Trappers discover how a meat-only diet requires fat.
January 1, 1857
"In the winter of 1857, a party of trappers exploring Oregon's Klamath River who came to be stranded "tried the meat of horse, colt and mules, all of which were in a starved condition, and of course not very tender, juicy." They consumed an enormous amount of meat, from five to six pounds per man each day, but "continued to grow weak and thin" until, after twelve days, "we were able to perform but little labor, and were continually craving for fat."
-Nina Teicholz - The Big Fat Surprise - Page 18