Pseudoscientific diet advocates

John Steven "Jay" Kordich (August 27, 1923 – May 27, 2017) was an American author and advocate of juicing and juice fasting. Kordich was best known as the "Juiceman" and the "Father of Juicing" in the United States.

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.

Luigi Di Bella (17 July 1912 in Linguaglossa – 1 July 2003 in Modena) was an Italian medical doctor and physiology professor. In the late 1980s, he created a purported treatment known as "Di Bella therapy" for cancer that precipitated an international controversy.
Studies demonstrated that Di Bella's therapy for cancer is totally ineffective. Medical experts consider his cancer therapy dangerous and unscientific.

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.