Should salt be included in a Zero Carb diet?

The subject of salt is a bit complex.

On the one hand, Owsley “The Bear” Stanley – who ate a Zero Carb diet for over 50 years – felt that salt should be avoided. Here are some of his comments regarding salt that he posted on a now-defunct low carbhydrate internet forum he participated in during 2006:

“I don’t use salt.”

“Salt is not good for a fat burner.”

“Salt is not good in your food, it is a chemical and will damage your skin and your kidneys over time. It also interferes with fat metabolism.”

“When I was a dancer, I used no salt in anything. I drank huge amounts of plain water during class and never had a bit of problem, whereas the other dancers scarfed salt tablets like candy and still had problems.”

“I sometimes sweat so proficiently that I need to drink 3 or four liters of water in less than an hour. I have no effects of low salt, and my sweat is never salty. I used to watch the other kids in ballet class scarfing slat tabs, while I just drank water. My shirt was very wet, but dried out normal, while theirs were rimed with a heavy white salt crust – indicating that the massive excess of alt was simply being dumped. If they did not eat the salt tabs when drinking water, they fainted.”

“Adding salt to food is not good. If you eat nothing but steaks you will never have any deficiencies.”

“It only takes about one ounce of any meat/day to supply all the sodium your body requires for normal saline balance.”

“Salt is an addiction. It is culturally induced by the need to add some salt for flavor in vegetables.”

“When I gave up salt, the only food that I ate which seemed to need salt was eggs, but after a few years this passed. Unsalted butter made the difference – without that added fat eggs are definitely very bland.”

“Take care to only buy and use unsalted butter. Salt in butter is there as a preservative, thus the level is very high. Unsalted butter is a bit more expensive because only very fresh cream can be used to make it, whereas soured cream – neutralized with soda – is used to make regular butter that is then preserved with salt.”

“Taking in more salt than you body needs is very, very bad for you. If your sweat tastes salty, you have too much intake. Both the skin and the kidneys dump salt, but cannot ‘change gears’ quickly. Both organs are affected by passing salt. The salt content of sweat and urine can go down to a few parts per million, to conserve the saline balance of the bodies tissues.”

“If addicted to salt – just like with any other addiction – when you stop using, you will experience side effects, such as everything suddenly seeming tasteless and bland. If you persist, salt becomes vile-tasting, and food without salt very tasty. It takes several days for your body to stop dumping salt through the skin and kidneys and begin conserving it, so when quitting, be aware of your salt balance. You may experience light headedness and the other classic signs of low sodium, if necessary take a tiny pinch, but try to stop all salt as quickly as you can tolerate it. I consider it a chemical poison.”

“Human commerce in salt began with the use of vegetation as a major item of human food. Only herbivorous animals will seek out and consume salt – because sodium is lacking in all terrestrial plant tissues. Carnivores do not need any salt. Your taste for salt on meat is learned behavior only.”

“Chemical salt should always be avoided, it interferes with fat metabolism when the body carries an excess. If you are getting too much, your sweat will taste salty. It takes about a week for the body to stop spilling salt in the urine and sweat.”

It should be observed, however, that in spite of Mr. Owsley’s strong anti-salt stance, he did eat a few ounces of salt-containing cheese almost every day (based on the comments he made in the above mentioned forum). Therefore, it is questionable whether his own personal experience can actually be taken as an example of practicing a Zero Carb diet with Zero Salt.

Nevertheless, many of the long-time practitioners of Zero Carb eating -whom I have met through the Facebook group Zeroing in on Health – have stated that they also do not consume any salt. This is not universally true, but it is the case for a significant percentage of them. The health and well-being of those who do not add salt to their food does not seem to be negatively affected by the absence of salt in their diet. Likewise, the health and well-being of those who have continued to include salt in their Zero Carb diet also does not seem to have been negatively affected. Some have even stated that they can take it or leave it with out ill effect.

