Tuesday, February 21, 2017

C is for Carnivore

In a guest post I wrote for Break Nutrition today I showed that the RDA for vitamin C is grossly inflated, particularly on a ketogenic diet. The amount of vitamin C that prevents scurvy, even in carb-eaters, is at most a mere 10 mg a day, and there is little support for taking extra, unless your system is overloaded with glucose.

It is known, but not widely acknowledged that fresh meat cures scurvy.

This was discovered over a hundred years ago. I recently happened upon an issue of the Lancet from August, 1882, in which there was much debate: not about whether fresh meat cures scurvy, that was known, but rather about why fresh meat cures scurvy, but hung or dried meat does not. A few authors referred to previous work, and were I able to pursue the Writing Life more fully, I might take it upon myself to chronicle this discovery. For today I have just excerpted some of my favourite quotes which you can find below.

Something I want to point out about these early conversations is that no one is specifying that they were using organ meats in particular, and there is no reason to believe they were. While it's true that liver, for example, is very high in vitamin C, the fact is that there is enough in plain old skeletal muscle meat to do the trick.

The USDA database is willfully wrong

If you go to the standard reference, the USDA database (or its proxy on self.com), it lists most meat flesh as containing no vitamin C at all. This is nonsensical. Not only does it contradict reports such as from the Lancet, but anywhere there is collagen, there is bound to be some vitamin C. I used to assume this was rounding error, and that the amounts were negligible, but that's not true.

On further searching, I discovered that the practice of the USDA labs with respect to muscle meat of mammals is to fill in vitamin C as assumed to be zero! You can this documented in the USDA Nutrient Data Set for Retail Beef Cuts. Every micronutrient was measured directly, with the exception of vitamin C. It's egregious. They don't do this with fish or shellfish, or even organ meats, but I verified they do it with beef and pork, and presumably that's the practice with all the other meats listed at 0.0mg vitamin C.

I was only able to find one old report that lists some measurements of vitamin Cin various tissues of a few animals including some livestock.

From Die Ascorbinsäure in der Pflanzenzelle. Vitamin C in the Animal Cell By Helmut Metzner, Geoffrey H. Bourne Springer-Verlag, Mar 8, 2013

https://4.bp.blogspot.com/-b8maK84yU-M/WGAqqJymCEI/AAAAAAAAAKc/KZrU1wHZ9AkivUW992a5646xZB2CjOdhQCLcB/s400/vitamin_c_in_tissue.png

As you can see, the worst case scenario comes from a measurement of ox, which had 1.6mg/100g. It seems to me that the real value for beef is likely to be more, especially considering that sheep was reported here at nearly twice that. But even if we take that pessimistic value, it's clear that we can still get our antiscorbutic dose from 625g (less than 1.5 lbs) of beef.

The bottom line is that even on a diet of just muscle meat, you should expect to get enough vitamin C.

The vitamin C present in meat, along with the vitamin C sparing effect of low carb diets is enough to prevent scurvy, even without going out of your way to eat liver or other organs. Save those for pleasure!

Edited to Add: In conversation about this post, Esmée La Fleur pointed out to me that American beef is typically hung, but we are not seeing scurvy in the modern Zero Carb / Carnivore community (with the exception of two cases I've heard of where the people were eating exclusively pemmican for long periods). That includes Stefánsson. Michael Goldstein pointed out that Stefánsson's writings indicate that Inuit ate most meat well done. My hypothesis from these added points is that perhaps hanging and some cooking reduces vitamin C enough that for those still eating glucose, it's not enough to be antiscorbutic, but for carnivores it may be. I'd love to get accurate modern measurements.


