Does intermittent fasting increase or decrease our risk of cancer?
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Research over the years has suggested intermittent fasting has the potential to improve our health and reduce the likelihood of developing cancer.
So what should we make of a new study in mice suggesting fasting increases the risk of cancer?
What is intermittent fasting?
Intermittent fasting means switching between times of eating and not eating. Unlike traditional diets that focus on what to eat, this approach focuses on when to eat.
There are lots of commonly used intermittent fasting schedules. The 16/8 plan means you only eat within an eight-hour window, then fast for the remaining 16 hours. Another popular option is the 5:2 diet, where you eat normally for five days then restrict calories for two days.
In Australia, poor diet contributes to 7% of all cases of disease, including coronary heart disease, stroke, type 2 diabetes, and cancers of the bowel and lung. Globally, poor diet is linked to 22% of deaths in adults over the age of 25.
Intermittent fasting has gained a lot of attention in recent years for its potential health benefits. Fasting influences metabolism, which is how your body processes food and energy. It can affect how the body absorbs nutrients from food and burns energy from sugar and fat.
What did the new study find?
The new study, published in Nature, found when mice ate again after fasting, their gut stem cells, which help repair the intestine, became more active. The stem cells were better at regenerating compared with those of mice who were either totally fasting or eating normally.
This suggests the body might be better at healing itself when eating after fasting.
However, this could also have a downside. If there are genetic mutations present, the burst of stem cell-driven regeneration after eating again might make it easier for cancer to develop.
Polyamines – small molecules important for cell growth – drive this regeneration after refeeding. These polyamines can be produced by the body, influenced by diet, or come from gut bacteria.
The findings suggest that while fasting and refeeding can improve stem cell function and regeneration, there might be a tradeoff with an increased risk of cancer, especially if fasting and refeeding cycles are repeated over time.
While this has been shown in mice, the link between intermittent fasting and cancer risk in humans is more complicated and not yet fully understood.
What has other research found?
Studies in animals have found intermittent fasting can help with weight loss, improve blood pressure and blood sugar levels, and subsequently reduce the risks of diabetes and heart disease.
Research in humans suggests intermittent fasting can reduce body weight, improve metabolic health, reduce inflammation, and enhance cellular repair processes, which remove damaged cells that could potentially turn cancerous.
However, other studies warn that the benefits of intermittent fasting are the same as what can be achieved through calorie restriction, and that there isn’t enough evidence to confirm it reduces cancer risk in humans.
What about in people with cancer?
In studies of people who have cancer, fasting has been reported to protect against the side effects of chemotherapy and improve the effectiveness of cancer treatments, while decreasing damage to healthy cells.
Prolonged fasting in some patients who have cancer has been shown to be safe and may potentially be able to decrease tumour growth.
On the other hand, some experts advise caution. Studies in mice show intermittent fasting could weaken the immune system and make the body less able to fight infection, potentially leading to worse health outcomes in people who are unwell. However, there is currently no evidence that fasting increases the risk of bacterial infections in humans.
So is it OK to try intermittent fasting?
The current view on intermittent fasting is that it can be beneficial, but experts agree more research is needed. Short-term benefits such as weight loss and better overall health are well supported. But we don’t fully understand the long-term effects, especially when it comes to cancer risk and other immune-related issues.
Since there are many different methods of intermittent fasting and people react to them differently, it’s hard to give advice that works for everyone. And because most people who participated in the studies were overweight, or had diabetes or other health problems, we don’t know how the results apply to the broader population.
For healthy people, intermittent fasting is generally considered safe. But it’s not suitable for everyone, particularly those with certain medical conditions, pregnant or breastfeeding women, and people with a history of eating disorders. So consult your health-care provider before starting any fasting program.
Amali Cooray, PhD Candidate in Genetic Engineering and Cancer, WEHI (Walter and Eliza Hall Institute of Medical Research)
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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Grains: Bread Of Life, Or Cereal Killer?
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Going Against The Grain?
In Wednesday’s newsletter, we asked you for your health-related opinion of grains (aside from any gluten-specific concerns), and got the above-depicted, below-described, set of responses:
- About 69% said “They are an important cornerstone of a healthy balanced diet”
- About 22% said “They can be enjoyed in moderation, but watch out”
- About 8% said “They are terrible health-drainers that will kill us”
So, what does the science say?
