Alzheimer’s may have once spread from person to person, but the risk of that happening today is incredibly low
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An article published this week in the prestigious journal Nature Medicine documents what is believed to be the first evidence that Alzheimer’s disease can be transmitted from person to person.
The finding arose from long-term follow up of patients who received human growth hormone (hGH) that was taken from brain tissue of deceased donors.
Preparations of donated hGH were used in medicine to treat a variety of conditions from 1959 onwards – including in Australia from the mid 60s.
The practice stopped in 1985 when it was discovered around 200 patients worldwide who had received these donations went on to develop Creuztfeldt-Jakob disease (CJD), which causes a rapidly progressive dementia. This is an otherwise extremely rare condition, affecting roughly one person in a million.
What’s CJD got to do with Alzehimer’s?
CJD is caused by prions: infective particles that are neither bacterial or viral, but consist of abnormally folded proteins that can be transmitted from cell to cell.
Other prion diseases include kuru, a dementia seen in New Guinea tribespeople caused by eating human tissue, scrapie (a disease of sheep) and variant CJD or bovine spongiform encephalopathy, otherwise known as mad cow disease. This raised public health concerns over the eating of beef products in the United Kingdom in the 1980s.
Human growth hormone used to come from donated organs
Human growth hormone (hGH) is produced in the brain by the pituitary gland. Treatments were originally prepared from purified human pituitary tissue.
But because the amount of hGH contained in a single gland is extremely small, any single dose given to any one patient could contain material from around 16,000 donated glands.
An average course of hGH treatment lasts around four years, so the chances of receiving contaminated material – even for a very rare condition such as CJD – became quite high for such people.
hGH is now manufactured synthetically in a laboratory, rather than from human tissue. So this particular mode of CJD transmission is no longer a risk.
National Cancer Institute/Unsplash
What are the latest findings about Alzheimer’s disease?
The Nature Medicine paper provides the first evidence that transmission of Alzheimer’s disease can occur via human-to-human transmission.
The authors examined the outcomes of people who received donated hGH until 1985. They found five such recipients had developed early-onset Alzheimer’s disease.
They considered other explanations for the findings but concluded donated hGH was the likely cause.
Given Alzheimer’s disease is a much more common illness than CJD, the authors presume those who received donated hGH before 1985 may be at higher risk of developing Alzheimer’s disease.
Alzheimer’s disease is caused by presence of two abnormally folded proteins: amyloid and tau. There is increasing evidence these proteins spread in the brain in a similar way to prion diseases. So the mode of transmission the authors propose is certainly plausible.
However, given the amyloid protein deposits in the brain at least 20 years before clinical Alzheimer’s disease develops, there is likely to be a considerable time lag before cases that might arise from the receipt of donated hGH become evident.
When was this process used in Australia?
In Australia, donated pituitary material was used from 1967 to 1985 to treat people with short stature and infertility.
More than 2,000 people received such treatment. Four developed CJD, the last case identified in 1991. All four cases were likely linked to a single contaminated batch.
The risks of any other cases of CJD developing now in pituitary material recipients, so long after the occurrence of the last identified case in Australia, are considered to be incredibly small.
Early-onset Alzheimer’s disease (defined as occurring before the age of 65) is uncommon, accounting for around 5% of all cases. Below the age of 50 it’s rare and likely to have a genetic contribution.
perfectlab/Shutterstock
The risk is very low – and you can’t ‘catch’ it like a virus
The Nature Medicine paper identified five cases which were diagnosed in people aged 38 to 55. This is more than could be expected by chance, but still very low in comparison to the total number of patients treated worldwide.
Although the long “incubation period” of Alzheimer’s disease may mean more similar cases may be identified in the future, the absolute risk remains very low. The main scientific interest of the article lies in the fact it’s first to demonstrate that Alzheimer’s disease can be transmitted from person to person in a similar way to prion diseases, rather than in any public health risk.
The authors were keen to emphasise, as I will, that Alzheimer’s cannot be contracted via contact with or providing care to people with Alzheimer’s disease.
Steve Macfarlane, Head of Clinical Services, Dementia Support Australia, & Associate Professor of Psychiatry, Monash University
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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Welcoming the Unwelcome – by Pema Chödrön
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There’s a lot in life that we don’t get to choose. Some things we have zero control over, like the weather. Others, we can only influence, like our health. Still yet others might give us an illusion of control, only to snatch it away, like a financial reversal or a bereavement.
How, then, to suffer those “slings and arrows of outrageous fortune” and come through the other side with an even mind and a whole heart?
Author Pema Chödrön has a guidebook for us.
Quick note: this book does not require the reader to have any particular religious faith to enjoy its benefits, but the author is a nun. As such, the way she describes things is generally within the frame of her religion. So that’s a thing to be aware of in case it might bother you. That said…
The largest part of her approach is one that psychology might describe as rational emotive behavioral therapy.