On the other hand, Dr. Stephen Phinney and Dr. Jeff Volek have argued that eating a low carbohydrate, ketogenic diet increases an individual’s need for sodium. Here are two excerpts from their seminal books which explain the science supporting their recommendations:

“Whole books have been written about the history of salt. Wars were fought over access to salt. Roman soldiers were often paid with a measure of salt, hence the origin of the English word ‘salary’. Hunters and their prey, herders and their cattle, all shaped their actions and habits around access to salt. The reason, of course, is that salt (sodium) is necessary for life.”

“Humans did not need to know chemistry to understand the value of salt. Salt deprivation leads to lightheadedness, fatigue, headache, and malaise. Aboriginal cultures could figure out that if they drank from one spring, they began to feel lousy, but if they drank from that other one, they’d feel OK. The Inuit knew which ice to melt for water to boil their meat. Sea ice loses its salt content with age. Fresh ice had too much salt, fresh snow had none, whereas older sea ice was just right.”

“Inland hunters followed their prey to salt licks and salt springs. These waters were prized for cooking, and some cultures learned to dry these waters to make dry salt. But the universal dependable source of salt for inland hunters and herders alike was blood. Blood was collected from freshly killed animals using the emptied stomach as a container, whether from a bison on the Great Plains or from caribou or muskox on the tundra. A liter of whole blood contains about 2 grams of sodium, so 500 ml per day would ward off acute symptoms of salt depletion.”

“Among the Masai living in hot inland Kenya, the consumption of blood was a staple of their culture (along with meat and milk). Even in the 1920’s, long after British trade had provided them access to dry salt, the Masai still bled their cattle to provide each hunter with a token 50 ml of blood per day[6]. Given another century of perspective, perhaps the pejorative phrase misrepresenting many aboriginal cultures as ‘bloodthirsty savages’ might better be replaced by the phrase ‘bloodthirsty savants’.”

“The amount of carbohydrate in our diet changes our need for salt. High carbohydrate diets make the kidneys retain salt, whereas a low carbohydrate intake increases sodium excretion by the kidney (called ‘the natriuresis of fasting’). Hunting cultures seemed to understand this, and thus their highly evolved practices of finding sodium and consuming enough of it to maintain health and well-being…”

“…all carbohydrate-restricted diets, even ones providing 50-60 grams of carbohydrate like Dr. Hoffer’s mixed diet, are natriuretic – they make the kidneys dump sodium. Now, if you are bloated, edematous, or hypertensive, ‘dumping sodium’ is a good thing. But if you do not (or no longer) have these fluid-excess symptoms, then over-excretion of sodium results in the above list of symptoms.”

“And more worrisome, it can have negative health effects as well. Sodium is the positively charged ion that the body uses in its circulating fluid (serum and extracellular fluid) to balance the concentration of positive charges from potassium that is concentrated inside cells. The membrane enzyme sodium-potassium ATPase is the ion pump that keeps both of these cations separated and in the right place”.

“For nerves, muscles, and other cellular functions to work right, neither of these ion concentrations can deviate much from that of the other. With severe sodium restriction (like 1.3 grams per day, combined with the natriuretic effects of carbohydrate restriction), the body responds first by mobilizing any excess extracellular fluid (which is why bloating disappears) and then by contracting its circulating volume. It is this contracted circulating volume that causes dizziness, headache, and ease of fatigue.”

“At some point, when confronted with this low sodium intake plus carbohydrate restriction, most people’s defense mechanisms can’t maintain normal mineral balances. So the body’s next level of defense is for the adrenal gland to secrete the hormone aldosterone, which makes kidney tubular cells excrete potassium in order to conserve sodium. That is, the body wastes some of its intracellular potassium in order to cling to whatever sodium it can. However unless there is copious potassium coming in from the diet, this excess urinary potassium comes from the body’s potassium pool inside cells.”

“Two things then happen. First, nerve and muscle cells don’t work well, leading to cardiac dysrhythmias and muscle cramps. Second, because potassium is an obligate component of lean tissue, the body starts losing muscle even if there’s plenty of protein in the diet. Clearly none of these effects of sodium restriction are desirable, particularly when one is trying to lose body fat while retaining as much lean tissue as possible. Luckily, if in the context of a low carbohydrate diet you give the subject/patient a total of 5 grams of sodium per day (for example 2-3 grams on their food and 2 grams as broth/bouillon), none of these bad things happen.”

