Recent findings have caused me to seriously question this narrative. One of the first challenges was the finding that genetically wild mice (as opposed to inbred laboratory strains) do not live longer when their calorie intake is restricted, despite showing hormonal changes associated with longevity in other strains, although the restricted animals do develop less cancer (1). One of the biggest blows came in 2009, when researchers published the results of a study that analyzed the effect of calorie restriction on lifespan in 41 different strains of mice, both male and female (2). They found that calorie restriction extends lifespan in a subset of strains, but actually shortens lifespan in an even larger subset. Below is a graph of the effect of calorie restriction on lifespan in the 41 strains. Positive numbers indicate that calorie restriction extended life, while negative numbers indicate that it shortened life:
If we take the results of this study at face value, it suggests that under the conditions of this experiment:
- Calorie restriction is more likely to shorten life than lengthen it in mice.
- The effects of calorie restriction on lifespan depend on an animal's genetic background.
- The calorie restriction literature may suffer from publication bias.
Today, a new study was published that casts further doubt on the idea that calorie restriction extends lifespan in mammals, including primates (4). Researchers from the National Institute on Aging placed macaques on an unrefined (whole food based) diet for 26 years, with or without 30 percent calorie restriction. They did this in two experiments, one starting with young monkeys and one starting with older monkeys. Both experiments showed that calorie restriction does not extend lifespan under these conditions, although it does prevent obesity and cancer, and apparently maintains a youthful appearance.
It's worth mentioning that the control (unrestricted) monkeys in the first experiment were truly given as much food as they wanted to eat (ad libitum), while those in the second experiment were given an amount of food that allowed them to reach a normal weight but not become overweight. Therefore, one could argue that the control group in the second experiment was slightly calorie restricted. They certainly gained less fat than in the previous experiment, but their diet was also far superior.
I think when you consider all the evidence to date, the take-away message is that eating a nutritious diet and staying relatively lean will probably prolong your life, while calorie restriction may or may not. It probably does reduce the risk of specific diseases however. Currently, a number people around the world are restricting their calorie intake in the hope of living longer. I wish these pioneers the best of luck. Hopefully we'll have the answer to this question eventually, but if I were a bettin' man I wouldn't put my money on the idea that calorie restriction will extend lifespan at this point.
Thank you for this timely post.
I have found conflicting information on this topic recently, including confusion regarding which pictures of monkeys correspond to which so that some people claim that CR withers your appearance but prolongs your life or that CR kills you quickly but preserves your looks.
By the way, the CAPTCHA for your comments is hellish. Please change it.
Txomin - sounds like a name you'd give a robot!
I thought the hellish CAPTCHA was just my eyes, or maybe my aging brain.
Great post Stephan.
I always wondered; what if you went out into the wild and, like an omnipotent thief, always took away some of the food in a monkey's foraging range, so it ate less, or exercised more: would it live longer?
It strikes me as somewhat implausible, once you put it like that.
I think the evidence for time-restricted feeding looks better - because you know you're not starving, and you are eating in a way closer to the way your Last Healthy Ancestor ate.
With IF you're doing something your great-grandmother would understand, whereas she definitely would not approve of calorie restriction.
Now, how are the low-carb macaques doing?
I was kind-of-sort-of persuaded by Roy Walford a long time ago on this issue and later became mostly critical.
A long time later (2 or 3 years ago now) I wrote a harsh critique of the longevity "blue zones" book, key critique being over-application (already acting as if it were true) of calorie restriction research.
I had the Okinawan diet mixed up at the time but my suspicions about CR are coming in roughly like I envisioned - probably not widely applicable and much more of a gamble than many presume - like the life extenders from the 90s taking 300 pills and capsules and potions daily - then-current research was leaving tantalizing breadcrumbs and people were just too, too eager to follow the trail.
Hi Stephan, what's your thoughts on IF since it is somewhat related to CR, awesome tool or overhyped?