Selected notes from the Lancet volume 123

You can find this in Google books [1].

p 329. From a medical report from Mr. W. H. Neale, M.B. B.S. medical officer of the Eira, about an Arctic expedition:

"For the boat journey we saved 40 lb. of tinned meat (per man), and 351b. of tinned soups(per man), 3cwt. of biscuit, and about 800lb. of walrus me it, which was cooked and soldered up by our blacksmith in old provision tins. About 80 lb. of tea were saved, enabling us to have tea night and morning till almost the day we were picked up. No lime-juice was saved. A few bottles of wine and brandy were secured, and kept for Mr. Leigh-Smith and invalids. All the rum was saved, and every man was allowed one-fifth of a gill per day until May 1st, 1882, when it was decided to keep the remaining eighteen gallons for the boats. One man was a teetotaler from January to June, and was quite as healthy as anyone else. Personally it made very little difference whether I took the allowance of "grog" or not. One of the sick men was also a teetotaler nearly all the time. During the boat journey the men preferred their grog when doing any hard work, a fact I could never agree to, but when wet and cold a glass of grog before going to sleep seemed to give warmth to the body and helped to send one to sleep. Whilst sailing, also, one glass of grog would give temporary warmth ; but everyone acknowledged that a mug of hot tea was far better when it was fit weather to make a fire. I do not think that spirits or lime-juice is much use as anti scorbutics ; for if you live on the flesh of the country even, I believe, without vegetables, you will run very little risk of scurvy. There was not a sign of scurvy amongst us, not even an anaemic face. I have brought home a sample of bear and walrus meat in a tin, which I intend to have analysed if it is still in good preservation ; and then it will be a question as to how it will be best to preserve the meat of the country in such a form as to enable a sufficient supply to be taken on long sledge journeys ; for as long as you have plenty of ventilation and plenty of meat, anyone can live out an Arctic winter without fear of scurvy, even if they lie for days in their beds, as our men were compelled to do in the winter when the weather was too bad to go outside (there being no room inside for more than six or seven to be up at one time)."

p331, John Lucas: "Sir, —A propos the annotation appearing under the above heading in The Lancet of June 24th, pp. 1048-9, I would beg permission to observe that almost every medical man in India will be able to endorse the views of Dr. Moore, to which you refer. Medical officers of native regiments notice almost daily in their hospital practice that—to use your writer's words—"insufficient diet will cause scurvy even if fresh vegetable material forms a part of the diet, though more rapidly if it is withheld." Indeed, so far as my humble experience as a regimental surgeon from observations on the same men goes, I am inclined to think that the meat-eating classes of our Sepoys—to wit, the Mahomedans, especially those from the Punjaub—are comparatively seldom seen with the scorbutic taint ; while, on the contrary, the subjects are, in the main, vegetable feeders who are their non-meat-eating comrades, the Hindus (Parboos from the North- West Provinces and Deccan Mahrattas), especially those whose daily food is barely sufficient either in quality or quantity. A sceptic may refuse to accept this view on the ostensible reason that though the food of the meat-eating classes be such, it may, perchance, contain vegetable ingredients as well as meat. To this I would submit the rejoinder that as a matter of fact, quite apart from all theory and hypothesis, the food of these meat-eating classes does not always contain much, or any, vegetables. In the case of the semi-savage hill tribes of Afghanistan and Baluchistan, their food contains large amounts of meat (mutton), and is altogether devoid of vegetables. The singular immunity from scurvy of these races has struck me as a remarkable physiological circumstance, which should make us pause before accepting the vegetable doctrine in relation to scurvy et hoc genus omne."

p370 Charles Henry Ralphe "To the Editor of The Lancet. Sir, —I was struck by two independent observations which occurred in your columns last week with regard to the etiology of scurvy, both tending to controvert the generally received opinion that the exclusive cause of the disease is the prolonged and complete withdrawal of succulent vegetables from the dietary of those affected. Thus Mr. Neale, of the Eira Arctic Expedition, says : " I do not think that spirit or limejuice is of much use as an anti scorbutic ; for if you live on the flesh of the country, even, I believe, without vegetables, you will run very little risk of scurvy." Dr. Lucas writes: "In the case of the semi- savage hill tribes of Afghanistan and Beluchistan their food contains a large amount of meat, and is altogether devoid of vegetables. The singular immunity from scurvy of these races has struck me as a remarkable physiological circumstance, which should make us pause before accepting the vegetable doctrine in relation to scurvy." These observations do not stand alone. Arctic voyagers have long pointed out the antiscorbutic properties of fresh meat, and Baron Larrey, with regard to hot climates, arrived at the same conclusion in the Egyptian expedition under Bonaparte, at the end of last century."

