I disagree. It's quite easy to work out which foods can make one last longer. 
For example, the Native Americans of previous centuries would deliberately 
stock up with pemmican( meat plus lots of fat) for long journeys. They were 
also acutely aware of the condition of rabbit-starvation, which occurs when 
you have too much protein and almost no  fats(or carbs) - the result was that 
they always made sure to get hold of enough  fatty meats, not just for taste 
reasons.

Geoff

On Wed, 14 May 2008 17:08:45 -0500, Robert Kesterson 
<[log in to unmask]> wrote:

>On Wed, 14 May 2008 16:53:45 -0500, Geoffrey Purcell
><[log in to unmask]> wrote:
>>...
>> since meats are more nutrient-dense than plants, it makes sense for
>> hunter-gatherers to depend mainly on meats, as a result.
>
>Paleo man probably didn't know much about which foods were more
>nutrient-dense than others.  He did know which ones he could obtain
>easily, which were likely to increase or decrease sickness, and which were
>more tasty or satisfying.  In that regard, paleo man and modern man don't
>differ much, it's just that modern man isn't as discerning about what
>increases or decreases sickness.
>
>--
>   Robert Kesterson
>   [log in to unmask]