I finally found the following quotation of the Phinney study on
ketogenic diets and salt supplementation.  Since an all-meat diet
is inevitably ketogenic, it could be relevant.

Todd Moody
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Phinney S.D. et. al. "The human metabolic
response to chronic ketosis without caloric restriction: physical and
biochemical adaptations" Metabolism (1983) 32: 757-768.

"The first (and probably the most important) points is control of
the salt intake of the subjects.  Whereas other investigators
have withheld, not controlled or not specified adequate sodium
intake, in this study subjects were encouraged to take salt and
bouillon on a quantity sufficient to maintain a daily urinary
sodium output of 200 mEq while on the {eucaloric ketogenic diet}.
This quantity, representing between 4 and 5 g daily, is not
excessive relative to the average American intake.  It is
interesting to note that the subjects had to be encouraged to
take salt in quantities beyond their perceived need (taste) to
maximally limit deficiency symptoms of lethargy or fatigue during
exercise.  This level of sodium supplementation was well
tolerated by the subjects and appears to have been a critical
factor in avoiding the nausea, fatigue and orthostatic symptoms
that appear to have interefered with previous studies using
low-carbohdyate eucaloric diets."