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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The Obesity Code – by Dr. Jason Fung
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Firstly, if you have already read Dr. Fung’s other book, The Diabetes Code, which we reviewed a little while ago, you can probably skip this one. It has mostly the same information, presented with a different focus.
While The Diabetes Code assumes you are diabetic, or prediabetic, or concerned about avoiding/reversing those conditions, The Obesity Code assumes you are obese, or heading in that direction, or otherwise are concerned about avoiding/reversing obesity.
What it’s not, though, is a weight loss book. Will it help if you want to lose weight? Yes, absolutely. But there is no talk here of weight loss goals, nor any motivational coaching, nor week-by-week plans, etc.
Instead, it’s more an informative textbook. With exactly the sort of philosophy we like here at 10almonds: putting information into people’s hands, so everyone can make the best decisions for themselves, rather than blindly following someone else’s program.
Dr. Fung explains why various dieting approaches don’t work, and how we can work around such things as our genetics, as well as most external factors except for poverty. He also talks us through how to change our body’s insulin response, and get our body working more like a lean machine and less like a larder for hard times.
Bottom line: this is a no-frills explanation of why your body does what it does when it comes to fat storage, and how to make it behave differently about that.
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Stick with It – by Dr. Sean Young
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Most of us know the theory when it comes to building new habits and/or replacing old ones, and maybe we even implement those ideas. So why is our success rate still not as high as we think it should be?
Dr. Sean Young is here to do science to it!
This book comes with advice and explanations that rely a lot less on “that sounds reasonable” and a lot more on “in this recent high-quality study, researchers found…”
And, at 10almonds, we love that. We’re all for trying new things that sound reasonable in general… but we definitely prefer when there’s a stack of solid science to point to, and that’s the kind of thing we recommend!
Dr. Young is big on using that science to find ways to trick our brains and get them working the way we want.
Each chapter has lots of science, lots of explanations, and lots of actionable step-by-step advice.
Bottom line: if you’re all over “Atomic Habits”, this one’s the science-based heavy-artillery for your practical neurohacking.
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How To Out-Cheat “Cheat Days”
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Out-Cheating “Cheat Days” (Or Even Just “Cheat Meals”)
If you are in the habit of eating healthily, the idea of a “cheat day” probably isn’t appealing—because you simply don’t crave junk food; it’s not what your gut is used to.
Nevertheless, sometimes cheat days, or at least cheat meals, choose us rather than the other way around. If your social group is having a pizza night or meeting up at the burger bar, probably you’re going to be having a meal that’s not ideal.
So, what to do about it?
Well, first of all, relax. If it really is an exception and not a regular occurrence, it’s not going to have a big health impact. Assuming that your basic dietary requirements are taken care of (e.g. free from allergens as necessary, vegan/vegetarian if that’s appropriate for you, adhering to any religious restrictions that are important to you, etc), then you’re going to have a good time, which is what scientists call a “pro-social activity” and is not a terrible thing.
See also: Is Fast Food Really All That Bad? ← answer: yes it is, but the harm is cumulative and won’t all happen the instant you take a bite of a chicken nugget
Think positive
No, not in the “think positive thoughts” sense (though feel free, if that’s your thing), but rather: focus on adding things rather than subtracting things.
It’s said:
❝It’s not the calories in your food that make the biggest impact on your health; it’s the food in your calories❞e
…and that’s generally true. The same goes for “bad things” in the food, e.g. added sugar, salt, seed oils, etc. They really are bad! But, in this case you’re going to be eating them and they’re going to be nearly impossible to avoid in the social scenarios we described. So, forget that sunk treasure, and instead, add nutrients.
10almonds tip: added nutrients remain added nutrients, even if the sources were not glowing with health-appeal and/or you ate them alongside something unhealthy:
- Those breaded garlic mushrooms are still full of magnesium and fiber and ergothioneine.
- The chili-and-mint peas that came as an overpriced optional side-dish with your burger are still full of protein, fiber, and a stack of polyphenols.
…and so on. And, the more time you spend eating those things, the less time you spend eating the real empty-calorie foods.
Fix the flaw
We set out to offer this guide without arguing for abstemiousness or making healthy substitutions, because we assume you knew already that you can not eat things, and as for substitutions, often they are not practical, especially if dining out or ordering in.
Also, sometimes even when home-cooking something unhealthy, taking the bad ingredient out takes some of the joy out with it.