From: The Art and Science of Low Carbohydrate Living

“Most athletes sweat, and sweat contains salt. Both sweat and blood taste ‘salty’, because both contain an appreciable amount sodium. The only place inside your body where you find much sodium is in the blood, so if you run short of it, there’s not much ‘on reserve’ elsewhere in the body. Thus, if you don’t have enough sodium, your circulation (aka circulating blood volume) has to shrink. Sweat too much and your body runs short of sodium, and this forces it to shrink your blood volume to keep serum sodium concentration in the normal range. Shrink your circulating volume too much and you pass out.”

“Thus salt is a critically important nutrient for athletes, and this is especially true on a low carbohydrate diet. When carbohydrates are restricted the body changes from retaining both water and salt to discarding them. Because of this fundamental shift in mineral management, it’s not uncommon for people to lose 4-5 pounds of water weight during the first week of a low carbohydrate diet. Typically, only half of that first week’s weight loss is from fat and the other half is due to salt loss along with its associated water. If some of that salt is not replaced, however, blood flow may be impaired and the body over-reacts in its quest for salt. This primarily happens in the kidneys, which try to compensate by wasting potassium (i.e., kidney cells give up potassium in exchange for retaining sodium), leading to a negative potassium balance.”

“When carbohydrates are restricted, the body changes from retaining both water and salt to discarding them. Because of this fundamental shift in mineral management, it’s not uncommon for people to lose 4-5 pounds of water weight during the first week of a low carbohydrate diet. Typically, only half of that first week’s weight loss is from fat and the other half is due to salt loss along with its associated water. If some of that salt is not replaced, however, blood flow may be impaired and the body over-reacts in its quest for salt. This primarily happens in the kidneys, which try to compensate by wasting potassium (i.e., kidney cells give up potassium in exchange for retaining sodium), leading to a negative potassium balance.”

“What does all this mean? The loss of water and salt can reduce plasma volume and make you feel sluggish and compromise your ability to perform outdoors in the heat or in the weight room. As a result, some people get headaches and feel faint. This state of salt depletion causes a compensatory loss of potassium, which has a negative impact on muscle mass since potassium is a necessary co-factor in building and maintaining skeletal muscle. The easy solution is to routinely take 1-2 grams of sodium per day in the form of 2 bouillon cubes (or home-made broth).”

From: The Art and Science of Low Carbohydrate Performance

When a person first begins a low carbohydrate, ketogenic diet the body dumps a lot of sodium which can make the transition from a carbohydrate-based diet to a fat-based diet very unpleasant (sometimes referred to as the “keto-flu”) if you do not consume enough salt during this process. It can take a few weeks to enter a state of Nutritional Ketosis and become an efficient fat-burner. This is also known as being Keto-Adapted or Fat-Adapted. This adaption period can take several weeks. Once it is complete, however, it it possible that extra salt is not necessary. This learn more about this process please read my article on Adaptation.

Interestingly, there is a case history in The Art and Science of Low Carbohydrate Performance of David Dreyfuss – a long-distance runner – who does not consume any extra salt during cold-weather runs and has not experienced any problems with his athletic performance as a result. He says,

“In hot weather I did take some salt, but I do not even use salt in cold weather… Dr. Phinney believes that increased sodium intake may be necessary during a low carb diet. My own experience has been that I can pretty much ignore the issue. I grew up in a low-salt household and still use added salt very sparingly. Outside of exercise and in cool weather, I use no electrolyte supplements. In very hot weather, I have a simple trick which seems to reduce my need for salt replacement: about half the water I use is dumped directly on my clothes. It’s a lot more efficient to use it directly for evaporative cooling than to consume it and then sweat it out again. I follow the usual guidelines of drinking to thirst. I also generally keep track of urine output (i.e., that there is some every few hours) to double check that I’m not dehydrating excessively. Surprisingly, I’ve generally found that my total water consumption (again, anecdotally and not quantitatively) is significantly less now than it used to be. Just training? Nutrition? I don’t know. I have no cramping and no stomach issues. As long as my muscles have adequate reserves, I just don’t experience any problems.”