Many years ago I met a science journalist who told me with great enthusiasm how calorie restriction was extending lifespan in lab animals. This was the secret of a long healthy life, he said. I suggested the animals might have had vitamin and mineral deficiencies which were being corrected by calorie restriction. He seemed rather shocked.
I subsequently did some research on animal diets, and found enormous variation in their micronutrient content. The biggest cattle feed manufacturer in the UK, for instance, had a mineral mix with 20 times more iron than manganese. American cattle feed had equal quantities, and I thought this might explain why the UK had a BSE (mad cow) epidemic and the US didn't. The cause of BSE was supposed to be 'infected' meat and bone meal, but actually this meal is extremely high in minerals which inhibit manganese absorption (Ca, P and Fe). We now know that lab animals deficient in manganese-SOD get spongiform brain disease.
More recently we hear that captive cheetahs are dying of a mad cow-like disease.
Their feed has many times more iron than it should have.
'.. Excessive iron intake may be indicated by this diet evaluation. Hemosiderosis (deposition of iron in tissues) of unknown cause is common in many zoo species, and has been reported in zoo felids including cheetahs (Munson and Worley, 1991). ..'
This post comes at such a convenient time. I was just about to begin to consider Caloric Restriction in some sort of fashion. For now... I'll stick to eating a nutrient dense diet and exercising as I see fit.
I remember reading the article about the CR diet effect on monkeys and being very impressed with the way underfed monkeys looked and feel and getting an idea that starting IF would be worth trying. My guess, normally adult people accept the fact that it is normal not to reach 90 years old, mostly people scared of cancer, want to avoid suffering from age-related deceases and to delay the time when they start to look unattractive(hard to measure) and experience a decline in physical and mental abilities.
I'm with Stylooke. What does this mean for IF? Can we put yet another nail in the Paleolithic Reenactment Movement with this?
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Just as the underlying genetics played a huge part in the various strains of mice they do the same in people.
This discussion based on the Albert Einstein study of centenarians is worth reading.
Lifestyles of the Old and Healthy Defy Expectations
No way of eating will make any of us live forever, though I often detect an undertone of denial in the attitudes of people who are devoted to extreme diets.
It's also interesting for those of us who are older to note that this study, too, seems to confirm the hints from NHANES that being overweight at 70 is far from unhealthy, though obesity is to be avoided.
I would love to know your answer to three questions:
- Doesn't the record lifespan of the Okinawans very strongly suggest that a moderate CR of about 10 percent is best for longevity?
- What's your view on protein/ methionine restriction? I believe the Okinawans ate about 9 percent protein, mostly from low-methionine sweet potatoes.
Maybe the longevity trick is to be well nourished without too many high-protein animal products?
This study also seems to suggest such an approach:
Long-term effects of calorie or protein restriction on serum IGF-1 and IGFBP-3 concentration in humans
- What do you think about intermittent fasting? Any idea about how much or what kind of fasting should be optimal for longevity?
How about combining these approaches with a simple food diet? Should be doable!
Keep up the great work! Your blog is very inspiring!
Jenny, I've also heard that about slightly overweight older people being 'healthier' than lean older people. Is it possible that the reason is because many 'lean' older people aren't that way on *purpose* but actually as a symptom of some pathology (maybe malapsorption or something else)? I wonder if you compare older people who are lean who TRY to be lean via healthy living vs. a slightly overweight older person if the stats would change?
It'd be nice if CR and/or IF would increase lifespan, but even if it doesn't, if it gives people more robust/youthful years, that enough for many to want to embrace it.
Dear GOD, sorry for the repeat posts! I thought I was having problems with the CAPTCHA....
I think you're right regarding leanness with elderly. In my industry, Life Insurance, older folks who are abnormally thin (i.e. underweight) are rated for higher pricing or even declined for insurance. However, older people who are lean but within normal ranges are often those that are offered the lowest cost insurance.