They are terrible health-drainers that will kill us: True or False?
True or False depending on the manner of their consumption!
There is a big difference between the average pizza base and a bowl of oats, for instance. Or rather, there are a lot of differences, but what’s most critical here?
The key is: refined and ultraprocessed grains are so inferior to whole grains as to be actively negative for health in most cases for most people most of the time.
But! It’s not because processing is ontologically evil (in reality: some processed foods are healthy, and some unprocessed foods are poisonous). although it is a very good general rule of thumb.
So, we need to understand the “why” behind the “key” that we just gave above, and that’s mostly about the resultant glycemic index and associated metrics (glycemic load, insulin index, etc).
In the case of refined and ultraprocessed grains, our body gains sugar faster than it can process it, and stores it wherever and however it can, like someone who has just realised that they will be entertaining a houseguest in 10 minutes and must tidy up super-rapidly by hiding things wherever they’ll fit.
And when the body tries to do this with sugar from refined grains, the result is very bad for multiple organs (most notably the liver, but the pancreas takes quite a hit too) which in turn causes damage elsewhere in the body, not to mention that we now have urgently-produced fat stored in unfortunate places like our liver and abdominal cavity when it should have gone to subcutaneous fat stores instead.
In contrast, whole grains come with fiber that slows down the absorption of the sugars, such that the body can deal with them in an ideal fashion, which usually means:
- using them immediately, or
- storing them as muscle glycogen, or
- storing them as subcutaneous fat
👆 that’s an oversimplification, but we only have so much room here.
For more on this, see:
Glycemic Index vs Glycemic Load vs Insulin Index
And for why this matters, see:
Which Sugars Are Healthier, And Which Are Just The Same?
And for fixing it, see:
They can be enjoyed in moderation, but watch out: True or False?
Technically True but functionally False:
- Technically true: “in moderation” is doing a lot of heavy lifting here. One person’s “moderation” may be another person’s “abstemiousness” or “gluttony”.
- Functionally false: while of course extreme consumption of pretty much anything is going to be bad, unless you are Cereals Georg eating 10,000 cereals each day and being a statistical outlier, the issue is not the quantity so much as the quality.
Quality, we discussed above—and that is, as we say, paramount. As for quantity however, you might want to know a baseline for “getting enough”, so…
They are an important cornerstone of a healthy balanced diet: True or False?
True! This one’s quite straightforward.
3 servings (each being 90g, or about ½ cup) of whole grains per day is associated with a 22% reduction in risk of heart disease, 5% reduction in all-cause mortality, and a lot of benefits across a lot of disease risks:
❝This meta-analysis provides further evidence that whole grain intake is associated with a reduced risk of coronary heart disease, cardiovascular disease, and total cancer, and mortality from all causes, respiratory diseases, infectious diseases, diabetes, and all non-cardiovascular, non-cancer causes.
These findings support dietary guidelines that recommend increased intake of whole grain to reduce the risk of chronic diseases and premature mortality.❞
~ Dr. Dagfinn Aune et al.
We’d like to give a lot more sources for the same findings, as well as papers for all the individual claims, but frankly, there are so many that there isn’t room. Suffice it to say, this is neither controversial nor uncertain; these benefits are well-established.
Here’s a very informative pop-science article, that also covers some of the things we discussed earlier (it shows what happens during refinement of grains) before getting on to recommendations and more citations for claims than we can fit here:
Harvard School Of Public Health | Whole Grains
“That’s all great, but what if I am concerned about gluten?”
There certainly are reasons you might be, be it because of a sensitivity, allergy, or just because perhaps you’d like to know more.
Let’s first mention: not all grains contain gluten, so it’s perfectly possible to enjoy naturally gluten-free grains (such as oats and rice) as well as gluten-free pseudocereals, which are not actually grains but do the same job in culinary and nutritional terms (such as quinoa and buckwheat, despite the latter’s name).
Finally, if you’d like to know more about gluten’s health considerations, then check out our previous mythbusting special:
Enjoy!
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Signs Of Low Estrogen In Women: What Your Skin, Hair, & Nails Are Trying To Tell You
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Skin, hair, and nails are often thought of purely as a beauty thing, but in fact they can be indicative of a lot of other aspects of health. Dr. Andrea Suarez takes us through some of them in this video about the systemic (i.e., whole-body, not just related to sex things) effects of estrogen, and/or a deficiency thereof.