p495 "SCURVY. Dr. Buzzard, in a letter which appeared in oar columns last week, considers the fact that the crew of the Eira were supplied with preserved vegetables tells against the supposition advanced by Mr. Neale, that if Arctic voyagers were to feed only on the flesh of the animals supplied by the country they would be able to dispense with lime-juice. The truth is, it is an open question with many as to the relative antiscorbutic properties of preserved vegetables, and whether under the circumstances in which the Eira's crew were placed they would have been sufficient, in the absence of lime-juice and fresh meat, to have preserved the crew from scurvy. A case in point is the outbreak that occurred on board the Adventure, in the surveying voyages of that vessel and the Beagle. The Adventure had been anchored in Port Famine for several months, and although "pickles, cranberries, large quantities of wild celery, preserved meats and soups, had been abundantly supplied," still great difficulty had been experienced in obtaining fresh meat, and they were dependent on an intermittent supply from wild-fowl and a few shell-fish. Scurvy appeared early in July, fourteen cases, including the assistant-surgeon, being down with it. At the end of July fresh meat was obtained; at first it seemed to prove ineffectual, but an ample supply being continued, the commander was able to report, by the end of August, " the timely supply of guanaco meat had certainly checked the scurvy." This is an instance in which articles of diet having recognised antiscorbutic properties proved insufficient, in the absence of lime-juice and fresh meat, and under conditions of exceptional hardship, exposure, and depressing influence, to prevent the occurrence of scurvy. So with the Eira, we believe that had they not fortunately been able to obtain abundant supplies of fresh meat, scurvy would have appeared, and that the preserved vegetables in the absence of lime-juice would have proved insufficient as antiscorbutics. This antiscorbutic virtue of fresh meat has long been recognised by Arctic explorers, and, strangely, their experience in this respect is quite at variance with ours in Europe. It has been sought to explain the immunity from the disease of the Esquimaux, who live almost exclusively on seal and walrus flesh daring the winter months, by maintaining that the protection is derived from the herbage extracted from the stomach of reindeer they may kill. In view, however, of the small proportion of vegetable matter that would be thus obtained for each member of the tribe, and the intermittent nature of the supply, it can hardly be maintained that the antiscorbutic supplied in this way is sufficient unless there are other conditions tending in the same direction. And of these, one, as we have already stated, consists probably in the fact that the flesh is eaten without lactic acid decomposition having taken place, owing either to its being devoured immediately, or from its becoming frozen. The converse being the case in Europe, where meat is hung some time after rigor mortis has passed off, and lactic acid develops to a considerable extent. This seems a rational explanation, and it reconciles the discrepancy of opinion that exists between European and Arctic observers with regard to meat as an antiscorbutic. In bringing forward the claims of the flesh of recently killed animals as an antiscorbutic, it must be understood that we fully uphold the doctrine that the exclusive cause of scurvy is due to the insufficient supply of fresh vegetable food, and that it can be only completely cured by their administration ; but if the claims advanced with regard to the antiscorbutic qualities of recently slaughtered flesh be proved, then we have ascertained a fact which ought to be of the greatest practical value with regard to the conduct of exploring expeditions, and every effort should be made to obtain it. Everything, moreover, conducive to the improvement of the sailor's dietary ought to receive serious consideration, and it has therefore seemed to us that the remarks of Mr. Neale and Dr. Lucas are especially worthy of attention, whilst we think the suggestion of the former gentleman with regard to the use of the blood of slaughtered animals likely to prove of special value."

