This Reuters piece is an excellent example of the sort of medical study that illustrates our paucity of knowledge in the grand scheme of things. The study suggests that consuming antioxidants doesn't protect against neurodegenerative conditions (such as Alzheimer's). The real message, however, is that researchers don't yet understand most of the relationships, biochemistry, and other risk factors involved. Taken alone, the study is a pin pushed into the map of a vast unknown territory. If human biochemistry is colonial America, then progress to date would put us at 1750 or thereabouts. We have established well-explored enclaves, but the road ahead is long.