> On the other hand, I've been on Cordain's version of this diet for two weeks now
> and have lost about seven pounds (morning, naked, hungry). I believe that's more
> than is supposed to be possible without water loss, but I don't care. I feel
> really good, better than I have for years.

In ketosis? That has high water loss at first.
>
> On the other hand, I work out pretty hard several times a week and I have noticed
> a slight decrease in available energy when I execise, especially at the beginning
> of a session. Has anyone else noticed this? Does it change? Any explanations?

Any big change of diet might do that. Losing that much weight might
too. Make sure you are replacing electrolytes, potassium, calcium, (in
a whisper--even salt).