Nutrition is one of those subjects which comes up every day in general practice—or should do—yet in most undergraduate medical schools it is crowded out by the big clinical specialities and high technology procedures. It is for subjects like nutrition that the British Medical Journal’s ABC series is extremely useful. This book was started when Dr Stephen Lock, previous editor of the BMJ asked me to write a series of weekly articles for an imagined general practitioner, in an unfashionable provincial town who had been taught almost no nutrition at medical school. They now felt the need to use nutrition in the practice, but could.