We Are Such Stuff As Fish Are Made Of
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Research Review: Collagen
For something that’s a very popular supplement, not many people understand what collagen is, where it comes from, or what it does.
In a nutshell:
Collagen is a kind of protein. Our bodies make it naturally, and we can also get more in our diet and/or take extra as a supplement.
Our bodies use collagen in connective tissue, skin, tendon, bone, and cartilage. It has many functions, but a broad description would be “holding things together”.
As we get older, our bodies produce less collagen. Signs of this include wrinkles, loss of skin hydration, and joint pain.
Quick test: pinch the skin on the middle of the back of one of your hands, and then watch what happens when you get low. How quickly and easily did your skin returns to its original shape?
If it was pretty much instantanous and flawless, congratulations, you have plenty of collagen (and also elastin). If you didn’t, you are probably low on both!
(they are quite similar proteins and are made from the same base “stuff”, so if you’re low on one, you’ll usually be low on both)
Quick note: A lot of research out there has been funded by beauty companies, so we had our work cut out for us today, and have highlighted where any research may be biased.
More than skin deep
While marketing for collagen is almost exclusively aimed at “reduce wrinkles and other signs of aging”, it does a lot more than that.
You remember we mentioned that many things from the bones outward are held together by collagen? We weren’t kidding…
Read: Osteoporosis, like skin ageing, is caused by collagen loss which is reversible
Taking extra collagen isn’t the only way
We can’t (yet!) completely halt the age-related loss of collagen, but we can slow it, with our lifestyle choices:
- Don’t smoke tobacco
- Drink only in moderation (or not at all)
- Avoid foods with added sugar, and high-processed foods in general
- Wear sunscreen when appropriate
Can I get collagen from food?
Yep! Just as collagen holds our bodies together, it holds the bodies of other animals together. And, just like collagen is found in most parts of our body but most plentifully in our skin and bones, that’s what to eat to get collagen from other animals, e.g:
- Chicken skin
- Fish skin
- Bone broth ← health benefits and recipes at this link!
What about vegans?
Yes, vegans are also held together by collagen! We do not, however, recommend eating their skin or boiling their bones into broth. Ethical considerations aside, cannibalism can give you CJD!
More seriously, if you’re vegan, you can’t get collagen from a plant-based diet, but you can get the stuff your body uses to make collagen. Basically, you want to make sure you get plenty of:
- Protein (beans, pulses, nuts, etc are all fine; it’s hard to go wrong with this)
- Vitamin C
- Vitamin D
- and Zinc
Just be sure to continue to remember to avoid highly-processed foods. So:
- Soy mince/chunks whose ingredients list reads: “soya”? Yes!
- The Incredible Burger or Linda McCartney’s Sausages? Sadly less healthy
Read: Advanced Glycation End Products in Foods and a Practical Guide to Their Reduction in the Diet
Meat-eaters might want to read that one too. By far the worst offenders for AGEs (Advanced Glycation End Products, which can not only cause collagen to stiffen, but also inactivate proteins responsible for collagen repair, along with doing much more serious damage to your body’s natural functions) include:
- Hot dogs
- Bacon
- Fried/roasted/grilled meats
Is it worth it as a supplement?
That depends on you, your age, and your lifestyle, but it’s generally considered safe*
*if you have a seafood allergy, be careful though, as many supplements are from fish or shellfish—you will need to find one that’s free from your allergen
Also, all collagen is animal-derived. So if you’re a vegan, decide for yourself whether this constitutes medicine and if so, whether that makes it ethically permissible to you.
With that out of the way:
What the science says on collagen supplementation
Collagen for skin
Read: Effects of collagen supplementation on skin aging (systematic review and meta-analysis)
The short version is that they selected 19 studies with over a thousand participants in total, and they found:
In the meta-analysis, a grouped analysis of studies showed favorable results of hydrolyzed collagen supplementation compared with placebo in terms of skin hydration, elasticity, and wrinkles.
The findings of improved hydration and elasticity were also confirmed in the subgroup meta-analysis.
Based on results, ingestion of hydrolyzed collagen for 90 days is effective in reducing skin aging, as it reduces wrinkles and improves skin elasticity and hydration.
Caveat: while that systematic review had no conflicts of interests, at least some of the 19 studies will have been funded by beauty companies. Here are two, so that you know what that looks like:
Funded by Quiris to investigate their own supplement, Elasten®:
A Collagen Supplement Improves Skin Hydration, Elasticity, Roughness, and Density
Funded by BioCell to investigate their own supplement, BioCell Collagen:
The Effects of Skin Aging Associated with the Use of BioCell Collagen
A note on funding bias: to be clear, the issue is not that the researchers might be corrupt (though that could happen).