p913 "Sir, —In a foot-note to page 49G of his " Manual of Practical Hygiene,", fifth edition, (London, Churchill, 1878), Parkes says : —"For a good deal of evidence up to 1818, I beg to refer to a review I contributed on scurvy in the British and Foreign. Medico-Chirurgical Review in that year. The evidence since this period has added, I believe, little to our knowledge, except to show that the preservation and curative powers of fresh meat in large quantities, and especially raw meat (Kane's Arctic Expedition), will not only prevent, but will cure scurvy. Kane found the raw meat of the walrus a certain cure. For the most recent evidence and much valuable information, see the Report of the Admiralty Committee on the Scurvy which occurred in the Arctic Expedition of 1875-76 (Blue Hook, 1877)." I think that the last sentence in the above is not Parkes' own, but that it must have been added by the editor in order to bring it up to the date of the issue of the current edition. The experience since then of the Arctic Expedition in the Eira coincides with these. I refer to that portion of the report where the author tells us that "our food consisted chiefly of War and walrus meat, mixing some of the bear's blood with the soup when possible." And again: "I do not think that, spirits or lime-juice is much use as an antiscorbutic, for if you live on the flesh of the country, even, I believe, without vegetables, you will run very little risk of scurvy. There was not a sign of scurvy amongst us, not even an anaemic face," (Lancet, Aug. 26th.) So that, as far as this question of fresh meat and raw meat and their prophylactic and curative properties are concerned, ample evidence will be found in other published literature to corroborate that of the Eira. But when you take up the question of the particular change which takes place in meat from its fresh to its stale condition, you will find a great deal of diversity and little harmony at opinion. Without taking up other authors on the subject, we stick to Parkes and compare his with Pr. I ; life'.-, views on this point. Parkes thought "fresh, and especially raw meat, is also useful, and this is conjectured to be from its amount of lactic acid ; but this is uncertain,"1 while on the other hand Dr. Ralfe repeats, as a probable explanation, too, of the reason of fresh meat being an anti scorbutic, but that it is due to the absence of lactic acid. For, from well-known chemical facts he deduces the following: — " In hot climates meat has to be eaten so freshly killed that no lime is allowed for the development of the lactic acid : in arctic regions the freezing arrests its formation. The muscle plasma, therefore, remains alkaline. In Europe the meat is invariably hung, lactic acid is developed freely, and the muscle plasma is consequently acid. If, therefore, scurvy is, as I have endeavoured to show ("Inquiry into the General Pathology of Scurvy"), due to diminished alkalinity of the blood, it can be easily understood that meat may be antiscorbutic when fresh killed, or frozen immediately after killing, but scorbutic when these alkaline salts have been converted into acid ones by lactic acid decomposition.'"-' The view of the alkalinity of the blood coincides with Dr. Garrod's theory, which, however, appears to have as a sine qua turn the absence of a particular salt- namely, potash. I am inclined to think that, taking into account the nervous symptoms which are not infrequently associated with a certain proportion of scorbutic cases, resulting probably from the changes taking place in the blood, not unlike those which occur in gout and rheumatism, there must be some material change produced in the sympathetic system. In many of the individuals tainted with scurvy there were slight and severe attacks of passing jaundice in the cases which occurred in Afghanistan. Can we possibly trace this icteric condition to this cause? This is but a conjecture so far. But there certainly is in Garrod's observations an important point which, if applicable to all countries, climates, and conditions of life, is sufficiently weighty to indicate the necessity for farther research in that direction, and that point is this : the scorbutic condition disappeared on the patient being given a few grains of potash, though kept strictly on precisely the same diet which produced scurvy. —I am, Sir, yours truly, Ahmedabad, India, 30th Sept., 1882. JOHN C. LUCAS."

[1]Note: I have taken the liberty to change just a couple of unimportant words in these passages to serve as a watermark. Why? Because I have taken much pain to chronicle this. With other passages in the past, I have sometimes even had to write them out by hand, only to find them copied and pasted into other people's blogs on the topic with absolutely no attribution, as if they conceived the whole topic and did the research themselves. Please, if you find my work useful, cite me!

