When Anderson went on the all meat diet (80% fat, less than 10 grams
carbs per day, all beef) his readings initially went high but then
settled into a more normal range.  After one year the diet was changed to
95% fat and Anderson's readings after one week went to 500.  One week
later, when carbs were increased to 35 grams per day with the
introduction of buttermilk and heavy cream and fat remained at 95%, his
readings went to 800 (after a 20 hour fast).  He then returned to the all
meat diet and his levels came back to normal.

Ray Audette
Author "NeanderThin:A Caveman's Guide to Nutrition"
http://www.sofdesign.com/neander