However, the long term effects on muscle maintenance may become an issue for him as Phinney and Volek have described above. The jury on this still seems to be out and is definitely a worthy area for further research in my opinion.

I personally went for years without eating salt. But after reading Dr. Batmanghelidj’s fascinating book Your Body’s Many Cries for Water, I decided to reintroduce it. Dr. B argues that the body’s cells need sodium in order to maintain proper hydration. In one of his other books, he gives a number of case histories of individuals who had been consuming plenty of water, yet were still dehydrated because they were following a salt-free diet. After adding salt back into their diets, these individuals experienced dramatic health improvements. Therefore, Dr. B recommend adding about 1/8 of a tsp. of sea salt to every quart of water.

I decided tofollow Dr. B’s recommendation and discovered that I also felt better once I started consuming salt again. This may be due to the fact that I have severe Histamine Intolerance. Excess histamines cause low blood pressure, and salt helps to raise blood pressure. At the time I reintroduced salt into my diet, I did not know that I was Histamine Intolerant, so I was still consuming a a lot of high-histamine foods. It is certainly possible that if I can maintain a low-histamine diet for a while, I may reach a point where I do not feel the need for added salt in my diet. It is something I may experiment with in the future.

I personal prefer Celtic sea salt over Himalayan rock salt because it tastes better to me. I never use commercial iodized salt because – not only does it taste terrible – but the type of iodine it contains is not the best form of this mineral. Iodine is very important for over all health, so if you feel you may be deficient it would be better to use a product like Lugol’s solution (and read Primal Body, Primal Mind by Nora Gedgaudas for more information about iodine and proper thyroid function).


It is highly probably that humans have been seeking out sodium rich foods and salt deposits for as long as we have been human. Many anthropologist feel that humans evolved along coastal areas where sea salt, seaweed, and seafood would have been regularly consumed. There are lots of convincing reasons in support of this perspective and it is the one that I personally find most compelling. If you are interested in exploring this subject further, I recommend the book Nutrition and Evolution by Michael Crawford and David Marsh. This perspective also supports the idea that higher omega 3 fatty acids – EPA and DHA – in the diet where one of the factors that lead to our large brains.

Finally, it has be shown that wild animals – including other primates – seek out food and water sources that are naturally high in sodium. For example, Decaying Wood is a Sodium Source for Mountain Gorillas:

“Like several other non-human primates, mountain gorillas (Gorilla beringei beringei) in Bwindi Impenetrable National Park, Uganda consume decaying wood, an interesting but puzzling behaviour. This wood has little obvious nutritional value; it is low in protein and sugar, and high in lignin compared to other foods. We collected pieces of wood eaten and avoided by gorillas, and other foods consumed by gorillas, and measured their sodium content. Wood was substantially higher in sodium than other dietary items, and wood pieces from stumps eaten contained more sodium than those that were avoided. Wood represented only 3.9% of the wet weight food intake of gorillas, but contributed over 95% of dietary sodium, leading us to conclude that decaying wood is an important sodium source for Bwindi gorillas. Because sodium has been leached from the weathered soils characteristic of the subhumid and humid tropics, and because terrestrial plants generally do not require sodium, tropical herbivores, including gorillas, often encounter problems locating the sodium essential for their well-being. Decaying wood is an unexpected sodium source.”

As I stated at the beginning of this article, the issue of sodium is a bit complex. I have tried to examine it from a variety of directions, so that you will have a more complete understanding from which to make a decision. Knowledge is power. The best approach would be to simply experiment for yourself, as the only thing that really matters – after all is said and done – is how YOU personally feel.

35 thoughts on “Salt

  1. This makes a lot of sense to me and explains some of my reactions to zero carb. I have been having very small dizzy spells when standing up from my desk in mid afternoon. I have been drinking water like a fiend – about 4 quarts a day- and I still have a dry mouth all the time. I have been craving salt and eating a lot of it, but my fingers are not puffy like I would expect. I wake in the morning with a bit of a headache, which usually goes away after an hour or so, but today it is sticking around. I don’t sleep well, and leg spasms (not exactly a cramp, more like the urge to wiggle) keep me awake.

