Can you site your sources? Was this a low-fat-zero-carb diet? That's the problem with Cordain is he advocates lean meat. Bad, very bad.
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Of course, there are many other issues re zero-carb, cooked or otherwise, such as the inevitable drastic drop in physical performance re sports,(some anecdotal reports re stress of no-carb diets on the thyroid), and other issues.
Geoff