Life insurance companies have been tracking this type of information, and others, for decades. I'd love to look at all their proprietary information regarding mortality. For example, for at least 15 years they've only rated folks for cholesterol if it was above 250ish. I used to wonder why such a high level needed to be reached before charging more for insurance. Obviously, I now know why - their mortality experiences weren't matching up with what the "experts" were recommending.
Stephan, in this paragraph:
"It's worth mentioning that the control (unrestricted) monkeys in the first experiment were truly given as much food as they wanted to eat (ad libitum), while those in the second experiment were given an amount of food that allowed them to reach a normal weight but not become overweight. Therefore, one could argue that the control group in the second experiment was slightly calorie restricted. They certainly gained less fat than in the previous experiment, but their diet was also far superior."
Is "the first experiment" the one with macaques, or the first of the two with rhesus monkeys?
Considering that the National Institutes of Health website already has links to many published studies of the impressive benefits of calorie restriction on humans, I would not get very excited about a couple studies with monkeys.
"how are the low-carb macaques doing?" Good question. I'm not aware that there are LC macaques, but I would love to see what happens! I predict a shortened lifespan.
I think IF could be a useful tool, but I wouldn't expect it to extend life.
Hi Jenny and Jody,
Overweight people seem to die less mostly because they have higher muscle mass. If you control for muscle mass, mortality increases with increasing fat mass on average.
The lifespan of Okinawans suggests that they had some characteristic that made them live a long time, but it's an unproven assumption that the key characteristic was calorie restriction. They were doing a lot of things differently than what we do today, and they are also genetically distinct.
Sorry, I wasn't being consistent with my terminology-- macaques and rhesus monkeys are the same thing for our purposes.
There are no studies showing that CR extends lifespan in humans, so I don't see why the human studies should supersede those in monkeys.
I'm curious, in monkeys and/or humans, what adaptations the body makes to calorie restriction. Assuming that the person or animal reaches a point where energy in matches energy expended, does that arise due to reduced activity, reduced body mass, or?
In other words, would one become a thin, active person or a person with barely enough energy to stay warm and move about?
Stephan, I'm puzzled by your response to me, in which you said: "There are no studies showing that CR extends lifespan in humans, so I don't see why the human studies should supersede those in monkeys."
Your statement seem meaningless, since, as you well know, it would take a long time -- at least one long human lifespan -- to come to any meaningful conclusions about the longevity benefits of CR.
However, there have been many peer-reviewed studies mentioned on the NIH website that document quality-of-life benefits from CR.
Until (and even after) we know whether there is a longevity benefit, I will be satisfied with quality-of-life benefits.
What would IF be a "useful tool" for if it doesn't extend life? Isn't it claimed to have the same or better effects as CR?
This post was about lifespan extension. That's why I disagreed with your contention that the human studies supersede those in monkeys. If we're talking about resistance to obesity and non-infectious disease, particularly metabolic disease, then I think it's likely that CR is effective in humans. The CR lit in animals and humans is consistent with this.
Although I think there's an important caveat here. One could legitimately ask whether the benefit comes from avoiding overeating, or restricting intake beyond what is biologically normal. In the modern US, the average person eats ~20-30% more calories than he/she should based on activity level. Even in the last 30 years, kcal intake has increased by ~20% in the US. This is not biologically normal.
It may just be semantics, but I would guess that avoiding overeating is where most of the benefit lies, and the value of restricting kcal intake beyond that point may be questionable.
It has the potential to improve body composition, metabolic function, and perhaps general stress resistance, but I'd like to see more research on it.
I think this is a great topic to question. I questioned Dr. Rosedale last year about this very issue. Just because worms have great CRON data, does not imply we can generalize this through the mammalian clade. There are a lot of conflicted data about the effect of IGF1 and mTOR on longevity anti aging medicine and in anti aging research. I'm glad to see this question raised again.
Jenny:No way of eating will make any of us live forever
Nobody talks about forever.
Its obvious that way of eating influences how long will you live, those that talk about genetics do not understand that nutrition influences gene expression which means that even if you have 'wrong' genes with specific nutrition you could fix them (although not in the one-diet-for-everybody fashion). So some of those vampire dudes have protective genes, some have protective environment, some happened to have protective nutrition.
