
The Real Benefit Of Genetic Testing
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Genetic Testing: Health Benefits & Methods
Genetic testing is an oft-derided American pastime, but there’s a lot more to it than finding out about your ancestry!
Note: because there are relatively few companies offering health-related genetic testing services, and we are talking about the benefits of those services, some of this main feature may seem like an advert.
It’s not; none of those companies are sponsoring us, and if any of them become a sponsor at some point, we’ll make it clear and put it in the clearly-marked sponsor segment.
As ever, our only goal here is to provide science-backed information, to enable you to make your own, well-informed, decisions.
Health genomics & genetic testing
The basic goal of health genomics and genetic testing is to learn:
- What genetic conditions you have
- Clearcut genetic conditions, such as Fragile X syndrome, or Huntington’s disease
- What genetic predispositions you have
- Such as an increased/decreased risk for various kinds of cancer, diabetes, heart conditions, and so forth
- What genetic traits you have
- These may range from “blue eyes” to “superathlete muscle type”
- More specifically, pharmacogenomic information
- For example, “fast caffeine metabolizer” or “clopidogrel (Plavix) non-responder” (i.e., that drug simply will not work for you)
Wait, what’s the difference between health genomics and genetic testing?
- Health genomics is the science of how our genes affect our health.
- Genetic testing can be broadly defined as the means of finding out which genes we have.
A quick snippet…
More specifically, a lot of these services look at which single nucleotide polymorphisms (SNPs, pronounced “snips”) we have. While we share almost all of our DNA with each other (and indeed, with most vertebrates), our polymorphisms are the bits that differ, and are the bits that, genetically speaking, make us different.
So, by looking just at the SNPs, it means we “only” need to look at about 3,000,000 DNA positions, and not our entire genome. For perspective, those 3,000,000 DNA positions make up about 0.1% of our whole genome, so without focusing on SNPs, the task would be 1000x harder.
For example, the kind of information that this sort of testing may give you, includes (to look at some “popular” SNPs):
- rs53576 in the oxytocin receptor influences social behavior and personality
- rs7412 and rs429358 can raise the risk of Alzheimer’s disease by more than 10x
- rs6152 can influence baldness
- rs333 resistance to HIV
- rs1800497 in a dopamine receptor may influence the sense of pleasure
- rs1805007 determines red hair and sensitivity to anesthetics
- rs9939609 triggers obesity and type-2 diabetes
- rs662799 prevents weight gain from high fat diets
- rs12255372 linked to type-2 diabetes and breast cancer
- rs1799971 makes alcohol cravings stronger
- rs17822931 determines earwax, sweating and body odor
- rs1333049 coronary heart disease
- rs1051730 and rs3750344 nicotine dependence
- rs4988235 lactose intolerance
(You can learn about these and more than 100,000 other SNPs at SNPedia.com)
I don’t know what SNPs I have, and am disinclined to look them up one by one!
The first step to knowing, is to get your DNA out of your body and into a genetic testing service. This is usually done by saliva or blood sample. This writer got hers done many years ago by 23andMe and was very happy with that service, but there are plenty of other options.
Healthline did an independent review of the most popular companies, so you might like to check out:
Healthline: Best DNA Testing Kits of 2023
Those companies will give you some basic information, such as “6x higher breast cancer risk” or “3x lower age-related macular degeneration risk” etc.
However, to really get bang-for-buck, what you want to do next is:
- Get your raw genetic data (the companies above should provide it); this will probably look like a big text file full of As, Cs, Gs, and Ts, but it make take another form.
- Upload it to Promethease. When this writer got hers done , the cost was $2; that price has now gone up to a whopping $12.
- You will then get a report that will cross-reference your data with everything known about SNPs, and give a supremely comprehensive, readable-to-the-human-eye, explanation of what it all means for you—from much more specific health risk prognostics, to more trivial things like whether you can roll your tongue or smell decomposed asparagus metabolites in urine.
A note on privacy: anything you upload to Promethease will be anonymized, and/but in doing so, you consent to it going into the grand scientific open-source bank of “things we know about the human genome”, and thus contribute to the overall sample size of genetic data.
In our opinion, it means you’re doing your bit for science, without personal risk. But your opinion may differ, and that’s your decision to make.
Lastly, on the pros and cons of pharmacogenetic testing specifically:
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Beyond Supplements: The Real Immune-Boosters!
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The Real Immune-Boosters
What comes to your mind when we say “immune support”? Vitamin C and maybe zinc? Those have their place, but there are things we can do that are a lot more important!
