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* '''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.
=The Inuit Diet=
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 Ketogenic 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 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 couple 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.)
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<references>
<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 [http://www.ncbi.nlm.nih.gov/pubmed/1021222 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>
</references>