Scottish non-fiction writers

Archibald Joseph Cronin (19 July 1896 – 6 January 1981), known as A. J. Cronin, was a Scottish physician and novelist. His best-known novel is The Citadel (1937), about a Scottish doctor who serves in a Welsh mining village before achieving success in London, where he becomes disillusioned about the venality and incompetence of some doctors. Cronin knew both areas, as a medical inspector of mines and as a doctor in Harley Street. The book exposed unfairness and malpractice in British medicine and helped to inspire the National Health Service. The Stars Look Down, set in the North East of England, is another of his best-selling novels inspired by his work among miners. Both novels have been filmed, as have Hatter's Castle, The Keys of the Kingdom and The Green Years. His 1935 novella Country Doctor inspired a long-running BBC radio and TV series, Dr. Finlay's Casebook (1962–1971), set in the 1920s. There was a follow-up series in 1993–1996.

Gillian McKeith (born 28 September 1959) is a Scottish television personality and writer. She is known for her promotion of various pseudoscientific ideas about health and nutrition. She is the former host of Channel 4's You Are What You Eat (2004–2006), Granada Television's Dr Gillian McKeith's Feel Fab Forever (2009–2010), and W Network's Eat Yourself Sexy (2010). In 2008, McKeith regularly appeared on the E4 health show Supersize vs Superskinny, and in 2010, she was a contestant on the tenth series of the ITV show I'm a Celebrity...Get Me Out of Here!
Numerous practices supported by McKeith are pseudoscience not supported by scientific research, such as the detox diet, colonic irrigation, and her claims that examining the tongue and stool samples can be used to identify ailments and dietary needs. McKeith has no qualifications in nutrition or medicine from accredited institutions, and in 2007 agreed with the Advertising Standards Authority to stop using the title "Doctor".McKeith has written several books about nutrition, including You Are What You Eat (2004), which sold more than two million copies, and Dr Gillian McKeith's Ultimate Health Plan (2006). The validity of her approach and the safety of her recommendations have been strongly criticised by health professionals. She faced criticism during the COVID-19 pandemic for promoting COVID-19 misinformation and anti-vaccine views, and was described as a conspiracy theorist.

Bertie Charles Forbes (; May 14, 1880 – May 6, 1954) was a Scottish-American financial journalist and author who founded Forbes magazine.

John Henry Mackay (February 6, 1864 – May 16, 1933) was a Scottish-German egoist anarchist, thinker and writer. Born in Scotland and raised in Germany, Mackay was the author of Die Anarchisten (The Anarchists, 1891) and Der Freiheitsucher (The Searcher for Freedom, 1921).
Later in life, under the pseudonym Sagitta, he became an advocate for homosexual love between men and boys.