It’s just, these things are not talked about as much, because stores can’t sell them to you
Sleep
One of the biggest difference-makers. Get good sleep! Getting at least 7 hours decent sleep (not lying in bed, not counting interruptions to sleep as part of the sleep duration) can improve your immune system by three or four times.
Put another way, people are 3–4 times more likely to get sick if they get less sleep than that on average.
Check it out: Behaviorally Assessed Sleep and Susceptibility to the Common Cold
Eat an anti-inflammatory diet
In short, for most of us this means lots of whole plant foods (lots of fiber), and limited sugar, flour, alcohol.
For more details, you can see our main feature on this: Keep Inflammation At Bay!
You may wonder why eating to reduce inflammation (inflammation is a form of immune response) will help improve immune response. Put it this way:
If your town’s fire service is called out eleventy-two times per day to deal with things that are not, in fact, fires, then when there is a fire, they will be already exhausted, and will not do their job so well.
Look after your gut microbiota
Additionally, healthy gut microbiota (fostered by the same diet we just described) help keep your body pathogen-free, by avoiding “leaky gut syndrome” that occurs when, for example, C. albicans (you do not want this in your gut, and it thrives on the things we just told you to avoid) puts its roots through your intestinal walls, making holes in them. And through those holes? You definitely do not want bacteria from your intestines going into the rest of your body.
See also: Gut Health 101
Actually get that moderate exercise
There’s definitely a sweet-spot here, because too much exercise will also exhaust you and deplete your body’s resources. However, the famous “150 minutes per week” (so, a little over 20 minutes per day, or 25 minutes per day with one day off) will make a big difference.
See: Exercise and the Regulation of Immune Functions
Manage your stress levels (good and bad!)
This one swings both ways:
- Acute stress (like a cold shower) is good for immune response. Think of it like a fire drill for your body.
- Chronic stress (“the general everything” persistently stressful in life) is bad for immune response. This is the fire drill that never ends. Your body’s going to know what to do really well, but it’s going to be exhausted already by the time an actual threat hits.
Read more: Effects of Stress on Immune Function: the Good, the Bad, and the Beautiful
Supplement, yes.
These are far less critical than the above things, but are also helpful. Good things to take include:
Enjoy, and stay well!
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Watch Out For Lipedema
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Lipedema occurs mostly in women, mostly in times of hormonal change, with increasing risk as time goes by (so for example, puberty yields a lower risk than pregnancy, which yields a lower risk than menopause).
Its name literally means “fat swelling”, and can easily be mistaken for obesity or, in its earlier stages, just pain old cellulite.
Cellulite, by the way, is completely harmless and is also not, per se, an indicator of bad health. But if you have it and don’t like it, you can reduce it:
Obesity is more of a complex matter, and one that we’ve covered here:
Lipedema is actively harmful
Lipedema can become a big problem, because lifestyle change does not reduce lipedema fat, the fat is painful, can lead to obesity if one was not already obese, causes gait and joint abnormalities, causes fatigue, can lead to lymphedema (beyond the scope of today’s article—perhaps another time!) and very much psychosocial distress.
Like many conditions that mostly affect women, the science is… Well, here’s a recent example review that was conducted and published:
Fun fact: in Romanian there is an expression “one eye is laughing; the other is crying”, and it seems appropriate here.
Spot the signs
Because it’s most readily mistaken for cellulite in first presentation, let’s look at the differences between them:
- Cellulite is characterized by dimpled, bumpy, or even skin; lipedema is the same but with swelling too.
- Cellulite is a connective tissue condition; lipedema is too (at least in part), but also involves the abnormal accumulation and deposition of fat cells, rather than just pulling some down a bit.
- Cellulite has no additional symptoms; lipedema soon also brings swollen limbs, joint pain, and/or skin that’s “spongy” and easily bruised.
What to do about it
First, get it checked out by a doctor.
If the doctor says it is just cellulite or obesity, ask them what difference(s) they are basing that on, and ask that they confirm in writing having dismissed your concerns (having this will be handy later if it turns out to be lipedema after all).
If it is lipedema, you will want to catch it early; there is no known cure, but advanced symptoms are a lot easier to keep at bay than they are to reverse once they’ve shown up.
Weight maintenance, skin care (including good hydration), and compression therapy have all been shown to help slow the progression.
If it is allowed to progress unhindered, that’s when a lot more fat accumulation and joint pain is likely to occur. Liposuction and surgery are options, but even they are only a temporary solution, and are obviously not fun things to have to go through.