I suggest people get into touch with nutrigenetics.
> "how are the low-carb macaques doing?" Good question. I'm not aware that there are LC macaques, but I would love to see what happens! I predict a shortened lifespan.
I'm sure Rupert Sheldrake knows.
Oh, sorry ... "the great Rupert Sheldrake"
Yes agree, according to the research 1930's has confirmed that a dietary lifestyle recognized as caloric restriction can lengthen healthy lifespan in mammals, and signs are that it does the same in humans.
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@ Sanjeev, LOL
If anyone wants to know what CR is actually like, Ben Best's accounts, like this, are illuminating
"There is skepticism that lifespan extension with CRAN in short-lived species can be generalized to long-lived species. Even if CRAN could not extend maximum lifespan in humans, I think that it likely increases average lifespan"
Whether animal CR studies can really be compared with human CRAN or CRON - CR plus supplements and "superfoods" - is a relevant question.
Life Extension in practice:
the shocking truth about calorie restriction
Eating right foods and not starving yourself is the best way to lose weight. Diet plans and programs that allow you to do that and allow you to eat foods you love the most are the best plans and programs you can ever be on.
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I'm not aware that there are LC macaques, but I would love to see what happens! I predict a shortened lifespan.
Although macaques are considered omnivores, they are mainly herbivorous depending in large part on fruits.
A prediction of a short lifespan on a species that evolved on a high carb diet seems like a safe bet.
Thanks for information i am impress with your blog post written style "Does Calorie Restriction Extend Lifespan in Mammals?" . Keep it up.
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Intermittent Fasting (IF) is likely quite different than CR, in that it manipulates the timing of eating rather than overall amount consumed across a 24-hour (or 48h) period. I find IF comes naturally on a relatively lowish carb paleo type diet, confining my eating largely to an 8-10 hour window (roughly 11am or noon to 7 or 8pm, usually two big meals). IF may have other benefits in addition to helping maintain leanness, such as possible anti-cancer effects. I'm guessing if it does, it is due to maintaining a longer window of ketosis which may help with pre-cancer cell apoptosis. It would be interesting to see animal studies of this.
It is good to see an article that questions the popular notion that calorie restriction extends lifespan. For me the content of the diet is far more important than the amount. Simplifying the analysis to focus on only calories is I think not the answer for those wanting to live beyond 100.
I believe there is too much focus on calories in all sorts of areas from obesity to life extension as I discussed in a recent article on my website: http://www.drdobbin.co.uk/calorie-counting-does-it-work
Nevertheless, there is a place for approaches such as IF and calorie counting if other variable are controlled for.
Oh, and yes the CAPTCHA verification is a nightmare.
Is IF that different from CR? When I first read about CR many years ago, it meant restricting calories without restricting micronutrients. Later it turned into food restriction, which meant feeding the animals intermittently instead of ad lib. This amounts to IF, really.
Both CR and IF are supposed to work at least in part by promoting autophagy. I don't see how else you can prolong lifespan: you simply have to clear out the junk if you want to live longer. We now know that exercise induces autophagy too. Eat a big breakfast, walk to work, eat nothing until the evening. We also know that fat breakdown uses the same machinery as autophagy ('lipophagy'), meaning it has the potential to prevent obesity.
It's even thought to be a tumour suppressor.
'.. malignant transformation is frequently associated with suppression of autophagy. ..'
Cancer is only one of many age-related diseases involving failure of autophagy. Scientists are getting very excited about it.
My experience with IF is that it works psychologically for me. I am far more interested in being able to eat to the point of feeling stuffed once per day than of being able to eat several times per day. I practice IF because I really don't want to be overweight, and without some sort of system to control my intake, I would easily and rapidly gain weight. Without IF, I have to meticulously count calories and always feel denied. With IF, I can pretty much eat as much as I want, as long as I am careful to start my daily feat with lots of vegetables and water which fill me up without weighing me down later.
