Knowra Elmer McCollum Elmer McCollum Elmer McCollum (1879–1967) was an American biochemist whose animal-feeding experiments helped establish the existence of essential nutrients and identify vitamins A and D.
Marguerite Davis : An American nutrition researcher who collaborated with McCollum on experiments identifying fat-soluble nutrients. She co-authored the 1913 report that described a growth-promoting factor in butterfat.
Rat-feeding experiments : Experiments that compare animal growth and health on diets with controlled ingredients. McCollum used rats to test whether specific food fractions supported growth.
University of Kansas : A public research university in Lawrence, Kansas, founded in 1865. McCollum earned his undergraduate degree there before pursuing graduate study in agricultural chemistry.
Vitamin fortification : The addition of vitamins to foods to improve nutritional value or prevent deficiencies. Identification of vitamins helped make adding defined nutrients to staple foods scientifically possible.
Thomas Burr Osborne : An American chemist who studied the proteins and nutritional value of seeds with Lafayette Mendel. His independent experiments with McCollum helped establish the need for dietary factors beyond protein.
Essential nutrient : A substance an organism must obtain from its environment because it cannot synthesize enough to meet its needs. McCollum’s experiments helped establish that ordinary calories and protein could not sustain growth alone.
Yale University : A private research university in New Haven, Connecticut, founded in 1701. McCollum completed doctoral training in agricultural chemistry at Yale in 1906.
Food fortification with vitamin D : The addition of vitamin D to foods, commonly milk, to reduce deficiency and rickets. McCollum’s vitamin D research informed later efforts to prevent rickets through fortified foods.
Lafayette Mendel : An American biochemist whose research on nutrition and growth helped establish the role of dietary factors. His Yale research independently investigated fat-soluble nutrients and overlapped with McCollum’s findings.
Vitamin A : A fat-soluble group of compounds needed for vision, immune function, growth, and development. McCollum’s feeding studies helped identify a growth-supporting factor in butterfat and egg yolk, later called vitamin A.
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