The issue is more that sometimes companies will hire ten labs to do ten research studies… and then pull funding from ones whose results aren’t going the way they’d like.
So the “best” (for them) study is the one that gets published.
Here’s another systematic review—like the one at the top of this section—that found the same, with doses ranging from 2.5g–15g per day for 8 weeks or longer:
Read: Oral Collagen Supplementation: A Systematic Review of Dermatological Applications
Again, some of those studies will have been funded by beauty companies. The general weight of evidence does seem clear and favorable, though.
Collagen for bones
Here, we encountered a lot less in the way of potential bias, because this is simply marketed a lot less. Despite being arguably far more important!
We found a high quality multi-vector randomized controlled study with a sample size of 131 postmenopausal women. They had these women take 5g collagen supplement (or placebo), and studied the results over the course of a year.
They found:
- The intake of the supplement increased bone mineral density (BMD)
- Supplementation was also associated with a favorable shift in bone markers, indicating:
- increased bone formation
- reduced bone degradation
Read: Specific Collagen Peptides Improve Bone Mineral Density and Bone Markers in Postmenopausal Wome
A follow-up study with 31 of these women found that taking 5 grams of collagen daily for a total of 4 years was associated with a progressive increase in BMD.
You might be wondering if collagen also helps against osteoarthritis.
The answer is: yes, it does (at least, it significantly reduces the symptoms)
Read: Effect of collagen supplementation on osteoarthritis symptoms
In summary:
- You need collagen for health skin, bones, joints, and more
- Your body makes collagen from your food
- You can help it by getting plenty of protein, vitamins, and minerals
- You can also help it by not doing the usual Bad Things™ (smoking, drinking, eating processed foods, especially processed meats)
- You can also eat collagen directly in the form of other animals’ skin and bones
- You can also buy collagen supplements (but watch out for allergens)
Want to try collagen supplementation?
We don’t sell it (or anything else), but for your convenience…
Check it out: Hydrolyzed Collagen Peptides (the same as in most of the above studies), 90 days supply at 5g/day
We selected this one because it’s the same kind used in many of the studies, and it doesn’t contain any known allergens.
It’s bovine collagen, meaning it’s from cows, so it’s not vegan, and also some subscribers may want to abstain for religious reasons. We respect that, and/but make our recommendations based solely on the science of health and productivity.
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Pistachios vs Brazil Nuts – Which is Healthier?
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Our Verdict
When comparing pistachios to Brazil nuts, we picked the pistachios.
Why?
In terms of macros, pistachios have more protein, carbs, and fiber, while Brazil nuts have more fat. The fats are mostly healthy, although it is worth noting that Brazil nuts have not only more total saturated fat, but also more saturated fat proportionally to total fats. All in all, Brazil nuts’ macro balance isn’t bad, but we say pistachios have it better.
When it comes to vitamins, pistachios have a lot more of vitamins A, B1, B2, B3, B5, B6, B7, B9, and C, while Brazil nuts have more vitamin E. An easy win for pistachios here.
In the category of minerals, it gets interesting: pistachios have more iron and potassium, while Brazil nuts have more calcium, copper, magnesium, phosphorus, selenium, and zinc. Sounds great, but… About that selenium:
- A cup of cashews contains 38% of the RDA of selenium. This will go towards helping your hair be luscious and shiny (also important for energy conversion).
- A cup of Brazil nuts contains 10,456% of the RDA of selenium. This is way past the point of selenium toxicity, and your (luscious, shiny) hair will fall out.
For this reason, it’s recommended to eat no more than 3–4 Brazil nuts per day.
We consider that a point against Brazil nuts.
Adding up the sections gives us an overall win for pistachios. Of course, enjoy Brazil nuts too if you will, but in careful moderation please!
Want to learn more?
You might like to read:
Why You Should Diversify Your Nuts
Take care!
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Serotonin vs Dopamine (Know The Differences)
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Of the various neurotransmitters that people confuse with each other, serotonin and dopamine are the two highest on the list (with oxytocin coming third as people often attribute its effects to serotonin). But, for all they are both “happiness molecules”, serotonin and dopamine are quite different, and are even opposites in some ways:
More than just happiness
Let’s break it down:
Similarities:
- Both are neurotransmitters, neuromodulators, and monoamines.
- Both impact cognition, mood, energy, behavior, memory, and learning.
- Both influence social behavior, though in different ways.
Differences (settle in; there are many):
- Chemical structure:
- Dopamine: catecholamine (derived from phenylalanine and tyrosine)
- Serotonin: indoleamine (derived from tryptophan)
- Derivatives:
- Dopamine → noradrenaline and adrenaline (stress and alertness)
- Serotonin → melatonin (sleep and circadian rhythm)
- Effects on mental state:
- Dopamine: drives action, motivation, and impulsivity.
