Just making this up as I go...the exercise stamina thing regarding Atkins does make sense. I'm a big Atkins advocate, so I'm not showing bias here. I personally haven't had this happen to me.
But, let's see...
A low-carb diet should produce a stable, predictable blood sugar level. However, during exercise, the body looks for carbs as its primary energy source (quick reserve energy). If you are pulling energy exclusively from glycogen stores (stored fat), it is not nearly as accessible as the alternative. Thus, a perceived lack of stamina, as you don't have any high-octane fuel in your system.
(I don't remember this really well, but I'd also bet that when your body is trying to scrounge energy while low on oxygen reserves during exercise, that converting protein and fat into glycogen is much more difficult)
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Wait a minute! Where am I, and why am I in this handbasket?
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