As such, we are encouraged to indeed “meet with triumph and disaster, and treat those two imposters just the same”, and more importantly, she lays out the tools for us to do so.
Does this mean not caring? No! Quite the opposite. It is expected, and even encouraged, that we might care very much. But: this book looks at how to care and remain compassionate, to others and to ourselves.
For Chödrön, welcoming the unwelcome is about de-toothing hardship by accepting it as a part of the complex tapestry of life, rather than something to be endured.
Bottom line: this book can greatly increase the reader’s ability to “go placidly amid the noise and haste” and bring peace to an often hectic world—starting with our own.
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Hoisin Sauce vs Teriyaki Sauce – Which is Healthier?
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Our Verdict
When comparing hoisin sauce to teriyaki sauce, we picked the teriyaki sauce.
Why?
Neither are great! But spoonful for spoonful, the hoisin sauce has about 5x as much sugar.
Of course, exact amounts will vary by brand, but the hoisin will invariably be much more sugary than the teriyaki.
On the flipside, the teriyaki sauce may sometimes have slightly more salt, but they are usually in approximately the same ballpark of saltiness, so this is not a big deciding factor.
As a general rule of thumb, the first few ingredients will look like this for each, respectively:
Hoisin:
- Sugar
- Water
- Soybeans
Teriyaki:
- Soy sauce (water, soybeans, salt)
- Rice wine
- Sugar
In essence: hoisin is a soy-flavored syrup, while teriyaki is a sweetened soy sauce
Wondering about that rice wine? The alcohol content is negligible, sufficiently so that teriyaki sauce is not considered alcoholic. For health purposes, it is well under the 0.05% required to be considered alcohol-free.
For religious purposes, we are not your rabbi or imam, but to our best understanding, teriyaki sauce is generally considered kosher* (the rice wine being made from rice) and halal (the rice wine being de-alcoholized by the processing, making the sauce non-intoxicating).
Want to try some?
You can compare these examples side-by-side yourself:
Enjoy!
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Which Diet? Top Diets Ranked By Experts
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A panel of 69 doctors and nutritionists examined the evidence for 38 diets, and scored them in 21 categories (e.g. best for weight loss, best for heart, best against diabetes, etc).
We’ll not keep it a mystery: the Mediterranean diet has been ranked as “best overall” for the 8th year in a row.
The Mediterranean (And Its Close Friends & Relations)
We’ve written before about the Mediterranean diet, here:
The Mediterranean Diet: What Is It Good For? ← What isn’t it good for?
👆 the above article also delineates what does and doesn’t go in a Mediterranean diet—hint, it’s not just any food from the Mediterranean region!
The Mediterranean diet’s strengths come from various factors including its good plant:animal ratio (leaning heavily on the plants), colorful fruit and veg minimally processed, and the fact that olive oil is the main source of fat:
All About Olive Oil ← pretty much one of the healthiest fats we can consume, if not healthiest all-rounder fat
The Mediterranean diet also won 1st place in various more specific categories, including:
- Best against arthritis (followed by Dr. Weil’s Anti-inflammatory, MIND, DASH)
- Best for mental health (followed by MIND, Flexitarian, DASH)
- Best against diabetes (followed by Flexitarian, DASH, MIND)
- best for liver regeneration (followed by Flexitarian, Vegan, DASH, MIND)
- Best for gut heath (followed by Vegan, DASH, Flexitarian, MIND)
If you’re not familiar with DASH and MIND, there are clues in their full names: Dietary Approaches to Stop Hypertension and Mediterranean-DASH Intervention for Neurodegenerative Delay, and as you might well suspect, they are simply tweaked variations of the Mediterranean diet:
Four Ways To Upgrade The Mediterranean ← DASH and MIND are the heart-healthiest and brain-healthiest versions of the Mediterranean; this article also includes a gut-healthiest version and a most anti-inflammatory version
What aren’t those best for?
The Mediterranean diet scored 1st or 2nd in most of the 21 categories, and usually had the other above-named diets keeping it company in the top few.
When it comes to weight loss, the Mediterranean scored 2nd place and wasn’t flanked by its usual friends and relations; instead in first place was commercial diet WeightWatchers (likely helped a lot by being also a peer support group), and in third place was the Volumetrics diet, which we wrote about here:
Some Surprising Truths About Hunger And Satiety
And when it comes to rapid weight loss specifically, the Mediterranean didn’t even feature in the top spots at all, because it’s simply not an extreme diet and it prioritizes health over shedding the pounds at any cost. The top in that category were mostly commercial diets:
- Jenny Craig
- Slimfast
- Keto
- Nutrisystem
- WeightWatchers
We’ve not as yet written about any of those commercial diets, but we have written about keto here:
Ketogenic Diet: Burning Fat Or Burning Out?
