Editing John Macleod (physiologist) (section)

===Later years===
Macleod returned to Scotland in 1928 to become [[Regius Professor of Physiology (Aberdeen)|Regius Professor of Physiology]] at the University of Aberdeen (in succession to his former teacher, [[John Alexander MacWilliam]] who retired in 1927) and later Dean of the University of Aberdeen Medical Faculty. Between 1929 and 1933 he was also a member of the Medical Research Council.

Macleod did not continue to work on insulin, but he remained active as a researcher, lecturer and author. His last major contribution was a proof that the [[central nervous system]] does have an important role in maintaining carbohydrate metabolism balance, as was his original hypothesis. His theory about conversion of [[fat]]s into carbohydrates remained unproven, despite his provision of several indirect proofs.<ref name="Bliss1989"/> He devoted his spare time to golf, motorcycling and painting. 

He was married to Mary W. McWalter, but they never had children. He died in 1935 in Aberdeen after several years of suffering from arthritis,<ref>{{cite web |url=http://nobelprize.org/nobel_prizes/medicine/laureates/1923/macleod.html |title=John Macleod – Biography |year=1923 |publisher=Nobel Foundation |access-date=2011-03-30}}</ref> despite which he remained active almost until his death. In 1933 he made a lecture tour of the US, and in 1934 he published the 7th edition of his book ''Physiology and Biochemistry in Modern Medicine''.<ref name="Cathcart1935"/>