Beyond the cosmetic
Low estrogen levels are usual in women during and after untreated menopause, resulting in various changes in the skin, hair, and nails, that reflect deeper issues, down to bone health, heart health, brain health, and more. Since we can’t see our bones or hearts or brains without scans (or a serious accident/incident), we’re going to focus on the outward signs of estrogen deficiency.
Estrogen helps maintain healthy collagen production, skin elasticity, wound healing, and moisture retention, making it essential for youthful and resilient skin. Declining estrogen levels with menopause lead to a thinner epidermis, decreased collagen production, and more pronounced wrinkles. Skin elasticity also diminishes, which slows the skin’s ability to recover from stretching or deformation. Wound healing also becomes slower, increasing the risk of infections and extended recovery periods after injuries or surgeries—bearing in mind that collagen is needed in everything from our skin to our internal connective tissue (fascia) and joints and bones. So all those things are going to struggle to recover from injury (and surgery is also an injury) without it.
Other visible changes associated with declining estrogen include significant dryness as a result of reduced hyaluronic acid and glycosaminoglycan production, which are essential for moisture retention. The skin becomes more prone to irritation and increased water loss. Additionally, estrogen deficiency results in less resistance to oxidative stress, making the skin more susceptible to damage from environmental factors such as UV radiation and pollution, as well as any from-the-inside pollution that some may have depending on diet and lifestyle.
Acne and enlarged pores are associated with increased testosterone, but testosterone and estrogen are antagonistic in most ways, and in this case a decrease in estrogen will do the same, due increased unopposed androgen signaling affecting the oil glands. The loss of supportive collagen also causes the skin around pores to lose structure, making them appear larger. The reduction in skin hydration further exacerbates the visibility of pores and can contribute to the development of blackheads due to abnormal cell turnover.
Blood vessel issues tend to arise as estrogen levels drop, leading to a reduction in angiogenesis, i.e. the formation and integrity of blood vessels. This results in more fragile and leaky blood vessels, making the skin more prone to bruising, especially on areas frequently exposed to the sun, such as the backs of the hands. This weakened vasculature also further contributes to the slower wound healing that we talked about, due to less efficient delivery of growth factors.
Hair and nail changes often accompany estrogen deficiency. Women may notice hair thinning, increased breakage, and a greater likelihood of androgenic alopecia. The texture of the hair can change, becoming more brittle. Similarly, nails can develop ridges, split more easily, and become more fragile due to reduced collagen and keratin production, which also affects the skin around the nails.
As for what to do about it? Management options for estrogen-deficient skin include:
- Bioidentical hormone replacement therapy (HRT), which can improve skin elasticity, boost collagen production, and reduce dryness and fragility, as well as addressing the many more serious internal things that are caused by the same deficiency as these outward signs.
- Low-dose topical estrogen cream, which can help alleviate skin dryness and increase skin strength, won’t give the systemic benefits (incl. to bones, heart, brain, etc) that only systemic HRT can yield.
- Plant-based phytoestrogens, which are not well-evidenced, but may be better than nothing if nothing is your only other option. However, if you are taking anything other form of estrogen, don’t use phytoestrogens as well, or they will compete for estrogen receptors, and do the job not nearly so well while impeding the bioidentical estrogen from doing its much better job.
And for all at any age, sunscreen continues to be one of the best things to put on one’s skin for general skin health, and this is even more true if running low on estrogen.
For more on all of this, enjoy:
Click Here If The Embedded Video Doesn’t Load Automatically!
Want to learn more?
You might also like:
These Signs Often Mean These Nutrient Deficiencies (Do You Have Any?)
Take care!
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Sweet Spot for Brain Health – by Dr. Sui Wong
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At 10almonds we often mention that “what’s good for the heart is good for the brain”, but at least in part, it’s because (as this book makes very clear), “what’s good for the blood is good for the brain”. After all, our brain uses about 25% of our energy, and that energy is delivered there by the blood. And if it doesn’t get enough nutrients, oxygen, etc, and detritus isn’t taken away, then problems happen.