76 comments:

  1. It's always fascinating for me to read the things you post on this blog! If we ever meet again one day, I'd very much like to ask you more about your diet (assuming you don't mind a few questions that you've probably heard a hundred times before).

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    Replies
    1. I do hope we meet again! It's been far too long. Thank you for reading, Tristan. I could talk about this stuff ad nauseum. :-)

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  2. FASCINATING! Thanks so much for this post, Amber. And thanks especially for your thoughts on the fresh versus hung meat, and why any reduction in vit C that potentially occurs during the hanging/aging process might affect those who eat significant carbohydrate, but not those who don't. Because you're right -- from what little I know of the zero carb folks, many of them *don't* eat organ meat, and they're getting their meat from the regular ol' American supermarket, where the meat has presumably been hung for at least some amount of time.

    Great stuff. Thanks again! (I'm going to write a post soon about pig feet, oxtails, and other very collagen-rich cuts, and I will definitely link to this when I explain about collagen -- including why it's not absolutely necessary to eat those extra-rich sources, since plain ol' muscle meat still has enough.)

    Now we have to wonder what *other* nutrients the official guidelines have gotten completely wrong (based on differing diet composition). My initial guess would be most of them. :-/

    ReplyDelete
    Replies
    1. Thank you so much, Amy!
      I'm looking forward to your post. It sounds delicious. ;-)
      My initial guess would also be that most of the guidelines are inapplicable. Sigh.

      Delete
  3. I wonder if anyone ever took time to THINK and Question how populations in frozen tundra areas survived so well and never had scurvy! Answer: OFFAL, Meat and Blood! ( Whale and seal liver is v high in Vit C) WE are carnivores, first and foremost! Thanks for your brilliant writing and research!

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    Replies
    1. Thank you, Shaza. I agree with you, although part of what I'm trying to suggest is that the role of offal, blood, and blubber has been vastly overstated, because of the lack of recognition that (a) under a low carb diet, much less vitamin C is needed, and (b) even muscle meat has adequate amounts.

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  4. New Zealand Company brand ground lamb in the local Sobeys here in Newfoundland showed on label 2% Vitamin C per 100 grams.

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    Replies
    1. That's great! That would mean they measured about 1-2mg per 100g, so consistent with the chart above. I'm glad they list it.

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  5. Thank you for this blog, just spent a few hours reading all of it.

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  6. I speculate that it's not an oversight that humans evolved to being one of the mammals that can't manufacture their own vitamin C. Apparently as we evolved, a lot of vitamin C was not a necessity. That would seem to indicate that if we are eating a diet that requires Vitamin C supplementation, we're doing something wrong.

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  7. hi, can you please tell me your opinion on this ?
    https://www.youtube.com/watch?v=LylJ0OOcONg
    im really conflicted right now

    ReplyDelete
  8. The thing is, no evidence is forthcoming for longevity of meat-heavy cultures. The Eskimos had atherosclerosis actually worse than urban Swedish and Finnish. They also had twice as many strokes and way more osteoporosis (those two were the worst of their health outcomes, quite a bit worse than their atherosclerosis actually). And they at least ate lots of fish (which is consistently associated with good health outcomes).

    Meanwhile, the Okinawans ate very little meat and lots of vegetables, and some fish. They lived a long time.

    Amongst developed countries with a lot of data, the Japanese (despite the high male smoking rate) have the highest longevity and are ranked only 88th for meat consumption (whilst being 7th for seafood consumption). Switzerland are 2nd for longevity and they are about 50th, South Korea are 3rd for longevity and 75th for meat consumption. Australia is a country in the top 10 for both meat consumption and longevity but it's the only one. The United States is 2nd for meat consumption and 31st for life expectancy.

    Sure there would be other factors in all of this but honestly if eating lots of meat was good for your longevity it would come through in the data like it does for fish, nuts, fruit and vegetables.

