Seen this on another form about 2 men in the 1930 who ate nothing but meat for a full year.  The doctors measured everything that was then measurable, and it showed that nothing bad happened to the subjects as a result of the diet, not even vitamin deficiencies. They got the idea after observed the Inuit tribe who ate nothing but protien and fats.http://www.jbc.org/content/87/3/651.full.pdf