Frozen/Thawed/Refrozen Meat: How Much Is Safety, And How Much Is Taste?
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What You Can (And Can’t) Safely Do With Frozen Meat
Yesterday, we asked you:
❝You have meat in the freezer. How long is it really safe to keep it?❞
…and got a range of answers, mostly indicating to a) follow the instructions (a very safe general policy) and b) do not refreeze if thawed because that would be unsafe. Fewer respondents indicated that meat could be kept for much longer than guidelines say, or conversely, that it should only be kept for weeks or less.
So, what does the science say?
Meat can be kept indefinitely (for all intents and purposes) in a freezer; it just might get tougher: True or False?
False, assuming we are talking about a normal household electrical freezer that bottoms out at about -18℃ / 0℉.
Fun fact: cryobiologists cryopreserve tissue samples (so basically, meat) at -196℃ / -320℉, and down at those temperatures, the tissues will last a lot longer than you will (and, for all practical purposes: indefinitely). There are other complications with doing so (such as getting the sample through the glass transition point without cracking it during the vitrification process) but those are beyond the scope of this article.
If you remember back to your physics or perhaps chemistry classes at school, you’ll know that molecules move more quickly at higher temperatures, and more slowly at lower ones, only approaching true stillness as they near absolute zero (-273℃ / -459℉ / 0K ← we’re not saying it’s ok, although it is; rather, that is zero kelvin; no degree sign is used with kelvins)
That means that when food is frozen, the internal processes aren’t truly paused; it’s just slowed to a point of near imperceptibility.
So, all the way up at the relatively warm temperatures of a household freezer, a lot of processes are still going on.
What this means in practical terms: those guidelines saying “keep in the freezer for up to 4 months”, “keep in the freezer for up to 9 months”, “keep in the freezer for up to 12 months” etc are being honest with you.
More or less, anyway! They’ll usually underestimate a little to be on the safe side—but so should you.
Bad things start happening within weeks at most: True or False?
False, for all practical purposes. Again, assuming a normal and properly-working household freezer as described above.
(True, technically but misleadingly: the bad things never stopped; they just slowed down to a near imperceptible pace—again, as described above)
By “bad” here we should clarify we mean “dangerous”. One subscriber wrote:
❝Meat starts losing color and flavor after being in the freezer for too long. I keep meat in the freezer for about 2 months at the most❞
…and as a matter of taste, that’s fair enough!
It is unsafe to refreeze meat that has been thawed: True or False?
False! Assuming it has otherwise been kept chilled, just the same as for fresh meat.
Food poisoning comes from bacteria, and there is nothing about the meat previously having been frozen that will make it now have more bacteria.
That means, for example…
- if it was thawed (but chilled) for a period of time, treat it like you would any other meat that has been chilled for that period of time (so probably: use it or freeze it, unless it’s been more than a few days)
- if it was thawed (and at room temperature) for a period of time, treat it like you would any other meat that has been at room temperature for that period of time (so probably: throw it out, unless the period of time is very small indeed)
The USDA gives for 2 hours max at room temperature before considering it unsalvageable, by the way.
However! Whenever you freeze meat (or almost anything with cells, really), ice crystals will form in and between cells. How much ice crystallization occurs depends on several variables, with how much water there is present in the food is usually the biggest factor (remember that animal cells are—just like us—mostly water).
Those ice crystals will damage the cell walls, causing the food to lose structural integrity. When you thaw it out, the ice crystals will disappear but the damage will be left behind (this is what “freezer burn” is).
So if your food seems a little “squishy” after having been frozen and thawed, that’s why. It’s not rotten; it’s just been stabbed countless times on a microscopic level.
The more times you freeze and thaw and refreeze food, the more this will happen. Your food will degrade in structural integrity each time, but the safety of it won’t have changed meaningfully.
Want to know more?
Further reading:
You can thaw and refreeze meat: five food safety myths busted
Take care!
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Ear Candling: Is It Safe & Does It Work?
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Does This Practice Really Hold A Candle To Evidence-Based Medicine?
In Tuesday’s newsletter, we asked you your opinion of ear candling, and got the above-depicted, below-described set of responses:
- Exactly 50% said “Under no circumstances should you put things in your ear and set fire to them”
- About 38% said “It is a safe, drug-free way to keep the ears free from earwax and pathogens”
- About 13% said “Done correctly, thermal-auricular therapy is harmless and potentially beneficial”
This means that if we add the two positive-to-candling answers together, it’s a perfect 50:50 split between “do it” and “don’t do it”.
(Yes, 38%+13%=51%, but that’s because we round to the nearest integer in these reports, and more precisely it was 37.5% and 12.5%)
So, with the vote split, what does the science say?