- Serotonin: promotes calmness, behavioral inhibition, and cooperation.
- Role in memory and learning:
- Dopamine: key in attention and working memory
- Serotonin: crucial for hippocampus activation and long-term memory
Symptoms of imbalance:
- Low dopamine:
- Loss of motivation, focus, emotion, and activity
- Linked to Parkinson’s disease and ADHD
- Low serotonin:
- Sadness, irritability, poor sleep, and digestive issues
- Linked to PTSD, anxiety, and OCD
- High dopamine:
- Excessive drive, impulsivity, addictions, psychosis
- High serotonin:
- Nervousness, nausea, and in extreme cases, serotonin syndrome (which can be fatal)
Brain networks:
- Dopamine: four pathways controlling movement, attention, executive function, and hormones.
- Serotonin: widely distributed across the cortex, partially overlapping with dopamine systems.
Speed of production:
- Dopamine: can spike and deplete quickly; fatigues faster with overuse.
- Serotonin: more stable, releasing steadily over longer periods.
Illustrative examples:
- Coffee boosts dopamine but loses its effect with repeated use.
- Sunlight helps maintain serotonin levels over time.
If you remember nothing else, remember this:
- Dopamine: action, motivation, and alertness.
- Serotonin: contentment, happiness, and calmness.
For more on all of the above, enjoy:
Click Here If The Embedded Video Doesn’t Load Automatically!
Want to learn more?
You might also like to read:
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Muir Glen Organic vs First Field Original – Which is Healthier?
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Our Verdict
When comparing Muir Glen Organic Ketchup to First Field Original Ketchup, we picked the First Field.
Why?
This one was a little unfair to you, as you can’t turn them around to read the ingredients here. But the point we want to share the most today is: you have to turn them around and read the ingredients! You absolutely cannot rely on appearances!
While the Muir Glen Organic may have a very “greenwashed” aesthetic going on and the word “organic” is more eye-catching than any other word on the label, it contains 4x as much sugar and 4x as much sodium.
Side-by-side, they have, per tablespoon:
First Field Original: 1g sugar, 60mg sodium
Muir Glen Organic: 4g sugar, 240mg sodiumBut what about the importance of being organic?
Well, we have one more surprise for you: the First Field ketchup is organic too, non-GMO, and contains no added concentrates either.
This isn’t an ad for First Field (by all means enjoy their products or don’t; we’re not invested), but it is a heartfelt plea to always check the backs of products and read the labels, because fronts of products can’t be relied upon at all.
I’m sure we all get caught out sometimes, but the less often, the better!
PS: we write this, of course, before seeing the results of your voting. Maybe it won’t be a “Muir Glen Organic” sweep in the polls. But either way, it’s a call to vigilance, and a “very good, carry on” to everyone who does this already
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The Myth of Normal – by Dr. Gabor Maté and Daniel Maté
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A lot of popular beliefs (and books!) start with the assumption that everyone is, broadly speaking, “normal”. That major diversions from “normal” happen only to other people… And that minor diversions from “normal” are just something to suck up and get over—magically effecting a return to “normalcy”.
Dr. Maté, however, will have none of these unhelpful brush-offs, and observes that in fact most if not all of us have been battered by the fates one way or another. We just:
- note that we have more similarities than differences, and
- tend to hide our own differences (to be accepted) or overlook other people’s (to make them more acceptable).
How is this more helpful? Well, the above approach isn’t always, but Mate has an improvement to offer:
We must see flawed humans (including ourselves) as the product of our environments… and/but see this a reason to look at improving those environments!
Beyond that…
The final nine chapters of the books he devotes to “pathways to wholeness” and, in a nutshell, recovery. Recovery from whatever it was for you. And if you’ve had a life free from anything that needs recovering from, then congratulations! You doubtlessly have at least one loved one who wasn’t so lucky, though, so this book still makes for excellent reading.
Dr. Maté was awarded the Order of Canada for his medical work and writing. His work has mostly been about addiction, trauma, stress, and childhood development. He co-wrote this book with his son, Daniel.
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Rapamycin Can Slow Aging By 20% (But Watch Out)
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Rapamycin’s Pros & Cons
Rapamycin is generally heralded as a wonderdrug that (according to best evidence so far) can slow down aging, potentially adding decades to human lifespan—and yes, healthspan.
It comes from a kind of soil bacteria, which in turn comes from the island of Rapa Nui (a Chilean territory best known for its monumental moai statues), hence the name rapamycin.
Does it work?
Yes! Probably! With catches!
Like most drugs that are tested for longevity-inducing properties, research in humans is very slow. Of course for drugs in general, they must go through in vitro and in vivo animal testing first before they can progress to human randomized clinical trials, but for longevity-inducing drugs, it’s tricky to even test in humans, without waiting entire human lifetimes for the results.
