Catherine had suffered from asthma since childhood – she could not remember a time when these attacks of breathlessness and wheezing did not set in once or twice a week. Skin testing had always been negative and she had simply learned to live with the problem, controlling her symptoms with drugs. Then, in her forties, Catherine began to suffer from frequent headaches and felt very tired. Her doctor could find nothing wrong and suggested that she might like to try an elimination diet to see if this was of any help. Catherine cut out milk, eggs, wheat and citrus fruits, and found that she felt a great deal better. When she retested milk, this brought on a headache within an hour, followed by a severe attack of asthma. On a diet with no milk or milk products her headaches are few and far between. To her great surprise, she is also free from asthma attacks for the first time in her adult life.