Supplements derived from apple skins, red wine and turmeric might someday help slow the onset and progression of Alzheimer's and related diseases, according to accumulating evidence. The details are complicated and still a matter of debate. But the scientists involved are basing their strategy on what they say is a new way of thinking about Alzheimer's. In their view, a group of chemicals called type-2 alkenes, which are widespread in both the environment and the brains of Alzheimer's patients, act as major drivers of the disease.