Roy Mack’s milk-diet tour

Roy Mack set off from New York on May 2, 1939, intending to walk to San Francisco. To make this more of a challenge, he decided to do this while living on a diet of only milk — about six quarts of it a day. He said he wanted to "prove you can live on milk." The media dubbed him the "human milk bottle."

By August he had reached Oklahoma City and had also lost 10 pounds in weight. He maintained this was due to all the exercise, not his milk diet.

I have no idea if he ever did reach San Francisco, because I can't find any news reports about him after Oklahoma City. Perhaps the milk diet got the better of him.

Pittsburgh Press - June 3, 1939