Writers example: I once incorrectly tried to solve the fat conundrum of my favorite shchi (recipe here) by trying purely steaming the vegetables instead of my usual frying/sautéing them, and let’s just say, that errant-and-swiftly-abandoned version got recorded in my nutrition-tracker app as “sad shchi”.
So instead, fix the flaw by countering it if possible:
- The meal is devoid of fiber? Preload with some dried figs (you can never have too many dried figs in your pantry)
- The meal is high in saturated fat? Enjoy fiber before/during/after, per what’s convenient for you. Fiber helps clear out excess cholesterol, which is usually the main issue with saturated fat.
- The meal is salty? Double down on your hydration before, during, and after. If that sounds like a chore, then remember, it’s more fun than getting bloated (which results, counterintuitively, from dehydration—because your body detects the salt, and panics and tries to retain as much water as possible to restore homeostasis, resulting in bloating) and hypertensive (which results from the combination of the blood having too much salt and too little water, and cells retaining too much water and pressing inwards because it is the cells themselves that are bloated). So, tending to your hydration can help mitigate all of the above.
- The meal is full of high-GI carbs? Preload with fiber, enjoy the carbs together with fats, and have something acidic (e.g. some kind of vinegar, or citrus fruit) with it if that’s a reasonable option. Yes, this does mean that a Whiskey Sour is better for your blood sugars than an Old Fashioned, by the way, and/but no, it doesn’t make either of them healthy.
- The meal is inflammatory? Doing all of the above things will help, as will eating it slowly/mindfully, which latter makes it less of a shock to your system.
See also: How To Get More Nutrition From The Same Food
Enjoy!
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This salt alternative could help reduce blood pressure. So why are so few people using it?
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One in three Australian adults has high blood pressure (hypertension). Excess salt (sodium) increases the risk of high blood pressure so everyone with hypertension is advised to reduce salt in their diet.
But despite decades of strong recommendations we have failed to get Australians to cut their intake. It’s hard for people to change the way they cook, season their food differently, pick low-salt foods off the supermarket shelves and accept a less salty taste.
Now there is a simple and effective solution: potassium-enriched salt. It can be used just like regular salt and most people don’t notice any important difference in taste.
Switching to potassium-enriched salt is feasible in a way that cutting salt intake is not. Our new research concludes clinical guidelines for hypertension should give patients clear recommendations to switch.
What is potassium-enriched salt?
Potassium-enriched salts replace some of the sodium chloride that makes up regular salt with potassium chloride. They’re also called low-sodium salt, potassium salt, heart salt, mineral salt, or sodium-reduced salt.
Potassium chloride looks the same as sodium chloride and tastes very similar.
Potassium-enriched salt works to lower blood pressure not only because it reduces sodium intake but also because it increases potassium intake. Insufficient potassium, which mostly comes from fruit and vegetables, is another big cause of high blood pressure.
What is the evidence?
We have strong evidence from a randomised trial of 20,995 people that switching to potassium-enriched salt lowers blood pressure and reduces the risks of stroke, heart attacks and early death. The participants had a history of stroke or were 60 years of age or older and had high blood pressure.
An overview of 21 other studies suggests much of the world’s population could benefit from potassium-enriched salt.
The World Health Organisation’s 2023 global report on hypertension highlighted potassium-enriched salt as an “affordable strategy” to reduce blood pressure and prevent cardiovascular events such as strokes.
What should clinical guidelines say?
We teamed up with researchers from the United States, Australia, Japan, South Africa and India to review 32 clinical guidelines for managing high blood pressure across the world. Our findings are published today in the American Heart Association’s journal, Hypertension.
We found current guidelines don’t give clear and consistent advice on using potassium-enriched salt.
While many guidelines recommend increasing dietary potassium intake, and all refer to reducing sodium intake, only two guidelines – the Chinese and European – recommend using potassium-enriched salt.
To help guidelines reflect the latest evidence, we suggested specific wording which could be adopted in Australia and around the world:
Recommended wording for guidance about the use of potassium-enriched salt in clinical management guidelines. Why do so few people use it?
Most people are unaware of how much salt they eat or the health issues it can cause. Few people know a simple switch to potassium-enriched salt can help lower blood pressure and reduce the risk of a stroke and heart disease.
Limited availability is another challenge. Several Australian retailers stock potassium-enriched salt but there is usually only one brand available, and it is often on the bottom shelf or in a special food aisle.