Prevention is, as ever, much better than
curetreatment ← because there is no known cureOne last thing
Lipedema’s main risk factor is genetic. The bad news is, there’s not much that can be done about that for now, but the good news is, you can at least get the heads-up about whether you are at increased risk or not, and be especially vigilant if you’re in the increased risk group. See also:
One Test, Many Warnings: The Real Benefit Of Genetic Testing
Take care!
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The Circadian Diabetes Code – by Dr. Satchin Panda
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We have previously reviewed Dr. Panda’s “The Circadian Code” which pertains to the circadian rhythms (yes, plural) in general; this one uses much of the same research, but with a strong focus on the implications for blood sugar management.
It’s first a primer in diabetes (and prediabetes, and, in contrast, what things should look like if healthy). You’ll understand about glucose metabolism and glycogen and insulin and more; you’ll understand what blood sugar readings mean, and you’ll know what an Hb1AC count actually is and what it should look like too, things like that.
After that, it’s indeed about what the subtitle promises: the right times to eat (and what to eat), when to exercise (and how, at which time), and how to optimize your sleep in the context of circadian rhythm and blood sugar management.
You may be wondering: why does circadian rhythm matter for blood sugars? And the answer is explained at some length in the first part of the book, but to oversimplify greatly: your body needs energy all the time, no matter when it was that you last ate. Thus, it has to organize its energy reserves to that at all times you can 1) function, on a cellular level 2) maintain a steady balance of sugar in your blood despite using it at slightly higher or lower levels at different times of day. Because the basal metabolic rate accounts for most of our energy use, the body has to plan for a base rate of so much energy per day, and to do that, it needs to know what a day is. Dr. Panda explains this in detail (the marvels of PER proteins and all that), but basically, that’s the relevance of circadian rhythm.
However, it’s not all theory and biochemistry; there is also a 12-week program to reverse prediabetes and type 2 diabetes (it will not, of course, reverse Type 1 Diabetes, sorry—but the program will still be beneficial even in that case, since more even blood sugars means fewer woes).
They style is friendly and clear, explaining the science simply, yet without patronizing the reader. References are given, with claims sourced in an extensive bibliography.
Bottom line: if you or a loved one have diabetes or prediabetes, or just have a strong desire to avoid getting such and generally keep your metabolic health in good order, this book will definitely help.
Click here to check out The Diabetes Code, and enjoy better blood sugar health than ever!
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Beyond Guarding Against Dementia
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When Age’s Brain-Changes Come Knocking
This is Dr. Amy Friday. She’s a psychologist, specializing in geropsychology and neuropsychological assessments.
In other words, she helps people optimize their aging experience, particularly in the context of brain changes as we get older.
What does she want us to know?
First: be not afraid
Ominous first words, but the fact is, there’s a lot to find scary about the prospect of memory loss, dementia, and death.
However, as she points out:
- Death will come for us all sooner or later, barring technology as yet unknown
- Dementia can be avoided, or at least stalled, or at least worked around
- Memory loss, as per the above, can be avoided/stalled/managed
We’ve written a little on these topics too:
…or if the death is not yours:
As for avoiding dementia, the below-linked feature is about Alzheimer’s in particular (which accounts for more than half of all cases of dementia), but the advice goes for most of the other kinds too:
How To Reduce Your Alzheimer’s Risk
And finally, about memory loss specifically:
How To Boost Your Memory Immediately (Without Supplements)
this one is especially about cementing into one’s brain the kinds of memories that people most fear losing with age. People don’t worry about forgetting their PIN codes; they worry about forgetting their cherished memories with loved ones. So, if that’s important to you, do consider checking out this one!
What is that about managing or working around the symptoms?
If we’re missing a limb, we (usually) get a prosthetic, and/or learn how to operate without that limb.
If we’re missing sight or hearing, partially or fully, there are disability aids for those kinds of things too (glasses are a disability aid! Something being very common does not make it not a disability; you literally have less of an ability—in this case, the ability to see), and/or we learn how to operate with our different (or missing) sense.
Dr. Friday makes the case for this being the same with memory loss, dementia, and other age-related symptoms (reduced focus, increased mental fatigue, etc):
❝We are all screwed up. Here’s my flavor … what’s yours? This is a favorite saying of mine, because we ARE all screwed up in one way or another, and when we acknowledge it we can feel closer in our screwed-up-edness.
We are all experiencing “normal aging,” so that tip-of-the-tongue phenomenon that starts in our thirties and slowly gets worse is REAL. But what if you’re having more problems than normal aging? Is it time to throw in the towel and hide? I’m hoping that there is a group of people who say HELL NO to that idea.
