Dr Meg Arroll (PhD, CPsychol, CSci, AFBPsS, FHEA, MISCP) is a psychologist and author who specialises in health, particularly the relationship between stress, weight and fatigue. She is a Chartered Psychologist with the British Psychological Society, an Associate Fellow of the British Psychological Society, a Chartered Scientist with the Science Council, a Fellow of the Higher Education Academy and a member of the International Society for Coaching Psychology and the Royal Society of Medicine.Louise Atkinson is a freelance journalist/writer/editor with a strong specialism in diet, nutrition, exercise and health. She is the Daily Mail’s ‘go to’ diet expert, has an encyclopaedic knowledge of all diet plans - good and bad - and has spent 30 years writing for a wide variety of major national magazines on popular subjects including health, lifestyle and diets.