Potassium-enriched salts also cost more than regular salt, though it’s still low cost compared to most other foods, and not as expensive as many fancy salts now available.
It looks and tastes like normal salt.
Jimmy Dean/UnsplashA 2021 review found potassium-enriched salts were marketed in only 47 countries and those were mostly high-income countries. Prices ranged from the same as regular salt to almost 15 times greater.
Even though generally more expensive, potassium-enriched salt has the potential to be highly cost effective for disease prevention.
Preventing harm
A frequently raised concern about using potassium-enriched salt is the risk of high blood potassium levels (hyperkalemia) in the approximately 2% of the population with serious kidney disease.
People with serious kidney disease are already advised to avoid regular salt and to avoid foods high in potassium.
No harm from potassium-enriched salt has been recorded in any trial done to date, but all studies were done in a clinical setting with specific guidance for people with kidney disease.
Our current priority is to get people being managed for hypertension to use potassium-enriched salt because health-care providers can advise against its use in people at risk of hyperkalemia.
In some countries, potassium-enriched salt is recommended to the entire community because the potential benefits are so large. A modelling study showed almost half a million strokes and heart attacks would be averted every year in China if the population switched to potassium-enriched salt.
What will happen next?
In 2022, the health minister launched the National Hypertension Taskforce, which aims to improve blood pressure control rates from 32% to 70% by 2030 in Australia.
Potassium-enriched salt can play a key role in achieving this. We are working with the taskforce to update Australian hypertension management guidelines, and to promote the new guidelines to health professionals.
In parallel, we need potassium-enriched salt to be more accessible. We are engaging stakeholders to increase the availability of these products nationwide.
The world has already changed its salt supply once: from regular salt to iodised salt. Iodisation efforts began in the 1920s and took the best part of 100 years to achieve traction. Salt iodisation is a key public health achievement of the last century preventing goitre (a condition where your thyroid gland grows larger) and enhancing educational outcomes for millions of the poorest children in the world, as iodine is essential for normal growth and brain development.
The next switch to iodised and potassium-enriched salt offers at least the same potential for global health gains. But we need to make it happen in a fraction of the time.
Xiaoyue Xu (Luna), Scientia Lecturer, UNSW Sydney; Alta Schutte, SHARP Professor of Cardiovascular Medicine, UNSW Sydney, and Bruce Neal, Executive Director, George Institute Australia, George Institute for Global Health
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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Measles cases are rising—here’s how to protect your family
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The U.S. is currently experiencing a spike in measles cases across several states. Measles a highly contagious and potentially life-threatening disease caused by a virus. The measles-mumps-rubella (MMR) vaccine prevents measles; unvaccinated people put themselves and everyone around them at risk, including babies who are too young to receive the vaccine.
Read on to learn more about measles: what it is, how to stay protected, and what to do if a measles outbreak happens near you.
What are the symptoms of measles?
Measles symptoms typically begin 10 to 14 days after exposure. The disease starts with a fever followed by a cough, runny nose, and red eyes and then produces a rash of tiny red spots on the face and body. Measles can affect anyone, but is most serious for children under 5, immunocompromised people, and pregnant people, who may give birth prematurely or whose babies may have low birth weight as a result of a measles infection.
Measles isn’t just a rash—the disease can cause serious health problems and even death. About one in five unvaccinated people in the U.S. who get measles will be hospitalized and could suffer from pneumonia, dehydration, or brain swelling.
If you get measles, it can also damage your immune system, making you more vulnerable to other diseases.
How do you catch measles?
Measles spreads through the air when an infected person coughs or sneezes. It’s so contagious that unvaccinated people have a 90 percent chance of becoming infected if exposed.
An infected person can spread measles to others before they have symptoms.
Why are measles outbreaks happening now?
The pandemic caused many children to miss out on routine vaccinations, including the MMR vaccine. Delayed vaccination schedules coincided with declining confidence in vaccine safety and growing resistance to vaccine requirements.
Skepticism about the safety and effectiveness of COVID-19 vaccines has resulted in some people questioning or opposing the MMR vaccine and other routine immunizations.
How do I protect myself and my family from measles?
Getting an MMR vaccine is the best way to prevent getting sick with measles or spreading it to others. The CDC recommends that children receive the MMR vaccine at 12 to 15 months and again at 4 to 6 years, before starting kindergarten.