Nevertheless, mouse studies are promising:
Rapamycin: An InhibiTOR of Aging Emerges From the Soil of Easter Island
(“Easter Island” is another name given to the island of Rapa Nui)
That’s not a keysmash in the middle there, it’s a reference to rapamycin’s inhibitory effect on the kinase mechanistic target of rapamycin, sometimes called the mammalian target of rapamycin, and either way generally abbreviated to “mTOR”—also known as “FK506-binding protein 12-rapamycin-associated protein 1” or “FRAP1“ to its friends, but we’re going to stick with “mTOR”.
What’s relevant about this is that mTOR regulates cell growth, cell proliferation, cell motility, cell survival, protein synthesis, autophagy, and transcription.
Don’t those words usually get associated with cancer?
They do indeed! Rapamycin and its analogs have well-demonstrated anti-cancer potential:
❝Rapamycin, the naturally occurring inhibitor of mTOR, along with a number of recently developed rapamycin analogs (rapalogs) consisting of synthetically derived compounds containing minor chemical modifications to the parent structure, inhibit the growth of cell lines derived from multiple tumor types in vitro, and tumor models in vivo.
Results from clinical trials indicate that the rapalogs may be useful for the treatment of subsets of certain types of cancer.❞
…and as such, gets used sometimes as an anticancer drug—especially against renal cancer. See also:
Research perspective: Cancer prevention with rapamycin
What’s the catch?
Aside from the fact that its longevity-inducing effects are not yet proven in humans, the mouse models find its longevity effects to be sex-specific, extending the life of male mice but not female ones:
Rapamycin‐mediated mouse lifespan extension: Late‐life dosage regimes with sex‐specific effects
One hypothesis about this is that it may have at least partially to do with rapamycin’s immunomodulatory effect, bearing in mind that estrogen is immune-enhancing and testosterone is immunosuppressant.
And rapamycin? That’s another catch: it is an immunosuppressant.
This goes in rapamycin’s favor for its use to avoiding rejection when it comes to some transplants (most notably including for kidneys), though the very same immunosuppressant effect is a reason it is contraindicated for certain other transplants (such as in liver or lung transplants), where it can lead to an unacceptable increase in risk of lymphoma and other malignancies:
Prescribing Information: Rapamune, Sirolimus Solution / Sirolimus Tablet
(Sirolimus is another name for rapamycin, and Rapamune is a brand name)
What does this mean for the future?
Researchers think that rapamycin may be able to extend human lifespan to a more comfortable 120–125 years, but acknowledge there’s quite a jump to get there from the current mouse studies, and given the current drawbacks of sex-specificity and immunosuppression:
Advances in anti-aging: Rapamycin shows potential to extend lifespan and improve health
Noteworthily, rapamycin has also shown promise in simultaneously staving off certain diseases associated most strongly with aging, including Alzheimer’s and cardiac disease—or even, starting earlier, to delay menopause, in turn kicking back everything else that has an uptick in risk peri- or post-menopause:
Effect of Rapamycin in Ovarian Aging (Rapamycin)
👆 an upcoming study whose results are thus not yet published, but this is to give an idea of where research is currently at. See also:
Pilot Study Evaluates Weekly Pill to Slow Ovarian Aging, Delay Menopause
Where can I try it?
Not from Amazon, that’s for sure!
It’s still tightly regulated, but you can speak with your physician, especially if you are at risk of cancer, especially if kidney cancer, about potentially being prescribed it as a preventative—they will be able to advise about safety and applicability in your personal case.
Alternatively, you can try getting your name on the list for upcoming studies, like the one above. ClinicalTrials.gov is a great place to watch out for those.
Meanwhile, take care!
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Guava vs Passion Fruit – Which is Healthier?
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Our Verdict
When comparing guava to passion fruit, we picked the guava.
Why?
There aren’t many fruits that can beat passion fruit for nutritional density! And even in this case, it wasn’t completely so in every category:
In terms of macros, passion fruit has more carbs and fiber, the ratio of which give it the slightly lower glycemic index. Thus, a modest win for passion fruit in this category.
In the category of vitamins, guava has more of vitamins B1, B5, B6, B9, C, E, and K, while passion fruit has more of vitamins A, B2, and B3. A clear win for guava this time.
When it comes to minerals, it’s a little closer, but: guava has more calcium, copper, manganese, potassium, and zinc, while passion fruit has more iron, magnesium, and phosphorus. So, another win for guava.
Adding up the sections makes for guava winning the day, but by all means enjoy either or both; diversity is good!
Want to learn more?
You might like to read:
Fruit Is Healthy; Juice Isn’t (Here’s Why)
Enjoy!
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