Let’s use lessons from research and clinical practice to help all of us work around our weaknesses, and capitalize on our strengths. ❞
Examples of this might include:
- Writing down the things most important to you (a short list of information and/or statements that you feel define you and what matters most to you), so that you can read it later
- Making sure you have support (partner, family, friends, etc) who are on the same page about this topic—and thus will actually support you and advocate for you, instead of arguing about what is in your best interest without consulting you.
- Labelling stuff around the house, so that you get less confused about what is what and where it is
- Having a named go-to advocate that you can call / ask to be called, if you are in trouble somewhere and need help that you can rely on
- Getting a specialized, simpler bank account; hiring an accountant if relevant and practicable.
The thing is, we all want to keep control. Sometimes we can do that! Sometimes we can’t, and if we’re going to lose some aspect of control, it’ll generally go a lot better if we do it on our own terms, so that we ourselves can look out for future-us in our planning.
Want to know more?
You might enjoy her blog, which includes also links to her many videos on the topic, including such items as:
- Neuroplasticity – #1 Way To Increase Brain Health
- Which Diet PREVENTS Alzheimer’s? | Best Brain Health Diet
- Stop Anxiety About Dementia & Do I Have Dementia?
For the rest, see:
This Beautiful Brain | The Science Of Brain Health
Enjoy!
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Resistance Beyond Weights
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Resistance, Your Way
We’ve talked before about the importance of resistance training:
Resistance Is Useful! (Especially As We Get Older)
And we’ve even talked about how to make resistance training more effective:
(High Intensity Interval Training, but make it High Intensity Resistance Training)
Which resistance training exercises are best?
There are two reasonable correct answers here:
- The resistance training exercises that you will actually do (because it’s no good knowing the best exercise ever if you’re not going to do it because it is in some way offputting to you)
- The resistance training exercises that will prevent you from getting a broken bone in the event of some accident or incident
This latter is interesting, because when people think resistance training, the usually immediate go-to exercises are often things like the bench press, or the chest machine in the gym.
But ask yourself: how often do we hear about some friend or relative who in their old age has broken their humerus?
It can happen, for sure, but it’s not as often as breaking a hip, a tarsal (ankle bones), or a carpal (wrist bones).
So, how can we train to make those bones strong?
Strong bones grow under strong muscles
When archaeologists dig up a skeleton from a thousand years ago, one of the occupations that’s easy to recognize is an archer. Why?
An archer has an unusual frequent exercise: pushing with their left arm while pulling with their right arm. This will strengthen different muscles on each side, and thus, increase bone density in different places on each arm. The left first metacarpal and right first and second metacarpals and phalanges are also a giveaway.
This is because: one cannot grow strong muscles on weak bones (or else the muscles would just break the bones), so training muscles will force the body to strengthen the relevant bones.
So: if you want strong bones, train the muscles attached to those bones
This answers the question of “how am I supposed to exercise my hips” etc.
Weights, bodyweight, resistance bands
If you go to the gym, there’s a machine for everything, and a member of gym staff will be able to advise which of their machines will strengthen which muscles.
If you train with free weights at home:
- Wrist curls (forearm supported and stationary, lifting a dumbbell in your hand, palm-upwards) will strengthen the wrist
- The farmer’s walk (carrying a heavy weight in each hand) will also strengthen your wrist
- A modified version of this involves holding the weight with just your fingertips, and then raising and lowering it by curling and uncurling your fingers)
- Lateral leg raises (you will need ankle-weights for this) will strengthen your ankles and your hips, as will hip abductions (as in today’s featured video), especially with a weight attached.
- Ankle raises (going up on your tip-toes and down again, repeat) while holding weights in your hands will strengthen your ankles
If you don’t like weights:
- Press-ups will strengthen your wrists
- Fingertip press-ups are even better: to do these, do your press-ups as normal, except that the only parts of your hands in contact with the ground are your fingertips
- This same exercise can be done the other way around, by doing pull-ups
- And that same “even better” works by doing pull-ups, but holding the bar only with one’s fingertips, and curling one’s fingers to raise oneself up
- Lateral leg raises and hip abductions can be done with a resistance band instead of with weights. The great thing about these is that whereas weights are a fixed weight, resistance bands will always provide the right amount of resistance (because if it’s too easy, you just raise your leg further until it becomes difficult again, since the resistance offered is proportional to how much tension the band is under).
Remember, resistance training is still resistance training even if “all” you’re resisting is gravity!
