Some people say it about prawns, others find it with strawberries, but just supposing the food we eat every day was causing depression, migraine, rheumatoid arthritis or one of many other common conditions. Some doctors think that by recognising the signs and changing our diet, we could feel better, be healthier ... and halve the cost of the NHS. Anne Brown talks to Dr John Mansfield , one of the clinical ecologists who has put everything from wheat to water under scrutiny to try to solve the problem we swallow with relish ... food allergies.
Producer JOCK GALLAGHER BBC Birmingham