Researchers say vitamin E might slow the progression of mild-to-moderate Alzheimer's disease -- the first time any treatment has been shown to alter the course of dementia at that stage. In a study of more than 600 older veterans, high doses of the vitamin delayed the decline in daily living skills, such as making meals, getting dressed and holding a conversation, by about six months over a two-year period. Vitamin E did not preserve thinking abilities, though, and it did no good for patients who took it with another Alzheimer's medication. But those taking vitamin E alone required less help...