One dose of the MMR vaccine provides 93 percent protection and two doses provide 97 percent protection against all strains of measles. Because some children are too young to be immunized, it’s important that those around them are vaccinated to protect them.
Is the MMR vaccine safe?
The MMR vaccine has been rigorously tested and monitored over 50 years and determined to be safe. Adverse reactions to the vaccine are extremely rare.
Receiving the MMR vaccine is much safer than contracting measles.
What do I do if there’s a measles outbreak in my community?
Anyone who is not fully vaccinated for measles should be immunized with a measles vaccine as soon as possible. Measles vaccines given within 72 hours after exposure may prevent or reduce the severity of disease.
Children as young as 6 months old can receive the MMR vaccine if they are at risk during an outbreak. If your child isn’t fully vaccinated with two doses of the MMR vaccine—or three doses, if your child received the first dose before their first birthday—talk to your pediatrician.
Unvaccinated people who have been exposed to the virus should stay home from work, school, day care, and other activities for 21 days to avoid spreading the disease.
For more information, talk to your health care provider.
This article first appeared on Public Good News and is republished here under a Creative Commons license.
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The FDA Just Redefined “Healthy”—But How?
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In the ongoing war of labelling regulations (usually with advertisers on one side and regulators on the other), the FDA has updated what’s required in order to label a food as “healthy”.
Here’s what they’re now* requiring:
To bear the “healthy” claim, a food product needs to:
- Contain a certain amount of food (food group equivalent) from at least one of the food groups or subgroups (such as fruits, vegetables, fat-free and low-fat dairy etc.) recommended by the Dietary Guidelines.
- Adhere to specified limits for the following nutrients: saturated fat, sodium, and added sugars.
Source: FDA | Press Releases | FDA Finalizes Updated “Healthy” Nutrient Content Claim
*however, manufacturers have 3 years to conform, which if we’re being cynical about it, looks suspiciously like just short of a US presidential election cycle so that actual enforcement will be someone else’s problem.
Will it help?
Maybe! It’s not too dissimilar to the “traffic light system” already in use in Europe, although that currently emphasizes the absence/presence of “bad things” e.g. saturated fat, sodium, and added sugars.
It has its faults, because for example…
- not all saturated fat is bad, and a jar of coconut oil is now definitely going to get labelled as very unhealthy
- low-sodium salt is, ironically, going to to get flagged as being very high in sodium and therefore unhealthy
This latter is because on a g/100g basis, a product that’s ⅓ sodium chloride is going to have a lot of sodium, even if it’s approaching ⅔ less sodium than the product it’s (healthily!) replacing.
However, on a large scale, these kinds of problems are surely going to be small next to (hopefully) manufacturers scrambling to find ways to cut down on the saturated fats, sodium, and added sugars.
You may be wondering…
What will they replace them with?
Sometimes, companies trying to make something healthier will mess up, like when the health risks of smoking hit public consciousness, one cigarette company had the bright idea of putting asbestos in their filter tips, to market them as healthier. So, could something similar happen here?
- Saturated fat: definitely could; because the health benefits/risks of different kinds of fats and their constituent fatty acids are a lot more nuanced than just “saturated” vs “mono-/polyunsaturated”, it is definitely possible that companies may replace healthier saturated-heavy fats with less healthy unsaturated fats, depending on what is cheaper.
- See also: Can Saturated Fats Be Healthy?
- Sodium: probably not; likely go-to replacements for sodium chloride will be potassium chloride (healthier than sodium chloride) and MSG (has an unearned bad reputation in the US, but is healthier than sodium chloride).
- Added sugars: probably—things get very complicated very quickly when it comes to artificial sweeteners, and also the crux will definitely lie in what gets defined as an “added sugar”; watch out for a rise in the use of things that slide by the definition of added sugar while still being chemically (and, which is important, metabolically) the same thing.
Well that doesn’t sound great
It doesn’t, but on the flipside, the positive inclusions will probably be mostly good.
For example, the only way to get a “healthy” labelling in including fiber is to include more fiber, same with vitamins and minerals.
The low-fat dairy thing could possibly get abused (much like with the general “low-fat” trend of the 80s).
The “portion of fruit” thing will need to be carefully defined to avoid running straight back into the “this is just added sugar by another name” problem; mostly that it’ll need to still include the same amount of fiber as was in the whole fruit, gram for gram.
See also: What Matters Most For Your Heart? ← it’s about fiber, not salt or saturated fats!
Take care!
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