Art, you may want to review the referenced papers on the all-meat diet
again.  The subjects were not kept locked in prison conditions, they
exercised on a regular basis, and after the first month or so Stefansson
himself travelled freely about the country, while always in the company of
an observer and under strict oath to eat nothing but meat.

The purpose of this experiment was (first and foremost) to demonstrate
empirically that it was possible to survive with no major ill effects on an
all-meat diet, and in that they succeeded quite well.  The common
predictions at the time were that anyone who tried this would be horribly
crippled by gout or acidosis or kidney failure or scurvy or other problems,
including possible ill mental effects.  Some had called Stefansson and
others liars for suggesting that the Inuit actually survived this way.
However, after a year there were no serious ill effects (mental or
physical) except elevated cholesterol.  Long-term negative effects were not
examined, although Stefansson is known to have lived into his 80s.

Beyond just demonstrating that it was possible for humans to survive and be
healthy, all the experimenters did was try their best to document various
aspects of the subjects' health while on the diet. Making much more out of
this experiment would be hazardous.

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"What can be done with fewer assumptions is done in vain with more."
                                         William of Occam 1285-1347