San Bernardino, November 4, 1917

(from Wikipedia:

Hoover established set days for people to avoid eating specified foods and save them for soldiers’ rations: meatless Mondays, wheatless Wednesdays, and “when in doubt, eat potatoes”. This program helped reduce consumption of foodstuffs needed overseas and avoided rationing at home. It was dubbed “Hooverizing” by government publicists, in spite of Hoover’s continual orders that publicity should not mention him by name.)