    That said, I also have a lot of energy. I do not have cravings and I feel “sunny,” if that makes sense.

    Esmee, would you have any advice?


  2. I have read directions for making a brine that you add to your water everyday and it is supposed to help hydrate your cells. You add 1 tsp of sea salt to about a qt of water and shake it up and let it sit for 12 hours or more. Then you pour the brine into a clean jar and leave the sediment in the other jar. You can use the sediment for killing unwanted plants. Then you add 1 tablespoon of the brine water to every qt of water that you drink.


  3. For some strange reason I cannot explain salt has never ever in my life been an issue for me. I mean I have followed just about every dietary advice you can find but I never applied it to salt. I seem to have a very well functioning “salt-meter”: sometimes I want it, sometimes I don’t. Sometimes I salt my eggs and my meat, sometimes I don’t. It happens that I get up from my desk just to get myself a few grains of coarse sea salt, and then for days and weeks I don’t. I have absolutely no clue on what it depends. I don’t practice any sport, I go for walks with my dogs every day, but usually rather leasure walks, my way of salt intake does not depend on seasons, it’s the same in winter and in summer.
    Last but not least, I have been eating salt in the above described way since childhood.


  4. Salt is sodium chloride chemically. When eating an all meat diet, I would think you need quite a bit of chlorine to make hydrochloric acid in the stomach to digest the meat eaten. So we also need to consume salt for the chlorine it contains, not just for the sodium.


  5. Hmm. Jeff Volek seems like the smartest guy talking about low carb diets, and yet his approach to salt in that matter seems to be focused on the adapation period – as if one’s body as seen in the adaption period, is what is to be expected permanently. That it won’t adapt in regards to salt and potassium. I’d like to see him produce some data showing the progression in regards to salt retention in people over the period of a entire month or so, as people try a low carb diet. And not just the period immediately following the dietary change.


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  7. Great article, as usual Esmee! I love how you show both sides of the argument as it proves once again that what works for one, will not work for the other. Here is my experience with salt. After 3 years on ketogenic diet, I still have to supplement with 5 grams of sodium per day, if I don`t, I start to get into trouble. Light headed, feel weak, cannot perform on bike as well. I never use any processed, store bought salt. If I eat out at a restaurant, I always bring my own salt.


    • Thanks for your comment jcyr. I believe that salt is addictive in the sense that when we consume it, our bodies get used to having a lot of extra around and the kidneys eliminate most of it. When we suddenly stop eating salt, the kidneys are still upregulated to eliminate a lot of it. This means they eliminate too much for a few weeks until they get reoriented to the new low salt paradigm. The result is that we experience a variety of unpleasant or negative symptoms like dizziness and fatigue until the kidneys slow down their elimination process. In other words, I believe that stopping salt can be almost as unpleasant as stopping carbohydrates and one must be prepared for their body to go through an adaptation period of feeling suboptimal. And if one does chose to consume salt on a Zero Carb diet, I feel that supplementing with potassium is extremely important, as too much extra sodium will upset the sodium-potassium balance. This is not as critical on a Low Carb diet that includes some plant foods like leafy green which are provide more potassium than a meat-only diet.

      Liked by 1 person

  8. yet another fascinating piece….I have wondered about salt for so long and you answered it. Whenever I would add salt to my food, my stomach would hurt, nose would start running and sneezing the next couple hours. I feel like my heart rate would go up, I would get irritated. I have read that salt eats away/removes the mucus lining of your intestines, which is good mucus too, which isn’t a good thing. Thank you for sharing this, I won’t be every touching salt again, as long as its not being stuffed down my throat :).


  9. this article is great. I read it over and over, some very good information. The one on Owsley The Bear, thats a good one too. I found salt to be a culprit to many of my digestive issues, mental and neurological. I cut the salt out awhile back. Cut the dairy too, which is unfortunate, because lots of dairy has added salt as preservative. I haven’t been able to find any cheese without salt, otherwise I would try it. But if I do dairy, I do unsalted for sure, but that is once in a blue moon.


