Environmental risk factors for Alzheimer's disease

To the Editors: My interest in the Canadian study of risk factors for Alzheimer's disease [1] stems from studies over the past 15 years of environmental factors that may be linked to the development or aggravation of various neurologic disorders. In 1987, I first reported ``The Environmental Assessment of Neurologic Disease.'' [2] Fifty-six patients were the subjects of the study. Diagnostic categories included headaches, seizures, multiple sclerosis, dementia, parkinsonism, lumbar radiculitis (with and without spinal stenosis), peripheral neuritis, …