Dr John Mansfield has been working in the field of food sensitivity since 1976, when he became one of three original British pioneers. In 1978 he was a founder member of the British Society for Allergy and Environmental Medicine and became its President from 1992 to 1995. He gained his medical degree at Guy's Hospital, London, and has worked in both the UK and US.

• Why low-calorie diets don't work in the long term Five examples of people with food sensitivities Understanding food sensitivity as a cause of weight gain The elimination diet Desensitisation to food sensitivities The yeast syndrome Low thyroid production as a cause of weight gain The cholesterol myth and the dangers of low fat diets How refined carbohydrates cause weight gain, diabetes and coronary artery disease The nutritional consequences of eating refined carbohydrates Weight gain, diabetes and coronary artery disease - a man-made disaster Does exercise help weight management? A step-by-step programme to sort out your own weight problems