Sir Harold Percival "Harry" Himsworth, KCB, FRS[1] (19 May 1905 – 1 November 1993) was a British scientist, best known for his medical research on diabetes mellitus.
[2] He was born in Huddersfield, West Yorkshire, the son of Joseph Arnold Himsworth and Amy Eliza Barraclough.
[3] He delivered the Goulstonian Lecture at the Royal College of Physicians in 1939 entitled Mechanism of diabetes mellitus He was appointed Professor of Medicine at the University of London and the Secretary of the Medical Research Council (MRC) for the very long period of 1949-1968.
Professor Edwin Gale has noted: He demonstrated that injected insulin produced a greater hypoglycaemic response in individuals treated with the high carbohydrate diet, thus demonstrating that diet could influence insulin sensitivity.
The high carbohydrate diet worked because it allowed the flow of glucose to the tissues to be maintained at a lower head of pressure by making people more sensitive to their own insulin.