In 1921 she became the research director at the
Battle Creek Sanitarium and taught in
John Harvey Kellogg's School of Dietetics. During her time there, her research expertise was called upon by
Wilfred Grenfell to conduct research on behalf of the Grenfell Mission in Newfoundland and Labrador. Along with Margery and Catherine Vaughn, they conducted a year-long survey in 1929 of gardens and livestock to determine nutritional problems that coastal fishing towns were having. She found that many families were lacking minerals and vitamins from their overall calorie count. She later became the Head of the Department of Food and Nutrition and the Dean of the School of Home Economics (1947-1960).
War years In 1940, the National Research Council, wanting to predict nutritional needs for the military and civilians set up the Food and Nutrition Committee. During World War II, she was principal nutritionist for the Office of Defense, Health and Welfare Services and chief nutritionist for the State Department Office of Foreign Relief and Rehabilitation (1943-1944). Working with Setsuko Santo, they determined in their first survey in 1960 that the children's stature was well below that of the national Hokkaido average based on nutritional disadvantages like lacking protein and vitamin A. He prescribed his patients individualized diets to help cure their ailments and also experimented with meat substitutes. Helen Mitchell was publicly critical of
fad diets, calling out the unscientific nature of them. She was particularly critical of the
Dr. Hey diet which said that acidic and alkaline foods could not be digested together, she considered these claims irrational and believed they discredited the field of nutrition. Mitchell thought that fad diets undermine the legitimate contributions to the field of nutrition by scientists. ==Selected publications==