Vocation : Medical : Nutritionist

John Boyd Orr, 1st Baron Boyd-Orr, (23 September 1880 – 25 June 1971), styled Sir John Boyd Orr from 1935 to 1949, was a Scottish teacher, medical doctor, biologist, nutritional physiologist, politician, businessman and farmer who was awarded the Nobel Peace Prize for his scientific research into nutrition and his work as the first Director-General of the United Nations Food and Agriculture Organization (FAO).
He was the co-founder and the first President (1960–1971) of the World Academy of Art and Science (WAAS). In 1945, he was elected President of the National Peace Council and was President of the World Union of Peace Organisations and the World Movement for World Federal Government.

Kaare Reidar Norum (24 December 1932 – 22 November 2019) was a Norwegian physician and professor of nutrition. He served as rector of the University of Oslo from 1999 to 2001.
He was born in Oslo. He was hired as a docent at the University of Oslo in 1969 and advanced to professor in 1972. He served as vice dean of the Faculty of Medicine from 1983 to 1985, dean from 1986 to 1988 and rector from 1999 to 2001.He was a fellow of the Norwegian Academy of Science and Letters since 1986; Commander of the Order of St. Olav in 1999 (Knight since 1992) and Commander of the Order of the Polar Star.Norum became a member of Statens ernæringsråd in 1971 and chaired the council several times. He appeared numerous times in the Norwegian Broadcasting Corporation, speaking on topics within nutrition, notably together with Ingrid Espelid Hovig.

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.

Jane Ellen Brody (born May 19, 1941) is an American journalist principally covering science and nutrition. She wrote for The New York Times as its weekly "Personal Health" columnist from 1976 to 2022. Her column was syndicated nationwide, and she wrote several books on health. She was called the "High Priestess of Health" by Time magazine in 2008.

Benjamin Gayelord Hauser (May 17, 1895 - December 26, 1984), popularly known as Gayelord Hauser, was an American nutritionist and self-help writer, who promoted the 'natural way of eating' during the mid-20th century. He promoted foods rich in vitamin B and discouraged consumption of sugar and white flour. He rose to fame as a self-help author, popular on the lecture and social circuits, and was nutritional advisor to many celebrities.
Hauser was supported by many film stars but was often in conflict with the medical community. He promised people they could add years to their life by eating five "wonder foods": blackstrap molasses, brewer's yeast, skimmed milk, wheat germ and yogurt. He was criticized as a "food faddist" and his dieting ideas were described by medical doctors as pseudoscientific and quackery.