Dr. Wong discusses Alzheimer’s as heavily driven by metabolic problems such as diabetes and even pre-diabetes, and sets out to put in our hands the guidebook to not only not doing that, but also, actually making sure our brain gets proper nourishment without delivering that as intermittent sugar spikes because we opted for a something with very fast-acting carbs to perk us up energetically.
More than most books on the topic, she talks a lot about the neurobiology of glucose metabolism, so that’s something that really sets this book apart from many of its genre.
The style is narrative, explaining the body’s processes in a clear fashion, without skimping on science. There are definitely words that your average layperson might not know, but they’re explained as we go, and there are frequent recaps of what we learned previously, making for ultimately easy reading.
After all the information is given, there’s also a guided “12-week challenge” with a theme-of-the-week for each week, to integrate a new lifestyle adjustment each week in a progressive fashion so that without needing to drastically change many things at once, we get where we need to be in terms of healthy habits.
Bottom line: if you’d like to do right by your brain and while you’re at it say goodbye to blood sugar highs and lows, then this book is an excellent guide for that.
Click here to check out Sweet Spot For Brain Health, and enjoy a consistently-energized brain!
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Blueberry & Banana Collagen Baked Oats
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Good news for vegans/vegetarians! While we include an optional tablespoon of collagen powder in this recipe, the whole recipe is already geared around collagen synthesis, so it’s very collagen-boosting even with just the plants, providing collagen’s building blocks of protein, zinc, and vitamins C and D (your miraculous body will use these to assemble the collagen inside you).
You will need
- 2 cups oats, whence the protein and zinc
- 1 cup milk (your preference what kind; we recommend almond for flavor; whether you choose plant or animal though, it should be fortified with vitamin D)
- 2 bananas, peeled and mashed
- 4 oz blueberries, whence the vitamin C (frozen is fine) (chopped dried apricots are also a fine substitute if that’s more convenient)
- 1 oz flaked almonds, whence the protein and zinc
- 1 tbsp pumpkin seeds, whence the protein and zinc
- 1 tbsp flax seeds, whence the protein and zinc
- Optional: 1 tbsp maple syrup
- Optional: 1 tbsp collagen powder, dissolved in 1 oz hot water
Method
(we suggest you read everything at least once before doing anything)
1) Preheat the oven to 350℉ / 180℃.
2) Mix the oats with 2 cups boiling water; allow to stand for 10–15 minutes, and then drain any excess water.
3) Mix the mashed bananas with the remaining ingredients except the milk and blueberries, stirring thoroughly.
4) Add the softened oats, and stir those in thoroughly too.
5) Add the milk and blueberries, in that order, stirring gently if using fresh blueberries, lest they get crushed.
6) Pour the mixture into an 8″ square cake tin that you have lined with baking paper, and smooth the top.
7) Bake for about 40 minutes or until firm and golden brown. Allow to cool; it will firm up more while it does.
8) Cut into squares or bars, and serve or store for later.
Enjoy!
Want to learn more?
For those interested in some of the science of what we have going on today:
We Are Such Stuff As Fish Are Made Of ← our main feature about collagen
Take care!
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What I Wish People Knew About Dementia – by Dr. Wendy Mitchell
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We hear a lot from doctors who work with dementia patients; sometimes we hear from carers too. In this case, the author spent 20 years working for the NHS, before being diagnosed with young-onset dementia, at the age of 58. Like many health industry workers who got a life-changing diagnosis, she quickly found it wasn’t fun being on the other side of things, and vowed to spend her time researching, and raising awareness about, dementia.
Many people assume that once a person has dementia, they’re basically “gone before they’re gone”, which can rapidly become a self-fulfilling prophecy as that person finds themself isolated and—though this word isn’t usually used—objectified. Talked over, viewed (and treated) more as a problem than a person. Cared for hopefully, but again, often more as a patient than a person. If doctors struggle to find the time for the human side of things with most patients most of the time, this is only accentuated when someone needs more time and patience than average.
Instead, Dr. Mitchell—an honorary doctorate, by the way, awarded for her research—writes about what it’s actually like to be a human with dementia. Everything from her senses, how she eats, the experience of eating in care homes, the process of boiling an egg… To relationships, how care changes them, to the challenges of living alone. And communication, confusion, criticism, the language used by professionals, or how things are misrepresented in popular media. She also talks about the shifting sense of self, and brings it all together with gritty optimism.