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  12. Awesome article! I was starting to reconsider my salt consumption after reading the interview with “Owsley the Bear,” but I am glad that I found/read this article as it help me put salt in perspective for me. My preferred read meat is Lamb because it is has the right fat to protein ratio for me and the meat is loaded with minerals. I like to bake my meat on low heat in the oven until light brown and juicy as it releases the myoglobin, which turns from red to a brownish color. It just so happens, that I had cut out salt for a few days after reading “The Bears,” interview and I found myself licking the myoglobin right off the plate after finishing my meat because it was salty. I could a drank a liter of it, that is how bad I wanted it. I too recently found and followed doctor Batman’s advise to increase salt and water intake. Sodium and Potassium have been my main two issues, since I became really ill 5 years ago. I could not figure out how to keep the body chemistry balanced until now and I have paid for it dearly, but I am still here, so there is always hope and the last year of my journey has been the most amazing as it has all just finally come together for me. I have been plagued by one illness or another pretty much since birth, so seeking perfect health has been my lifelong desire/dream. At the 32 when I found myself declining in health and then at 37 I found my self severely ill to the point of almost dying. That was the game changer that made me change everything and start my search to better health. I would like to add that magnesium supplementation in the form of the original Zechstein crystals is a god send as well. I a tiny crystal in each glass of water with my salt and it just cools and lubricates the body in a way, that is hard to describe. The stomach functions better as well with more Mag, but the only form I trust is from the original Zechstein sea bed. Anyway, live and learn! Life goes on…. I guess this explains why Gerson had to give so much potassium salts, since he completely restricted as he believed it fed cancer cells, even though the diet was all veg. To be honest, even when I did the Gerson therapy for over a year, I never thought any of those people on the diet for life or who did the therapy looked too healthy to me.


    • I have recently increased my salt consumption to 2 tsp per day and I personally feel much better at this level. Another book worth checking out is Salt Your Way to Health by Dr. Brownstein. I have not read it yet, but it looks good.


  13. Ater decades of very litle salt, none added, ever and mostly no processed foods, my own borne broths and mayonnaise etc NO SALT with complaints of swollen ankles and always cold legs and feet, I added salt to my diet three days ago. A LOT! I thought while I was doing it this can’t be right, but…. I heard Phinney talking about salt. Not quite in this way but it somehow piqued me to wonder. Three days of adding Kosher salt to everything, even my own bone broth.

    I now have ankles again. Almost boney. My legs and feet are still a bit cold at night, but not freezing to the point of pain.

    Could it be connected?

    Liked by 1 person

  14. How do the zero carbers, particularly those eating “meat and water only diet” get their iodine, if they avoid salt? Is iodine irrelevant on zero carb or meat and water only diet?


    • Even the Zero Carbers who do eat salt generally eat a natural sea salt or Himalayan salt, neither of which have Iodine, and iodized salt is not adequate anyways. The subject of Iodine is an important one, and should be explored. You may want to read The Iodine Crisis by Lynne Farrow for a comprehensive overview of this issue.


  15. I’ve been on a low carb keto diet for ~ 2 months and am having a hard time figuring out my optimal sodium levels. I’ve been regularly having calf and foot cramps during the night so assumed i needed more sodium. But everything i’m reading says that the first symptoms of too low sodium are headache and dizziness, and i have none of that. I’ve been adding 1/2 tsp. salt per day to my food and have been considering upping it with a bouillon cube each day, but now i’m wondering if the problem is inadequate WATER. (I’ve been drinking ~ 64 oz per day.) Do some people get the cramping from low sodium WITHOUT the headache/dizziness symptoms? Any suggestions? (Thanks!)


    • Phinney and Volek recommend between 2-3 tsp of salt per day on a low carb diet. That is too much for me personally, but you may need more than the 1/2 tsp you are currently taking. Try to increase it by 1/2 tsp and see if that helps.


