What role did Herbert Hoover play in WWI?

Herbert Hoover was the 31st President of the United States, serving from 1929 to 1933. At the outbreak of World War I, Hoover worked as a mining consultant and financier based in London. That year, Hoover was appointed the chair of a committee of London-based American businessmen who organized the return of Americans trapped in Europe as a result of the war. Hoover established a separate committee, the Commission for Relief in Belgium (CRB) in response to the food crisis caused by the German invasion. Private donations and government grants facilitated the CRB becoming an independent public relief organization with its own railroads, navy, factories, and mills.
After the United States declared war on Germany in 1917, President Woodrow Wilson appointed Hoover to head the US Food Administration. Hoover's responsibility was to support the nation's food requirements during the war. World War I had caused a global food crisis, resulting in a worldwide increase in food prices and mass-starvation in Europe. Hoover was responsible for preventing food shortages and stabilizing food prices in America—while the main objective of his position was to provide supplies to allied countries. Hoover was against the concept of rationing and instead set days when people were to avoid eating certain foods that were part of soldiers' rations.