The style is deeply personal, yet lucid and clear. While dementia is most strongly associated with memory loss and communication problems, this hasn’t affected her ability to write well (7 years into her diagnosis, in case you were wondering).
Bottom line: if you’d like to read a first-person view of dementia, then this is an excellent opportunity to understand it from the view of, as the subtitle goes, someone who knows.
Click here to check out What I Wish People Knew About Dementia, and then know those things!
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Castor Oil: All-Purpose Life-Changer, Or Snake Oil?
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As “trending” health products go, castor oil is enjoying a lot of popularity presently, lauded as a life-changing miracle-worker, and social media is abuzz with advice to put it everywhere from your eyes to your vagina.
But:
- what things does science actually say it’s good for,
- what things lack evidence, and
- what things go into the category of “wow definitely do not do that”?
We don’t have the space to go into all of its proposed uses (there are simply far too many), but we’ll examine some common ones:
To heal/improve the skin barrier
Like most oils, it’s functional as a moisturizer. In particular, its high (90%!) ricinoleic fatty acid content does indeed make it good at that, and furthermore, has properties that can help reduce skin inflammation and promote wound healing:
Bioactive polymeric formulations for wound healing ← there isn’t a conveniently quotable summary we can just grab here, but you can see the data and results, from which we can conclude:
- formulations with ricinoleic acid (such as with castor oil) performed very well for topical anti-inflammatory purposes
- they avoided the unwanted side effects associated with some other contenders
- they consistently beat other preparations in the category of wound-healing
To support hair growth and scalp health
There is no evidence that it helps. We’d love to provide a citation for this, but it’s simply not there. There’s also no evidence that it doesn’t help. For whatever reason, despite its popularity, peer-reviewed science has simply not been done for this, or if it has, it wasn’t anywhere publicly accessible.
It’s possible that if a person is suffering hair loss specifically as a result of prostaglandin D2 levels, that ricinoleic acid will inhibit the PGD2, reversing the hair loss, but even this is hypothetical so far, as the science is currently only at the step before that:
However, due to some interesting chemistry, the combination of castor oil and warm water can result in acute (and irreversible) hair felting, in other words, the strands of hair suddenly glue together to become one mass which then has to be cut off:
“Castor Oil” – The Culprit of Acute Hair Felting
👆 this is a case study, which is generally considered a low standard of evidence (compared to high-quality Randomized Controlled Trials as the highest standard of evidence), but let’s just say, this writer (hi, it’s me) isn’t risking her butt-length hair on the off-chance, and doesn’t advise you to, either. There are other hair-oils out there; argan oil is great, coconut oil is totally fine too.
As a laxative
This time, there’s a lot of evidence, and it’s even approved for this purpose by the FDA, but it can be a bit too good, insofar as taking too much can result in diarrhea and uncomfortable cramping (the cramps are a feature not a bug; the mechanism of action is stimulatory, i.e. it gets the intestines squeezing, but again, it can result in doing that too much for comfort):
Castor Oil: FDA-Approved Indications
To soothe dry eyes
While putting oil in your eyes may seem dubious, this is another one where it actually works:
❝Castor oil is deemed safe and tolerable, with strong anti-microbial, anti-inflammatory, anti-nociceptive, analgesic, antioxidant, wound healing and vasoconstrictive properties.
These can supplement deficient physiological tear film lipids, enabling enhanced lipid spreading characteristics and reducing aqueous tear evaporation.
Studies reveal that castor oil applied topically to the ocular surface has a prolonged residence time, facilitating increased tear film lipid layer thickness, stability, improved ocular surface staining and symptoms.❞
Source: Therapeutic potential of castor oil in managing blepharitis, meibomian gland dysfunction and dry eye
Against candidiasis (thrush)
We couldn’t find science for (or against) castor oil’s use against vaginal candidiasis, but here’s a study that investigated its use against oral candidiasis:
…in which castor oil was the only preparation that didn’t work against the yeast.
Summary
We left a lot unsaid today (so many proposed uses, it feels like a shame to skip them), but in few words: it’s good for skin (including wound healing) and eyes; but we’d give it a miss for hair, candidiasis, and digestive disorders.
Want to try some?
We don’t sell it, but here for your convenience is an example product on Amazon 😎
Take care!
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