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Exercise
Some critics argue that low-carbohydrate diets can inherently cause weakness or fatigue[109] giving rise to the occasional assumption that low-carbohydrate dieting cannot involve an exercise regimen. Advocates of low-carbohydrate diets generally dispute any suggestion that such diets cause weakness or exhaustion (except in the first several days as the body adjusts) and indeed most highly recommend exercise as part of a healthy lifestyle.[108][110] There is a large body of evidence stretching back to the 1880s that shows that physical performance is not negatively affected by ketogenic diets once a person has been acclimatized to such a diet. Arctic cultures such as the Inuit and African cultures such as the Masai Tribesmen lead physically demanding lives in some of the harshest climates on Earth and yet consume a diet almost completely devoid of carbohydrate. However, studies also indicate that while a low carbohydrate diet will not reduce endurance performance after adapting, they will probably deteriorate anaerobic performance such as strength training or sprint running because these processes rely on glycogen for fuel.[110] A living proof of the fact that a ketogenic diet indeed can be combined with outstanding achievements in physical exercise is the Olympic biathlon gold medalist Björn Ferry, who won his gold medal after about 6 months on a low-carbohydrate-high-fat diet.[111]
http://en.wikipedia.org/wiki/Low-carbohydrate_diet
Exercise
Some critics argue that low-carbohydrate diets can inherently cause weakness or fatigue[109] giving rise to the occasional assumption that low-carbohydrate dieting cannot involve an exercise regimen. Advocates of low-carbohydrate diets generally dispute any suggestion that such diets cause weakness or exhaustion (except in the first several days as the body adjusts) and indeed most highly recommend exercise as part of a healthy lifestyle.[108][110] There is a large body of evidence stretching back to the 1880s that shows that physical performance is not negatively affected by ketogenic diets once a person has been acclimatized to such a diet. Arctic cultures such as the Inuit and African cultures such as the Masai Tribesmen lead physically demanding lives in some of the harshest climates on Earth and yet consume a diet almost completely devoid of carbohydrate. However, studies also indicate that while a low carbohydrate diet will not reduce endurance performance after adapting, they will probably deteriorate anaerobic performance such as strength training or sprint running because these processes rely on glycogen for fuel.[110] A living proof of the fact that a ketogenic diet indeed can be combined with outstanding achievements in physical exercise is the Olympic biathlon gold medalist Björn Ferry, who won his gold medal after about 6 months on a low-carbohydrate-high-fat diet.[111]
http://en.wikipedia.org/wiki/Low-carbohydrate_diet