Want to know more?
You can click around, exploring by diet or by health category, here 😎
Enjoy!
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Natural Remedies and Foods for Osteoarthritis
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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
❝Natural solutions for osteoarthritis. Eg. Rosehip tea, dandelion root tea. Any others??? What foods should I absolutely leave alone?❞
We’ll do a main feature on arthritis (in both its main forms) someday soon, but meanwhile, we recommend eating for good bone/joint health and against inflammation. To that end, you might like these main features we did on those topics:
- We Are Such Stuff As Fish Are Made Of (collagen for bone and joint health)
- The Bare-Bones Truth About Osteoporosis (eating for bone health generally)
- Keep Inflammation At Bay (dietary tips for minimizing inflammation—also, our all-time most popular article to date!)
Of these, probably the last one is the most critical, and also will have the speediest effects if implemented.
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Coca-Cola vs Diet Coke – Which is Healthier?
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Our Verdict
When comparing Coca-Cola to Diet Coke, we picked the Diet Coke.
Why?
While the Diet Coke is bad, the Coca-Cola has mostly the same problems plus sugar.
The sugar in a can of Coca-Cola is 39g high-fructose corn syrup (the worst kind of sugar yet known to humanity), and of course it’s being delivered in liquid form (the most bioavailable way to get, which in this case, is bad).
To put those 39g into perspective, the daily recommended amount of sugar is 36g for men or 25g for women, according to the AHA.
The sweetener in Diet Coke is aspartame, which has had a lot of health risk accusations made against it, most of which have not stood up to scrutiny, and the main risk it does have is “it mimics sugar too well” and it can increase cravings for sweetness, and therefore higher consumption of sugars in other products. For this reason, the World Health Organization has recommended to simply reduce sugar intake without looking to artificial sweeteners to help.
Nevertheless, aspartame has been found safe (in moderate doses; the upper tolerance level would equate to more than 20 cans of diet coke per day) by food safety agencies ranging from the FDA to the EFSA, based on a large body of science.
Other problems that Diet Coke has are present in Coca-Cola too, such as its acidic nature (bad for tooth enamel) and gassy nature (messes with leptin/ghrelin balance).
Summary: the Diet Coke is relatively less unhealthy, but is still bad in numerous ways, and remains best avoided.
Read more:
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Grapefruit vs Orange – Which is Healthier?
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Our Verdict
When comparing grapefruit to orange, we picked the orange.
Why?
It’s easy, when guessing which is the healthier out of two things, to guess that the more expensive or perhaps less universally available one is the healthier. But it’s not always so, and today is one of those cases!
In terms of macros, they are very similar fruits, with almost identical levels of carbohydrates, proteins, and fats, as well as water. Looking more carefully, we find that grapefruit’s sugars contain a slightly high proportion of fructose; not enough to make it unhealthy by any means (indeed, no whole unprocessed fruit is unhealthy unless it’s literally poisonous), but it is a thing to note if we’re micro-analysing the macronutrients. Also, oranges have slightly more fiber, which is always a plus.
When it comes to vitamins, oranges stand out with more of vitamins B1, B2, B3, B6, B9, C, and E, while grapefruit boasts more vitamin A (hence its color). Still, we’re calling this category another win for oranges.
In the category of minerals, oranges again sweep with more calcium, copper, iron, magnesium, manganese, potassium, and selenium, while grapefruit has just a little more phosphorus. So, another easy win for oranges.
One final consideration that’s not shown in the nutritional values, is that grapefruit contains furanocoumarin, which can inhibit cytochrome P-450 3A4 isoenzyme and P-glycoptrotein transporters in the intestine and liver—slowing down their drug metabolism capabilities, thus effectively increasing the bioavailability of many drugs manifold. It can also be found in lower quantities in Seville (sour) oranges, and it’s not present (or at least, if it is, it’s in truly tiny quantities) in most oranges.
This may sound superficially like a good thing (improving bioavailability of things we want), but in practice it means that in the case of many drugs, if you take them with (or near in time to) grapefruit or grapefruit juice, then congratulations, you just took an overdose. This happens with a lot of meds for blood pressure, cholesterol (including statins), calcium channel-blockers, anti-depressants, benzo-family drugs, beta-blockers, and more. Oh, and Viagra, too. Which latter might sound funny, but remember, Viagra’s mechanism of action is blood pressure modulation, and that is not something you want to mess around with unduly. So, do check with your pharmacist to know if you’re on any meds that would be affected by grapefruit or grapefruit juice!
All in all, today’s sections add up to an overwhelming win for oranges!
Want to learn more?
You might like to read:
Take care!
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