John Nichols graduated with an MB ChB from Liverpool Medical School in 1967, before spending a year with Dr Ian Watson at Shere Surgery near Guildford in Surrey. They published a joint paper on measles immunity in 1975. Since then, Nichols has conducted research into public awareness of health hazards, trace elements and fertility, exercise on prescription, folic acid, smoking cessation and probiotics. In 1999, he embarked on a Master’s degree in Nutritional Medicine at the University of Surrey, UK. He spent 42 years as a Guildford GP, before retiring in 2015. He is the author of Nutrition and Science: A Darwinian Perspective on Nutritional Medicine (2019). He is still involved in academia as a Visiting Research Fellow at the University of Surrey, and is active as a Fellow of the Royal College of General Practitioners.