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Ketogenic Diet

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{{DISPLAYTITLE:An Introduction to the Ketogenic Diet}}The ketogenic diet restricts carbohydrate intake, and to a lesser extent protein intake, to the point where the body converts that fat into ketones. These ketones are an alternative fuel source for most cells in the body, supplementing or replacing glucose as a critical fuel source. The [[Ketogenic Diet as a Treatment| ketogenic diet has the potential to help with a number of health conditions]], but also has [[Health Risks of the Ketogenic Diet| some significant potential health risks]].=Who Should Consider the Ketogenic Diet?=The table below reflects my personal thoughts on who would be good candidates for the Ketogenic Diet.{{Skeleton}| class="wikitable"! Situation! Recommendation! Alternatives! Rationale|-| Epilepsy| A – aggressively pursue with your neurologist/find a specialist who uses the Ketogenic Diet| [[MCT Diet]], [[Modified Atkins Diet]] or [[Low Glycemic Index Treatment]]| There is overwhelming evidence that the Ketogenic Diet can help a significant portion of epilepsy suffers, and the condition is serious enough to outweigh the health risks.|-| Cancer| A – aggressively pursue with your oncologist/find a specialist who uses the Ketogenic Diet| The Ketogenic Diet may need to be combined with calorie restriction and combined with other treatments| While the research is still only at an emerging state, the condition is so serious that is vastly outweighs the health risks.|-| Alzheimer's disease | B – pursue with your neurologist/try alternatives first| [[MCT Diet]] or [[MCT]] supplementation | While the research is still only at an emerging state, the condition has few alternative treatments so the benefits probably outweigh the health risks. Trying MCT supplementation or the MCT Diet is probably appropriate before trying the full Ketogenic Diet.|-| Parkinson's disease| B – pursue with your neurologist/try alternatives first| [[MCT Diet]] or [[MCT]] supplementation | There is very little research, but the condition has few alternative treatments so the benefits probably outweigh the health risks. Trying MCT supplementation or the MCT Diet is probably appropriate before trying the full Ketogenic Diet.|-| Schizophrenia| B – pursue with your specialist/try alternatives first| Gluten Free Diet| While we only have a few case studies, the potential benefit of this horrible condition probably justifies the health risks. Trying the gluten free diet first is probably appropriate. |-| Amyotropic Lateral Sclerosis| C – talk to your neurologist| High fat, non-ketogenic diet| The evidence is too limited to make clear recommendations, but there could be some benefit.|-| Depression and bipolar disorder| C – talk to your specialist| | The evidence is limited, but there could be some benefit.|-| Severe obesity| C – talk to your nutritionist| | The Ketogenic Diet can clearly help with weight loss, the benefits and risks must be carefully weighed.|-| Type 1 diabetes| D – consider | | |-| Autism| D – consider | | |
=What is the Ketogenic Diet?=
The word "ketogenic" literally means that it creates [[Ketones]]. Our bodies produce ketones from fat when carbohydrates become scarce. To trigger ketosis (the production of ketones) we normally have to restrict carbohydrate intake to a very low level. The exact amount of carbohydrate varies by individual, but often it has to be restricted to less than 20g/day. (Normally the amount [[Fiber]] is ignored in the diet, and a figure of [[Net CarbohydrateCarbohydrates]] is are used.) Because the body will convert protein to glucose, it is also necessary to tightly control the intake of protein. Too much protein will prevent ketosis, but to a little will cause malnutrition. Some authors recommend the RDA for protein, while others suggest 0.6 to 1.0 grams per pound of lean body mass. When carbohydrate availability is restricted, the body does not immediately swap over to using fat and ketones, but rather there is a period of adaptation often referred to as [[Ketoadaptation]]. This made last a few weeks, and some people report feeling sluggish during this time. The ketogenic diet entails some potentially serious health risks, so medical supervision is required, along with regular tests and diet supplements. The ketogenic diet is one of the more stringent [[Low Carbohydrate Diets]], and should not be taken lightly. 
=Are Carbohydrates Necessary?=
There are various answers to this, both 'yes' and 'no'. While many cells can burn Ketones instead of Glucose, cells with few or no mitochondria must have glucose. However, protein can be converted to glucose, so while carbohydrate is necessary, it does not have to be consumed in the diet. If no protein is consumed, then the body will cannibalize muscle tissue to provide the required glucose. The only type of carbohydrate intake that could be considered critical for health would be [[Fiber]], which is converted by the digestive bacteria into Short Chain Fatty Acids which are the primary fuel source for some cells such as the lining of the colon.  
=Advantages of the Ketogenic Diet=
* [['''Ketogenic Diet as a Treatment]]'''. The greatest advantage of the ketogenic diet is probably [[Ketogenic Diet as a Treatment| its use for the treatment or management of disease]].
** '''Strong evidence: Epilepsy'''. There is a preponderance of evidence that the ketogenic diet is an effective treatment for epilepsy. I believe that anybody with epilepsy or is a caregiver for someone with epilepsy should discuss this with their doctor.
** '''Limited evidence, but serious disease'''. Cancer, Alzheimer's disease, Parkinson's disease, Amyotropic Lateral Sclerosis (ALS), Schizophrenia, Depression, Bipolar disorder (therefore possibly [[Overtraining Syndrome]]), Type 1 diabetes. While the evidence is somewhat limited, there is a growing body of supporting literature, and these diseases have such a catastrophic impact on life that the ketogenic diet is almost certainly worth investigating. I would encourage anyone with one of these conditions to discuss the ketogenic diet with their doctor.
