a bright light into some of the often-shadowier nooks and crannies of our genetics, covering such topics as:
- How much can (and can’t) be predicted from our parents’ genes—even when it comes to genetic traits that both parents have, and Gregor Mendel himself would (incorrectly) think obvious
- How even something so seemingly simple and clear as genetic sex, very definitely isn’t
- How traumatic life events can cause epigenetic changes that will scar us for generations to come
- How we can use our genetic information to look after our health much better
- How our life choices can work with, or overcome, the hand we got dealt in terms of genes
The style of the book is conversational, down to how there’s a lot of “I” and “you” in here, and the casual style belies the heavy, sharp, up-to-date science contained within.
Bottom line: if you’d like insight into the weird and wonderful nuances of genetics as found in this real, messy, perfectly chaotic world, this book is an excellent choice.
Click here to check out Inheritance, and learn more about yours!
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Over 50? Do These 3 Stretches Every Morning To Avoid Pain
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Will Harlow, over-50s specialist physiotherapist, recommends these three stretches be done daily for cumulative benefits over time, especially if you have arthritis, stiff joints, or similar morning pain:
The good-morning routine
These stretches are designed for people with arthritis and stiff joints, but if you experience any extra pain, or are aware of having some musculoskeletal irregularity, do seek professional advice (such as from a local physiotherapist). Otherwise, the three stretches he recommends are:
Quad hip flexor stretch
This one is performed while lying on your side in bed:
- Bring the top leg up toward your body, grab the shin, and pull the leg backward to stretch.
- Feel the stretch in the front of the leg (quadriceps and hip flexor).
- Hold for 30 seconds and repeat on both sides.
- Use a towel or band if you can’t reach your shin.
Book-opener
This one helps improve mobility in the lower and mid-back:
- Lie on your side with arms at a 90-degree angle in front of your body.
- Roll backward, opening the top arm while keeping legs in place.
- Hold for 20–30 seconds or repeat the movement several times.
- Optionally, allow your head to rotate for a neck stretch.
Calf stretch with chest-opener
This one combines a calf and chest stretch:
- Stand in a lunged position, keeping the back leg straight and heel down for the calf stretch.
- Place hands behind your head, open elbows, and lift your head slightly for a chest stretch.
- Hold for 20–30 seconds, then switch legs.
For more on all the above plus visual demonstrations, enjoy:
Click Here If The Embedded Video Doesn’t Load Automatically!
Want to learn more?
You might also like:
Take care!
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