    • 9. Muscle Cramps: Unnatural Complications of a Highly Refined Diet

      A distressing number of otherwise healthy people have frequent muscle cramps, and in the worst case, a muscle cramp of the heart equals sudden death. Physicians don’t like to deal with muscle cramps because the only effective medication we had to stop them was banned in 1992 due to unacceptable side effects.

      Muscle cramps are the end result of many contributing factors, including overuse, dehydration, and mineral inadequacies. Low serum potassium is not uncommon in people with frequent cramps, so physicians often try potassium supplements. However there is a daisy-chain leading back from muscle cramps to low blood potassium to intracellular magnesium depletion. Low carbohydrate diets don’t cause muscle cramps per se (meat and leafy greens are good sources of magnesium), but neither do they miraculously get better on low carb regimens unless the underlying problem is dealt with. This is just one more reason why leafy greens and home-made broths (good sources of magnesium) are desirable components of a healthy low carb diet.

      So here’s the shortcut to ending most nocturnal or post-exercise muscle cramps. Take 3 slow-release magnesium tablets daily for 20 days. The proprietary brand-name product is ‘Slow-Mag’®, but there are a number of equally effective generics at a fraction of the brand-name price (e.g., Mag-64® or Mag-Delay®). Most people’s cramps cease within 2 weeks of starting ‘Slow-Mag®’, but you should continue to take the full 20-day course (60 tabs per bottle at 3 per day lasts 20 days). If the cramps return, do it again, and then continue taking one tab per day. If the cramps return, take 2 tabs per day. Most people can be titrated to remain crampfree by this method. Why use a more expensive slow-release magnesium preparation like Slow-Mag®? Because magnesium oxide preparations like ‘milk of magnesia’ cause diarrhea, passing through the small bowel before they can be effectively absorbed.

      WARNING: The only contraindication to oral magnesium supplements is severe renal failure (e.g., a GFR < 30). If you have any history of kidney problems or known loss of kidney function check with your doctor before taking Slow-Mag® or its generic equivalents.

      Phinney, Stephen; Volek, Jeff. The Art and Science of Low Carbohydrate Living: An Expert Guide to Making the Life-Saving Benefits of Carbohydrate Restriction Sustainable and Enjoyable (Kindle Locations 4221-4238). Beyond Obesity LLC. Kindle Edition.


  16. Yikes — no wonder i’m so confused! I’ve been using Magnesium Glycinate 3 chewables a day. Esmee — do you know why magnesium gives you muscle cramps? And Shaun — is slow release so different that it could account for my cramping? (I’m also eating spinach & avocado daily, and salmon and meat during the week.)


    • I think there is a lot of research still to be done on magnesium and absorption. Some claim the oxalate in spinach keeps you from absorbing much of the magnesium. Some will point out that, in the US, our soil has become so depleted of magnesium that a lot of farmed spinach and avocados don’t have as much magnesium as nutrition info claims in the first place. Some claim that having a magnesium deficiency causes a decrease in magnesium absorption (so those who have long been deficient have a hard time getting back to a healthy baseline, which is necessary for the body to better absorb it.) Some claim that transdermal magnesium (magnesium oil) is the most bioavailable way to absorb it. Magnesium glycinate is typically considered to be among the most bioavailable of the different types of magnesium you can supplement, so you’ve got that going for you.

      I personally used to have a lot of heart palpitations, high blood pressure, and often got headaches, even on a ketogenic diet. I was even put on a halter monitor for 24-hours by my cardiologist to monitor the palpitations. I began taking magnesium and, over time, all of these problems subsided. I now take one Doctor’s Best High Absorption (per the label, one dose is two pills, but I only take one), three NOW brand ZMA capsules (the recommended dose for men), and a “dose” of transdermal magnesium oil every day. I no longer have palpitations, my blood pressure has normalized, and I no longer get headaches.

      Because I think the general research is a little lacking on magnesium, I don’t feel confident in directly answering your question to me. What I do know is a lot of low carb resources list magnesium deficiency as the most common cause of cramping in low carbers. Maybe the info here will help you begin to think about what you might want to try next. Sorry I couldn’t answer more directly, but I hope this helps!


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