First, a quick bit of background: nobody seems keen to admit to having invented this. One of the major manufacturers of ear candles refers to them as “Hopi” candles, which the actual Hopi tribe has spent a long time asking them not to do, as it is not and never has been used by the Hopi people. Other proposed origins offered by advocates of ear candling include Traditional Chinese Medicine (not used), Ancient Egypt (no evidence of such whatsoever), and Atlantis:
Quackwatch | Why Ear Candling Is Not A Good Idea
It is a safe, drug-free way to keep the ears free from earwax and pathogens: True or False?
False! In a lot of cases of alternative therapy claims, there’s an absence of evidence that doesn’t necessarily disprove the treatment. In this case, however, it’s not even an open matter; its claims have been actively disproven by experimentation:
- It doesn’t remove earwax; on the contrary, experimentation “showed no removal of cerumen from the external auditory canal. Candle wax was actually deposited in some“
- It doesn’t remove pathogens, and the proposed mechanism of action for removing pathogens, that of the “chimney effect”: the idea that the burning candle creates a vacuum that draws wax out of the ear along with debris and bacteria, simply does not work; on the contrary, “Tympanometric measurements in an ear canal model demonstrated that ear candles do not produce negative pressure”.
- It isn’t safe; on the contrary, “Ear candles have no benefit in the management of cerumen and may result in serious injury”
In a medium-sized survey (n=122), the following injuries were reported:
- 13 x burns
- 7 x occlusion of the ear canal
- 6 x temporary hearing loss
- 3 x otitis externa (this also called “swimmer’s ear”, and is an inflammation of the ear, accompanied by pain and swelling)
- 1 x tympanic membrane perforation
Indeed, authors of one paper concluded:
❝Ear candling appears to be popular and is heavily advertised with claims that could seem scientific to lay people. However, its claimed mechanism of action has not been verified, no positive clinical effect has been reliably recorded, and it is associated with considerable risk.
No evidence suggests that ear candling is an effective treatment for any condition. On this basis, we believe it can do more harm than good and we recommend that GPs discourage its use❞
Source: Canadian Family Physician | Ear Candling
Under no circumstances should you put things in your ear and set fire to them: True or False?
True! It’s generally considered good advice to not put objects in general in your ears.
Inserting flaming objects is a definite no-no. Please leave that for the Cirque du Soleil.
You may be thinking, “but I have done this and suffered no ill effects”, which seems reasonable, but is an example of survivorship bias in action—it doesn’t make the thing in question any safer, it just means you were one of the one of the ones who got away unscathed.
If you’re wondering what to do instead… Ear oils can help with the removal of earwax (if you don’t want to go get it sucked out at a clinic—the industry standard is to use a suction device, which actually does what ear candles claim to do). For information on safely getting rid of earwax, see our previous article:
Take care!
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The Osteoporosis Breakthrough – by Dr. Doug Lucas
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“Osteoporosis” and “break” often don’t go well together, but here they do. So, what’s the breakthrough here?
There isn’t one, honestly. But if we overlook the marketing choices and focus on the book itself, the content here is genuinely good:
The book offers a comprehensive multivector approach to combatting osteoporosis, e.g:
- Diet
- Exercise
- Other lifestyle considerations
- Supplements
- Hormones
- Drugs
The author considers drugs a good and important tool for some people with osteoporosis, but not most. The majority of people, he considers, will do better without drugs—by tackling things more holistically.
The advice here is sound and covers all reasonable angles without getting hung up on the idea of there being a single magical solution for all.
Bottom line: if you’re looking for a book that’s a one-stop-shop for strategies against osteoporosis, this is a good option.
Click here to check out The Osteoporosis Breakthrough, and keep your bones strong!
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World Menopause Day Health News Round-Up
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In order to provide variety in this week’s round-up, not all of this is menopause-related, but it is all important:
Menopause & CVD
Untreated menopause is associated with higher incidence of heart disease, and higher mortality. People often forget about how much estrogen does for us (well, for those of us with a physiology running on estrogen, anyway; gentlemen, your testosterone is fine for you), and think it is “just” a sex hormone, but it’s a lot more.
Read in full: Menopause transition linked to increased heart disease risk
Related: What Menopause Does To The Heart
Extraterrestrial medical technology
The much lower gravity in Earth orbit has allowed for tissue engineering techniques that Earth’s normal gravity imposes limitations on. This is big news, because it means that rather than replacing a whole liver, tissue implants could be grafted, allowing the extant liver to repair itself (something livers are famously good at, but they need enough undamaged base material to work with).
