Hulsizer worked as a dietitian at hospitals in Massachusetts early in her career. She was one of the charter members of the
American Dietetic Association when it was founded in 1917. During World War I, she joined the
Peter Bent Brigham Hospital Unit, serving as a dietitian in
Étaples and
Boulogne-sur-Mer, France, with the
British Expeditionary Force from May 1917 to the end of 1918, and then with the
American Expeditionary Forces. She was decorated by the British and French for her wartime service. "We draw rations every morning of bacon, rice, onions, potatoes, tinned meat, milk, cocoa, jam, oleomargarine, pork and beans, sugar, salt, tea, cheese, bread, mustard, pepper, pickles, and coal and ice when they have it. I feed about one hundred and twenty people," she wrote in an account of her responsibilities. For a brief time after the war, she worked at the City Hospital in
Buffalo, New York. From 1921 to 1925, Hulsizer worked at the
Barnes-Jewish Hospital in
St. Louis, Missouri, as head dietitian. She was active in the
League of Women Voters and
Washington University Woman's Club. ==Personal life and legacy==