Has anyone here ever read Dr Gundry's Diet Evolution? His theory is that, via a process of group selection, humans have evolved suicide genes which activate when an old person consumes too much of the good food (especially animal protein), because under most conditions this means taking such food out of the mouths of their grandchildren. The ideal food for longevity and health, according to Gundry, is greens, since these are typically plentiful in nature. So an old person who eats mostly greens is not depriving their grandchildren, and might even be useful to them in some way, and so should be kept alive.
Finally, Art DeVany points out that very few studies of obesity and illness measure muscle, which he thinks plays a critical role in periods of stress, such as illness. By his theory, overweight and muscular is far better than lean but non-muscular. Most lean old people are NOT muscular, whereas most fat old people have substantial muscle underneath the blubber, especially if they are still able to walk, since it takes a lot of muscle to move such a huge carcass around. (Lean and muscular is best, of course, according to DeVany.)
CAPTCHA is horrible. There are sites far more popular than yours that simply require entering the sum of 2+6 or something similar, and even use the same two numbers permanently.
Speed of metabolism is at least partially responsive to available calories. Perhaps increases in longevity with cr occur by slowing mitosis and thereby slowing the telomeric timer in each of us. Survival from famine could be a subtle selection mechanism mediated by cr.
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Dr Desmond Morris has written these two good pieces on aging, eating e t c.
Why man could live forever
A little bit of what you fancy
"I was at the 121st birthday party of Madame Jeanne Calment, officially the oldest person who has ever lived.[...]
I was attending her birthday because I wanted to understand how any human being could survive for such a long time. Her answer was that it was due to her calmness.
"That's why they call me Calment," she chuckled, with a twinkle in her now almost sightless eyes. But there was much more to it than that. I discovered from her doctor that, amazingly, she had never had a day's illness in her entire life.
What an immune system she must have had! It had protected her against every virus going. If only medical science could have extracted its essence and injected it into the rest of us.[...]
In these health-conscious days of carefully balanced diets, fitness regimes and workouts, it is worth asking what kind of lifestyle the astonishing Madame Calment had enjoyed for so long. The answer comes as a shock. It turns out that she was a gourmet who liked alcohol, cigarettes, chocolates and sweets.[...]
But if society should change its attitudes to ageing, then so too should individuals. And there are important lessons here that can be learned from people like Madame Calment. The first and most important one is that she had outlived everyone else on the planet by not worrying about her health. Until the doctors got at her, in her final years, I doubt if she ever gave her health a moment's thought.
She ate the rich food she liked, she drank the cheap wine she liked, she smoked the strong cigarettes she liked and - as she said - she kept calm. Had she worried about her health and taken steps to improve it, the anxiety caused by stirring up fears about ill-health would themselves have reduced the efficiency of her immune system. She would have then probably succumbed to the afflictions that plague so many people. Another important point is that she didn't do any extreme exercise, but she did take a lot of the milder type. She was still riding her bicycle at the age of 100.
When I made a study of the lifestyles of people who lived to be 100 and over, I found this applied to most of them. They nearly all had a regular, mild form of body activity that kept them moving. Cycling, walking and gardening were three of the most popular - done not to keep fit but for pleasure. And, like Madame Calment, they almost all retained a wry sense of humour and cheerfulness. Surprisingly, among the very old, Jeanne Calment was not alone in her love of cigarettes.[...]
Eubie Blake, a U.S. jazz pianist, said at his 100th birthday party: "If I'd known I was gonna live this long, I'd have taken better care of myself."
The irony is that it was probably his not worrying about his health that enabled him to live that long.
It seems that if you wish to live an unusually long life, you need to eat and drink what you fancy, keep as mobile as possible, have a lively interest in the world around you, avoid introspection and, above all, do not waste time worrying about your health.
Food faddists, couch potatoes, solemn bores and health fanatics all seem doomed to earlier graves. Studying the over-100s, it seems advisable to avoid intensive health regimes."