* '''Muscle Building'''. The ketogenic diet tends to have a protein sparing effect. There are anecdotal reports (myself included) that it is much easier to build muscle on the ketogenic diet.
** Anecdotal suggestion that over-ketosis might cause growth inhibition in children.
** The [[Ketogenic Mechanism of Action]] is probably the ketones levels, so increased protein intake (or [[Net Carbohydrates| Net Carbohydrate]] intake) can impair muscle growth.* '''Altitude'''. There is evidence that the ketogenic diet provides protection against hypoxia, and in this may convey a survival advantage at extreme altitude<ref name="Myles-1976"/>. In addition, it is possible that the ketogenic diet may improve the ability to function at high altitude. My personal experience is that during my [[Altitude Training]], I am able to remain unimpaired while breathing much lower percentages of oxygen.** See "Survival of fasted rats exposed to altitude". 
=Disadvantages of the Ketogenic Diet=
* '''Health Risks'''. There are some serious [[Health Risks of the Ketogenic Diet]]. These can largely be mitigated with care, but anyone considering the Ketogenic Diet should be aware of both the risks and the mitigations.
* '''Adaptation time'''. It can take some weeks to adapt to the ketogenic diet, a process known as [[Ketoadaptation]]. During this time many people report feeling sluggish and the benefits may not be readily apparent. It is unclear how longer you can be out of ketosis without losing your [[Ketoadaptation]], something that is important if you accidentally eat the wrong foods.
* '''Many unknowns'''. While there is a significant body of research on the ketogenic diet and low carbohydrate diets, there are still a large number of unknowns. Our lack of knowledge makes it harder to provide good recommendations, but hopefully this will improve as time progresses.
 =Common pitfallsThe Inuit Diet=This section should list out some The Inuit diet consists almost entirely of animal based foods, with virtually no plant food sources due to their artic location. It is therefore sometimes considered a model of the more common pitfallsKetogenic Diet. However, this diet is not what someone on a western diet would think of as a "meat diet", as the Inuit eat most of the animal, with the meat eaten raw (sometimes frozen) or perhaps provide partly boiled (including the broth), and they consume the blood, liver, etc.<ref name="Sinclair-1953"/>. The Inuit diet is not ketogenic unless they fast for a checklistcouple of days<ref name="Heinbecker-1928"/>, possibly because of the glycogen in the meat<ref name="Ho-1972"/>. Even though the Inuit eat animal parts that are higher in Vitamin C, such as the liver and skin, Vitamin C deficiency is widespread<ref name=" Geraci-1979"/>
=Required Reading=
If you are seriously considering the ketogenic diet, you should read Dr. Kossoff's book as a bare minimum. The other books are worth reading, but I'm not as critical as Kossoff's volume.(The popular book [[Keto Clarity]] is not recommended and should be treated with caution.)
{| class="wikitable"
|- valign="top"
|[[File:KetogenicDietsKossoff.jpg|none|thumb|200px|[ Ketogenic Diets: Treatments for Epilepsy and Other Disorders, by Eric H. Kossoff] is the best all-around book I've come across on the ketogenic diet. It focuses on the diet as a treatment for epilepsy, but touches on other conditions. It has a positive view of the ketogenic diet, but balances this with the caution that comes with being a medical practitioner that has used the diet for many years.]]
|[[File:Art-and-Science-of-Low-Carbohydrate-Living-Book-Cover.jpg|none|thumb|200px|[ The Art and Science of Low Carbohydrate Living] is an easy to read and entertaining look at the ketogenic diet. However, the book is biased in favor of the ketogenic diet, and it does not have a well balanced view that includes a comprehensive review of the risks.]]
|- valign="top"
|[[File:KetogenicMcdonald.jpg|none|thumb|200px|[ The Ketogenic Diet: A Complete Guide for the Dieter and Practitioner] is an interesting book, and while I believe it's worth reading, I find myself unconvinced by the evidence it presents. I think that this book is worth reading, but look Look to Kossoff's book as a better source of information.]]
|[[File:anslowcarbperf.JPG|none|thumb|200px|[ The Art and Science of Low Carbohydrate Performance] is obviously focused on the ketogenic diet for athletes. While it suffers from the same bias as the "The Art and Science of Low Carbohydrate Living", it is highly recommended for any athlete who is considering the ketogenic diet.]]
 =RecommendationsSee Also=This section should provide recommendations based on each individual's probable situation.{{KetoList}}
<ref name="Myles-1976">WS. Myles, Survial of fasted rats exposed to altitude., Can J Physiol Pharmacol, volume 54, issue 6, pages 883-6, Dec 1976, PMID [ 1021222]</ref><ref name="Ho-1972">Ho, Kang-Jey, et al. "Alaskan Arctic Eskimo: responses to a customary high fat diet." The American journal of clinical nutrition 25.8 (1972): 737-745.</ref><ref name="Heinbecker-1928">Heinbecker, Peter. "Studies on the metabolism of Eskimos." Journal of Biological Chemistry 80.2 (1928): 461-475.</ref><ref name="Geraci-1979">Geraci, Joseph R., and Thomas G. Smith. "Vitamin C in the diet of Inuit hunters from Holman, Northwest Territories." Arctic (1979): 135-139.</ref><ref name="Sinclair-1953">Sinclair, H. M. "The diet of Canadian Indians and Eskimos." Proceedings of the Nutrition Society 12.01 (1953): 69-82.</ref><ref name=" Geraci-1979">Geraci, Joseph R., and Thomas G. Smith. "Vitamin C in the diet of Inuit hunters from Holman, Northwest Territories." Arctic (1979): 135-139.</ref>

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