Read in full: How liver tissue from the International Space Station may transform tissue engineering
Related: How To Unfatty A Fatty Liver
One thing and then another
As if endometriosis weren’t unpleasant enough in and of itself, the endothelial dysfunction inherent to it also raises cardiovascular disease risk. This is important, because while endometriosis has (like many maladies predominantly affecting women) generally been shrugged off by the medical world as an unhappy inconvenience but not life-threatening, now we know it comes with extra existential risks too:
Read in full: Understanding cardiovascular risks in endometriosis patients
Related: What You Need To Know About Endometriosis
Push-button meditation
Unlike mindfulness meditation, listening to music is a very passive experience, and thus requires less effort from the user. And yet, it has been associated with lower perceived pain levels, lower self-reported anxiety levels, less opioid use, and measurably lower heart-rate.
Read in full: Listening to music may speed up recovery from surgery, research suggests
Related: Nobody Likes Surgery, But Here’s How To Make It Much Less Bad
Cholesterol in menopause: quality over quantity
Much like previous research has shown that the quantity of LDL is not nearly so predictive of health outcomes in women as it is in men, this study into HDL and menopausal women shows that quantity of HDL does not matter nearly so much as the quality of it.
Read in full: HDL quality, not quantity, contribute to the first sign of Alzheimer’s disease in women
Related: Statins: His & Hers? ← consistent with the above, statins (to lower LDL cholesterol) generally help more for men and produce more adverse side effects for women. So again, a case of “the actual amount of cholesterol isn’t so important for women as for men”.
Take care!
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Your Brain Is Always Listening – by Dr. Daniel Amen
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There are a lot of books on Cognitive Behavioral Therapy (CBT), so what makes this one different?
While many CBT books have a focus (as this one also does) on controlling Automatic Negative Thoughts (ANTs), this one stands out in two ways:
Firstly: Dr. Amen, a medical doctor and psychiatrist, looks not just as the thoughts and feelings side of things… but also the neurological underpinnings. This makes a difference because it gives a much more tangible handle on some of the problems that we might face.
We wouldn’t tell someone with Type 1 Diabetes that they are “just blaming their pancreas” for blood sugar woes. So what’s with the notion of “this person is just blaming their brain”? Why would be harder on ourselves (or others) for having amygdalae that are a little out of whack, or a sluggish prefrontal cortex, or an overactive anterior cingulate gyrus?
So, Dr. Amen’s understanding and insights help us look at how we can give those bits of brain what they need to perk them up or calm them down.
Secondly, rather than picture-perfect easily-solved neat-and-tidy made-up scenarios as illustrations, he uses real (messy, human) case studies.
This means that we get to see how the methods advised work in the case of, for example, a business executive who has a trauma response to public speaking, because at the age of 12 he had to stand in court and argue for why his father should not receive the death penalty.
Bottom line: if these methods can ease situations like that, maybe we can apply them usefully in our own lives, too.
Click here to check out Your Brain Is Always Listening, and take control of yours!
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Anchovies vs Sardines – Which is Healthier?
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Our Verdict
When comparing anchovies to sardines, we picked the sardines.
Why?
In terms of macros, sardines have slightly more protein and more than 2x the fat, but the fat profile is healthier than that of anchovies, meaning that the amount of saturated fat is the same, and sardines have more poly- and monounsaturated fats. Breaking it down further, sardines also have more omega-3. Unless you are for whatever reason especially keen to keep your total fat* intake down, sardines win here.
*or calories, which in this case come almost entirely from the fat, and sardines are consequently nearly 2x higher in calories.
When it comes to vitamins, sardines further distinguish themselves; anchovies have more of vitamins B2 and B3, while sardines have more of vitamins A, B1, B6, B12, B9, E, and K—in some cases, by quite large margins (especially the B12 and K, being 14x more and 26x more, respectively). A clear win for sardines.
Minerals are closer to even; anchovies have more copper, iron, and zinc, while sardines have more calcium, manganese, phosphorus, and selenium. That’s already a slight win for sardines, before we take into account that sardines’ margins of difference are also much greater than anchovies’.
In short, enjoy either in moderation if you are so inclined, but sardines win on overall nutritional density.
Want to learn more?
You might like to read:
Farmed Fish vs Wild Caught: More Important Than You Might Think
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The Food For Life Cookbook – by Dr. Tim Spector
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We’ve previously reviewed Dr. Spector’s “Food For Life”, and while that was more of an “explanatory science” book, this one takes that science (reiterating it more briefly this time, by way of introduction) and makes a cookbook of it.
The nutritional emphasis in these recipes is on two things: maximizing fiber, and maximizing plant diversity. The recipes are not all vegan or even vegetarian, but they are plant-centric, and if the reader is vegetarian/vegan, then substitutions are easy to make.
The recipes themselves are simple without being boring, and are easy to follow, with full-page photos to accompany them. The science parts are very clear, accessible, and pop-science in style.
Bottom line: if you’d like to incorporate more fiber and more plants into your diet without it being a burden, this book is great for that.
Click here to check out the Food For Life Cookbook, and get cooking for life!
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