Never getting sick indicates a rather lackadaisical immune system, rather than an especially hard-fighting one, wouldn't you say?
But basically, this does jive with studies of centenarians: they're not worriers and they're not health freaks. The book "Blue Zones," which I love to poke fun at, had a chapter describing one of one of these vigorous elderly types, ending up with the usual list of healthy things to do, including eschewing animal fats. What was this health exemplar doing, as described? Walking to the store to pick up his weekly two pints of lard. Oops!
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Sorry about the captcha, as far as I know, I have no control over how it's set up. I can turn it off though. I'll give it a shot and we'll see how spammy it gets. As it is, I manage to have an annoying captcha AND lots of spam.
And then there is Walter Breuning who lived until he was 114 years old.
Eating only two meals a day- breakfast and lunch- for the last 35 years of his life he seemed to have been doing IF sort of "unknowingly".
"You get in the habit of not eating at night, and you realize how good you feel. If you could just tell people not to eat so darn much."
"I think you should push back from the table when you're still hungry," Breuning said.
Were it only that easy.
I think that IF would certainly increase average lifespan (if not maximal, but that's just an educated guess because it sound so awesome). The jury's out on calorie restriction (below physiological norms) because I wonder if the negatives of over-fasting would outweigh the positives. On that note, Dr. Andro has some great posts on IF and the reasons why it is beneficial, complete with scientific links and graphs :)
So basically adequately controlling the AMPK/mTOR balance is necessary for being healthy, and IF is a way to restore the balance to AMPK and its autophagy/repair mechanisms when overeating in western cultures causes excessive mTOR proliferation. As for how much to IF, it seems based on Dr. Andro's recommendations and Martin Berkhan's work that a 16hr fast starting with sleep and ending after a workout, followed by a high-carb, high-protein meal immediately PWO is optimal for both fat loss/cellular health/anabolic growth, all "at the same time" in terms of a daily cycle. So yes, IF is good for you and, I think, everyone should be doing it.
'"I think you should push back from the table when you're still hungry," Breuning said.'
I have been puzzling about this. What does Breuning mean by 'still hungry'? I suspect he didn't mean 'hungry' as many people today would understand it. Hungry for me means something quite different from what it meant to me 30 years ago. Then, hunger was something awful that could never be satisfied, however much I ate. I never experience that now, and I believe it to be abnormal and caused by micronutrient deficiencies. I eat until I'm full, but I could conceivably eat more if I tried. Is this what Breuning meant?
Right now I am in the Oxford university science library, feeling really good and buzzing with energy and enthusiasm. I will feel like this all day, despite having nothing to eat for 11 hours. Or perhaps because of it.
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My Mother used say - more than 30 years ago - "If you want pudding, you need to leave a little room".
When I was satisfied by main courses, I Did Have a little room.
One does not Have to eat dessert, it is optional - one has had sufficient.
One is only peckish for "moreish" food, as Nigel Kinbrun might say.
Peckish equals "I'd like an oral treat" - it is not Hunger.
Our culture has let "Greed is Good" attitude permeate the Eating as well as the Financial spheres.
May I ask you an impolite question please? Do you like 'oral treats'? Do you get peckish for them? Are they moreish?
I'm asking because I do remember these things, dimly. A few years ago I had something to celebrate and went off to a high-class supermarket to get a treat. I though I'd been denying myself, and now at last I could indulge. I wandered around for a long time looking at the mouth-watering stuff and my mouth didn't water. I went home empty handed and astonished. Eventually I realised I'd had a food addiction and it was over.
Dale, I think it was the massive amounts of chocolate Madame Calment enjoyed : ) One could of course argue that if chocolate was really that beneficial, 99.9% of human womanhood would become centenarians but I’m with Desmond Morris on this one. It’s the tiny (or more likely huge) black cloud of worry floating in the blue sky of our eating pleasure that can make even chocolate unhealthy.