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    Replies
    1. Dear Unknown,

      I don't see what this comment has to do with vitamin C.

      Since you bring up the topic, though, the atherosclerosis data you are alluding to is from the late 20th century and bears no relevance to their traditional diets. The Okinawans appear to have chronic caloric restriction.

      In any case, I do not share your faith in epidemiology. It doesn't take a graduate degree in computer science and the study of machine learning I've had to recognise that the data input to those observational analyses are too skewed to answer the right questions, even if they could establish causality, which they can't. It would be like asking a program trained on only desert regions to tell you the effect of moss on the ecosystem.

      Delete
    2. "Amongst developed countries with a lot of data, the Japanese (despite the high male smoking rate) have the highest longevity and are ranked only 88th for meat consumption (whilst being 7th for seafood consumption)."

      The country with the highest life expectancy is Hong Kong, which has one of the highest, if not the highest, meat consumptions per capita, with 664 g of meat per day, or 242.36 kg per year.

      https://www.worldometers.info/demographics/life-expectancy/
      https://www.hku.hk/press/news_detail_17940.html#:~:text=The%20HKU%20research%20shows%20that,times%20higher%20than%20the%20UK.

      Delete
  9. Hi Amber! I have been low carb/keto for 7 years and it changed my life. I had been going more carnivore of the years and hearing you on Keto Savage and Shawn Baker inspired me to take the leap into full carnivore about 3 months ago. I'm 35 years old, very athletic, and I feel/look/perform better now than I ever have. However, I've noticed my blood pressure is quite high (like 160/90). Resting pulse is 60. I'm hesitant to ask a regular doc because I know they won't understand my "unorthodox diet". I haven't been able to find any info on this type of scenario and I don't know if I should be concerned or not. My email is adam@wexelblattart.com, drop me a line if you have any insight you would care to share... And thank you for being such amazing advocate for carnivore!

    ReplyDelete
  10. As always, good stuff Amber! Thanks for your efforts and always providing such quality resources to the carnivore community.

    ReplyDelete
  11. Hi Amber, cool stuff! I am unable to locate your referenced Lancet Article from the 19th century. I find papers discussing the re-occurrence of scurvy in the British navy around 1870. The cure for scurvy was found in the 18th century already by Lind : Lemon Juice. After that the disease was mostly gone, because ships were equipped with lemon juice.
    But for a naval deployment in the 1870‘s they ordered lime juice instead of lemon juice. That is why the disease broke out again. I find no references to your mentioned discussions on fresh meat being the cure.

    ReplyDelete
    Replies
    1. https://pdfs.semanticscholar.org/123e/bc0bd57683f8d8cfa0bee98a016fc5f2f37b.pdf

      Delete
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  19. Could just test the meat yourself to put the matter to rest. Blending up a rib eye with some water should be testable.

    https://www.livestrong.com/article/338206-how-to-test-vitamin-c-in-fruits-at-home/

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  24. Meat Science Volume 70, Issue 1, May 2005, Pages 35-44 https://www.sciencedirect.com/science/article/abs/pii/S0309174004003006

    Lists values of vitamin C in beef ranging from: 15.92 ± 3.48 (Grain Fed) and 25.3 ± 10.0 (Pasture Fed) μg/g

    ReplyDelete
    Replies
    1. I was able to download the PDF to this study and got more info.

      The link below is to a study that analyzed the Vitamin C content of the Psoas Muscle PM (Tenderloin, New York, T-Bone, Porterhouse) in Grain Fed and Pasture Fed cows with and without vitamin E supplementation. After converting mcg/g to mg/oz it looks like a 10 oz Pasture Fed PM steak with no supplementation has about 7 grams of vitamin C. You will need to download the PDF for the full text.

      https://www.researchgate.net/publication/222565651_Influence_of_pasture_or_grain-based_diets_supplemented_with_vitamin_E_on_antioxidantoxidative_balance_of_Argentine_beef

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