If it fells like work, then it’s working
As for the rest of preparing to get older?
Check out:
Training Mobility Ready For Later Life
Take care!
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I’m iron deficient. Which supplements will work best for me and how should I take them?
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Iron deficiency is common and can be debilitating. It mainly affects women. One in three premenopausal women are low in iron compared to just 5% of Australian men. Iron deficiency particularly affects teenage girls, women who do a lot of exercise and those who are pregnant.
The body needs iron to make new red blood cells, and to support energy production, the immune system and cognitive function. If you’re low, you may experience a range of symptoms including fatigue, weakness, shortness of breath, headache, irregular heartbeat and reduced concentration.
If a blood test shows you’re iron deficient, your doctor may recommend you start taking an oral iron supplement. But should you take a tablet or a liquid? With food or not? And when is the best time of day?
Here are some tips to help you work out how, when and what iron supplement to take.
LittlePigPower/Shutterstock How do I pick the right iron supplement?
The iron in your body is called “elemental iron”. Choosing the right oral supplement and dose will depend on how much elemental iron it has – your doctor will advise exactly how much you need.
The sweet spot is between 60-120 mg of elemental iron. Any less and the supplement won’t be effective in topping up your iron levels. Any higher and you risk gastrointestinal symptoms such as diarrhoea, cramping and stomach pain.
Low iron can especially affect people during pregnancy and women who do a lot of sport. Kamil Macniak/Shutterstock In Australia, iron salts are the most common oral supplements because they are cheap, effective and come in different delivery methods (tablets, capsules, liquid formulas). The iron salts you are most likely to find in your local chemist are ferrous sulfate (~20% elemental iron), ferrous gluconate (~12%) and ferrous fumarate (~33%).
These formulations all work similarly, so your choice should come down to dose and cost.
Many multivitamins may look like an iron supplement, but it’s important to note they usually have too little iron – usually less than 20 mg – to correct an iron deficiency.
Should I take tablets or liquid formulas?
Iron contained within a tablet is just as well absorbed as iron found in a liquid supplement. Choosing the right one usually comes down to personal preference.
The main difference is that liquid formulas tend to contain less iron than tablets. That means you might need to take more of the product to get the right dose, so using a liquid supplement could work out to be more expensive in the long term.
What should I eat with my iron supplement?
Research has shown you will absorb more of the iron in your supplement if you take it on an empty stomach. But this can cause more gastrointestinal issues, so might not be practical for everyone.
If you do take your supplement with meals, it’s important to think about what types of food will boost – rather than limit – iron absorption. For example, taking the supplement alongside vitamin C improves your body’s ability to absorb it.
Some supplements already contain vitamin C. Otherwise you could take the supplement along with a glass of orange juice, or other vitamin C-rich foods.
Taking your supplement alongside foods rich in vitamin C, like orange juice or kiwifruit, can help your body absorb the iron. Anete Lusina/Pexels On the other hand, tea, coffee and calcium all decrease the body’s ability to absorb iron. So you should try to limit these close to the time you take your supplement.
Should I take my supplement in the morning or evening?
The best time of day to take your supplement is in the morning. The body can absorb significantly more iron earlier in the day, when concentrations of hepcidin (the main hormone that regulates iron) are at their lowest.
Exercise also affects the hormone that regulates iron. That means taking your iron supplement after exercising can limit your ability to absorb it. Taking your supplement in the hours following exercise will mean significantly poorer absorption, especially if you take it between two and five hours after you stop.
Our research has shown if you exercise every day, the best time to take your supplement is in the morning before training, or immediately after (within 30 minutes).
My supplements are upsetting my stomach. What should I do?
If you experience gastrointestinal side effects such as diarrhoea or cramps when you take iron supplements, you may want to consider taking your supplement every second day, rather than daily.
Taking a supplement every day is still the fastest way to restore your iron levels. But a recent study has shown taking the same total dose can be just as effective when it’s taken on alternate days. For example, taking a supplement every day for three months works as well as every second day for six months. This results in fewer side effects.
Oral iron supplements can be a cheap and easy way to correct an iron deficiency. But ensuring you are taking the right product, under the right conditions, is crucial for their success.
It’s also important to check your iron levels prior to commencing iron supplementation and do so only under medical advice. In large amounts, iron can be toxic, so you don’t want to be consuming additional iron if your body doesn’t need it.
If you think you may be low on iron, talk to your GP to find out your best options.
Alannah McKay, Postdoctoral Research Fellow, Sports Nutrition, Australian Catholic University
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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