Some other observations on centenarians made by Dr Morris:
“A second advantage – if you wish one day to celebrate with 100 candles on your birthday cake – is to have had long-lived parents and grandparents. If you are lucky enough to come from a long line of octogenarians or better, you will stand a much better chance of living to a ripe old age yourself – and this applies to both men and women. If your family history shows poor health records, with frequent early deaths, then you are much less likely to enjoy a long life. This is because, genetically, some family trees are more resistant than others to such weaknesses as cancer, diabetes or heart failure. This is where genetic engineering is hoping to make progress in the years ahead, with the aim of removing the genes that are linked to these weaknesses.”
“Other qualities that appeared time and again among the centenarians were: a degree of self-discipline – a tendency to organise their lives and to impose a pattern on their daily routines; moderation in eating – most of them avoided over-eating and under-eating and fad diets were nowhere to be found; moderation in drinking – many of them enjoyed alcohol, but only in small, regular amounts; a focus on things outside themselves – without too much introspection or self-examination; and finally, and most importantly, a calm, even-tempered nature.”
Jane, Breuning ate lots of carbs as I understand it, fruits and grains (waffles and pancakes). Maybe the meal skipping helped but could it simply be self-discipline developed by Breuning over the years, reinforced by his feelings of well-being from his eating habits? He might have been able to handle his hunger better than many others can. I agree with you that nutrient deficiencies probably can cause abnormal hunger. But Breuning didn’t seem to be macro-/micromanaging his diet nutrient wise at all.
Yes I looked him up and found his breakfast was often toast or pancakes, meaning white flour, I suppose. Perhaps if you do intermittent fasting you can get away with some junk. I don't think I could though. Perhaps Breuning's genes and early nutrition set his vitamin and mineral requirements lower than mine.
On IF, doesn't the fact that wild mice (who are practicing IF) live far longer than lab mice suggest that, in fact IF would increase our life-spans. After all, we are far more like the lab mice in both our exercise and diet than we are to the wild mice. So why would you 'not expect' this result translated to humans?
When it comes to the oldest people I have to admit I have a dodgy habit of following their progress on their wiki entry: http://en.wikipedia.org/wiki/Oldest_people.
The current oldest man puts his longevity down to small portions. The oldest woman owes her longevity to avoiding junk food and minding her own bisiness!
Over the next few decades (global catastrophe aside) I'm confident we'll see more supercentenarian. The reason will be the much larger population coming through at the advanced ages. Most of this will be due to population growth in the 20th century, something which was mostly due to increased wealth (easy access to food) and vaccination programmes. However the long term future of this oldest persons website is not so rosy in my view due to obesity and environmental strains. I looked at some of these issues in an article on life expectancy on my own website after a Government agency was stupid enough to predict that 1/3rd of all girls born today will reach 100. Not my view as you can see here: http://www.drdobbin.co.uk/life-expectancy-in-the-uk
it would be nice to compare the "calorie restriction" intended as generic number of calories in a day and comparing it to the effects of fasting or intermittent fasting.
in my opinion the two have completely different means, it's worth to get deeper into the matter.... eating less alone can't have the benefits that fasting have in terms of lifespan extent.
I have done research on this for years in terms of researching and using myself. Roy Walford was right I believe, but did not take the importance of fat into consideration.
Diet that is CR cannot be mostly grain/veg based. They turned into walking skeletons. Yes fat is at a higher set point of calories, but that is where the nutrients are. One has to apply the research from weston a price into this aspect.
Combining the 2 worlds of Walford/weston is the best way to go and intermediate fasting. One cannot respond well to a low fat CR diet, that is just death waiting to happen.
High Fat diet with intermediate fasting I found the best way to go. Ever heard of the warrior diet? That is somewhat a mix on this. One can mix this anyway they want. I would suggest reading up on fasting and westonaprice.org ...U will not go wrong :)))
The study that the core of this blog post is stated upon seemed to be horribly underpowered -- essentially 5 mice per group! Might as well collect data from a magic 8 ball.
Overall - share your thoughts on CR though - I don't believe it will do much for humans, other than what a healthy AL diet would do.
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