How was Christiaan Eijkman awarded the Noble Prize in Physiology or Medicine?

Name: Christiaan Eijkman.
Country: Netherlands.
Date of Birth: 11 August 1858.
Died: 5 November 1930.
Education: University of Amsterdam.
Subjects Of Study: Beriberi deficiency disease.
Known as:  Beriberi, vitamins.
Noble Prize Year: Nobel Prize for Peace in 1929, for his discovery of the antineuritic vitamin.