Jeff Volek - Low Carbohydrate Performance
http://www.artandscienceoflowcarb.com/
http://www.amazon.com/The-Art-Scienc.../dp/0983490716
Protein. Necessary, But In Moderation
Too little or too much protein can be problematic in the keto-adapted state. Aim for a protein intake between 0.6 to 1.0 grams per pound of lean body mass. Rather than consume large portions of meats or other protein foods, focus on small to moderate protein portions and combine them with generous portions of good sources of fat (e.g., sauces, butter,olive oil).
That said, however, significantly over-consuming protein can be problematic because some of these extra amino acids can be converted to glucose in the body, raising insulin levels, and thus driving down ketones and suppressing fat burning. Even if your goal is gaining muscle, there is a limit to how much new muscle protein can be added each day, and under most circumstances, this amount is relatively small. Over consuming protein beyond the level that allows maximum anabolism in skeletal muscle thus puts a burden on the body to get rid of the extra nitrogen. Since protein is not a particularly efficient fuel source and for the reasons mentioned above, it therefore makes little sense to consume it in excess. For all these reasons, we recommend aiming for an intake in the range of 0.6 to 1.0 grams per pound lean body mass.
Lyle McDonald - The Ketogenic Diet
http://www.bodyrecomposition.com/the-ketogenic-diet/
http://www.amazon.com/The-Ketogenic-.../dp/0967145600
While an easy solution is to simply eat as much protein as possible, too much protein can prevent ketosis as well, disrupting the adaptations which ketogenic dieters seek. Therefore, protein intake must fall within a narrow range: high enough to prevent muscle loss but low enough that ketosis is not disrupted [...] A protein intake of 0.9 grams of protein/lb of total bodyweight is an appropriate protein level to start at (for individuals involved in resistance exercise) [...] After the first few weeks of ketosis, protein requirements will go down as the body reduces its need for glucose.
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